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<?xml version="1.0" ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>check_postgres.pl - a Postgres monitoring script for Nagios, MRTG, Cacti, and others</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
</head>
<body style="background-color: white">
<!-- INDEX BEGIN -->
<div name="index">
<p><a name="__index__"></a></p>
<ul>
<li><a href="#name">NAME</a></li>
<li><a href="#synopsis">SYNOPSIS</a></li>
<li><a href="#description">DESCRIPTION</a></li>
<ul>
<li><a href="#output_modes">Output Modes</a></li>
<ul>
<li><a href="#nagios_output">Nagios output</a></li>
<li><a href="#mrtg_output">MRTG output</a></li>
<li><a href="#simple_output">Simple output</a></li>
<li><a href="#cacti_output">Cacti output</a></li>
</ul>
</ul>
<li><a href="#database_connection_options">DATABASE CONNECTION OPTIONS</a></li>
<li><a href="#other_options">OTHER OPTIONS</a></li>
<li><a href="#actions">ACTIONS</a></li>
<ul>
<li><a href="#archive_ready"><strong>archive_ready</strong></a></li>
<li><a href="#autovac_freeze"><strong>autovac_freeze</strong></a></li>
<li><a href="#backends"><strong>backends</strong></a></li>
<li><a href="#bloat"><strong>bloat</strong></a></li>
<li><a href="#checkpoint"><strong>checkpoint</strong></a></li>
<li><a href="#cluster_id"><strong>cluster_id</strong></a></li>
<li><a href="#commitratio"><strong>commitratio</strong></a></li>
<li><a href="#connection"><strong>connection</strong></a></li>
<li><a href="#custom_query"><strong>custom_query</strong></a></li>
<li><a href="#database_size"><strong>database_size</strong></a></li>
<li><a href="#dbstats"><strong>dbstats</strong></a></li>
<li><a href="#disabled_triggers"><strong>disabled_triggers</strong></a></li>
<li><a href="#disk_space"><strong>disk_space</strong></a></li>
<li><a href="#fsm_pages"><strong>fsm_pages</strong></a></li>
<li><a href="#fsm_relations"><strong>fsm_relations</strong></a></li>
<li><a href="#hitratio"><strong>hitratio</strong></a></li>
<li><a href="#hot_standby_delay"><strong>hot_standby_delay</strong></a></li>
<li><a href="#index_size"><strong>index_size</strong></a></li>
<li><a href="#table_size"><strong>table_size</strong></a></li>
<li><a href="#relation_size"><strong>relation_size</strong></a></li>
<li><a href="#last_analyze"><strong>last_analyze</strong></a></li>
<li><a href="#last_vacuum"><strong>last_vacuum</strong></a></li>
<li><a href="#last_autoanalyze"><strong>last_autoanalyze</strong></a></li>
<li><a href="#last_autovacuum"><strong>last_autovacuum</strong></a></li>
<li><a href="#listener"><strong>listener</strong></a></li>
<li><a href="#locks"><strong>locks</strong></a></li>
<li><a href="#logfile"><strong>logfile</strong></a></li>
<li><a href="#new_version_bc"><strong>new_version_bc</strong></a></li>
<li><a href="#new_version_box"><strong>new_version_box</strong></a></li>
<li><a href="#new_version_cp"><strong>new_version_cp</strong></a></li>
<li><a href="#new_version_pg"><strong>new_version_pg</strong></a></li>
<li><a href="#new_version_tnm"><strong>new_version_tnm</strong></a></li>
<li><a href="#pgb_pool_cl_active"><strong>pgb_pool_cl_active</strong></a></li>
<li><a href="#pgb_pool_cl_waiting"><strong>pgb_pool_cl_waiting</strong></a></li>
<li><a href="#pgb_pool_sv_active"><strong>pgb_pool_sv_active</strong></a></li>
<li><a href="#pgb_pool_sv_idle"><strong>pgb_pool_sv_idle</strong></a></li>
<li><a href="#pgb_pool_sv_used"><strong>pgb_pool_sv_used</strong></a></li>
<li><a href="#pgb_pool_sv_tested"><strong>pgb_pool_sv_tested</strong></a></li>
<li><a href="#pgb_pool_sv_login"><strong>pgb_pool_sv_login</strong></a></li>
<li><a href="#pgb_pool_maxwait"><strong>pgb_pool_maxwait</strong></a></li>
<li><a href="#pgbouncer_backends"><strong>pgbouncer_backends</strong></a></li>
<li><a href="#pgbouncer_checksum"><strong>pgbouncer_checksum</strong></a></li>
<li><a href="#pgagent_jobs"><strong>pgagent_jobs</strong></a></li>
<li><a href="#prepared_txns"><strong>prepared_txns</strong></a></li>
<li><a href="#query_runtime"><strong>query_runtime</strong></a></li>
<li><a href="#query_time"><strong>query_time</strong></a></li>
<li><a href="#replicate_row"><strong>replicate_row</strong></a></li>
<li><a href="#same_schema"><strong>same_schema</strong></a></li>
<li><a href="#sequence"><strong>sequence</strong></a></li>
<li><a href="#settings_checksum"><strong>settings_checksum</strong></a></li>
<li><a href="#slony_status"><strong>slony_status</strong></a></li>
<li><a href="#timesync"><strong>timesync</strong></a></li>
<li><a href="#txn_idle"><strong>txn_idle</strong></a></li>
<li><a href="#txn_time"><strong>txn_time</strong></a></li>
<li><a href="#txn_wraparound"><strong>txn_wraparound</strong></a></li>
<li><a href="#version"><strong>version</strong></a></li>
<li><a href="#wal_files"><strong>wal_files</strong></a></li>
<li><a href="#rebuild_symlinks"><strong>rebuild_symlinks</strong></a></li>
<li><a href="#rebuild_symlinks_force"><strong>rebuild_symlinks_force</strong></a></li>
</ul>
<li><a href="#basic_filtering">BASIC FILTERING</a></li>
<li><a href="#user_name_filtering">USER NAME FILTERING</a></li>
<li><a href="#test_mode">TEST MODE</a></li>
<li><a href="#files">FILES</a></li>
<li><a href="#environment_variables">ENVIRONMENT VARIABLES</a></li>
<li><a href="#tips_and_tricks">TIPS AND TRICKS</a></li>
<li><a href="#dependencies">DEPENDENCIES</a></li>
<li><a href="#development">DEVELOPMENT</a></li>
<li><a href="#mailing_list">MAILING LIST</a></li>
<li><a href="#history">HISTORY</a></li>
<li><a href="#bugs_and_limitations">BUGS AND LIMITATIONS</a></li>
<li><a href="#author">AUTHOR</a></li>
<li><a href="#nagios_examples">NAGIOS EXAMPLES</a></li>
<li><a href="#license_and_copyright">LICENSE AND COPYRIGHT</a></li>
</ul>
<hr name="index" />
</div>
<!-- INDEX END -->
<p>
</p>
<hr />
<h1><a name="name">NAME</a></h1>
<p><strong>check_postgres.pl</strong> - a Postgres monitoring script for Nagios, MRTG, Cacti, and others</p>
<p>This documents describes check_postgres.pl version 2.21.0</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
## Create all symlinks
check_postgres.pl --symlinks</pre>
<pre>
## Check connection to Postgres database 'pluto':
check_postgres.pl --action=connection --db=pluto</pre>
<pre>
## Same things, but using the symlink
check_postgres_connection --db=pluto</pre>
<pre>
## Warn if > 100 locks, critical if > 200, or > 20 exclusive
check_postgres_locks --warning=100 --critical="total=200:exclusive=20"</pre>
<pre>
## Show the current number of idle connections on port 6543:
check_postgres_txn_idle --port=6543 --output=simple</pre>
<pre>
## There are many other actions and options, please keep reading.</pre>
<pre>
The latest news and documentation can always be found at:
<a href="http://bucardo.org/check_postgres/">http://bucardo.org/check_postgres/</a></pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p>check_postgres.pl is a Perl script that runs many different tests against
one or more Postgres databases. It uses the psql program to gather the
information, and outputs the results in one of three formats: Nagios, MRTG,
or simple.</p>
<p>
</p>
<h2><a name="output_modes">Output Modes</a></h2>
<p>The output can be changed by use of the <code>--output</code> option. The default output
is nagios, although this can be changed at the top of the script if you wish. The
current option choices are <strong>nagios</strong>, <strong>mrtg</strong>, and <strong>simple</strong>. To avoid having to
enter the output argument each time, the type of output is automatically set
if no --output argument is given, and if the current directory has one of the
output options in its name. For example, creating a directory named mrtg and
populating it with symlinks via the <em>--symlinks</em> argument would ensure that
any actions run from that directory will always default to an output of "mrtg"
As a shortcut for --output=simple, you can enter --simple, which also overrides
the directory naming trick.</p>
<p>
</p>
<h3><a name="nagios_output">Nagios output</a></h3>
<p>The default output format is for Nagios, which is a single line of information, along
with four specific exit codes:</p>
<ol>
<li><strong><a name="ok" class="item">(OK)</a></strong>
</li>
<li><strong><a name="warning" class="item">(WARNING)</a></strong>
</li>
<li><strong><a name="critical" class="item">(CRITICAL)</a></strong>
</li>
<li><strong><a name="unknown" class="item">(UNKNOWN)</a></strong>
</li>
</ol>
<p>The output line is one of the words above, a colon, and then a short description of what
was measured. Additional statistics information, as well as the total time the command
took, can be output as well: see the documentation on the arguments
<em><a href="#showperf_val">--showperf</a></em>,
<em><a href="#perflimit_i">--perflimit</a></em>, and
<em><a href="#showtime_val">--showtime</a></em>.</p>
<p>
</p>
<h3><a name="mrtg_output">MRTG output</a></h3>
<p>The MRTG output is four lines, with the first line always giving a single number of importance.
When possible, this number represents an actual value such as a number of bytes, but it
may also be a 1 or a 0 for actions that only return "true" or "false", such as check_postgres_version.
The second line is an additional stat and is only used for some actions. The third line indicates
an "uptime" and is not used. The fourth line is a description and usually indicates the name of
the database the stat from the first line was pulled from, but may be different depending on the
action.</p>
<p>Some actions accept an optional <em>--mrtg</em> argument to further control the output.</p>
<p>See the documentation on each action for details on the exact MRTG output for each one.</p>
<p>
</p>
<h3><a name="simple_output">Simple output</a></h3>
<p>The simple output is simply a truncated version of the MRTG one, and simply returns the first number
and nothing else. This is very useful when you just want to check the state of something, regardless
of any threshold. You can transform the numeric output by appending KB, MB, GB, TB, or EB to the output
argument, for example:</p>
<pre>
--output=simple,MB</pre>
<p>
</p>
<h3><a name="cacti_output">Cacti output</a></h3>
<p>The Cacti output consists of one or more items on the same line, with a simple name, a colon, and
then a number. At the moment, the only action with explicit Cacti output is 'dbstats', and using
the --output option is not needed in this case, as Cacti is the only output for this action. For many
other actions, using --simple is enough to make Cacti happy.</p>
<p>
</p>
<hr />
<h1><a name="database_connection_options">DATABASE CONNECTION OPTIONS</a></h1>
<p>All actions accept a common set of database options.</p>
<dl>
<dt><strong><a name="h_name_or_host_name" class="item"><strong>-H NAME</strong> or <strong>--host=NAME</strong></a></strong></dt>
<dd>
<p>Connect to the host indicated by NAME. Can be a comma-separated list of names. Multiple host arguments
are allowed. If no host is given, defaults to the <code>PGHOST</code> environment variable or no host at all
(which indicates using a local Unix socket). You may also use "--dbhost".</p>
</dd>
<dt><strong><a name="p_port_or_port_port" class="item"><strong>-p PORT</strong> or <strong>--port=PORT</strong></a></strong></dt>
<dd>
<p>Connects using the specified PORT number. Can be a comma-separated list of port numbers, and multiple
port arguments are allowed. If no port number is given, defaults to the <code>PGPORT</code> environment variable. If
that is not set, it defaults to 5432. You may also use "--dbport"</p>
</dd>
<dt><strong><a name="db_name_or_dbname_name" class="item"><strong>-db NAME</strong> or <strong>--dbname=NAME</strong></a></strong></dt>
<dd>
<p>Specifies which database to connect to. Can be a comma-separated list of names, and multiple dbname
arguments are allowed. If no dbname option is provided, defaults to the <code>PGDATABASE</code> environment variable.
If that is not set, it defaults to 'postgres' if psql is version 8 or greater, and 'template1' otherwise.</p>
</dd>
<dt><strong><a name="u_username_or_dbuser_username" class="item"><strong>-u USERNAME</strong> or <strong>--dbuser=USERNAME</strong></a></strong></dt>
<dd>
<p>The name of the database user to connect as. Can be a comma-separated list of usernames, and multiple
dbuser arguments are allowed. If this is not provided, it defaults to the <code>PGUSER</code> environment variable, otherwise
it defaults to 'postgres'.</p>
</dd>
<dt><strong><a name="dbpass_password" class="item"><strong>--dbpass=PASSWORD</strong></a></strong></dt>
<dd>
<p>Provides the password to connect to the database with. Use of this option is highly discouraged.
Instead, one should use a .pgpass or pg_service.conf file.</p>
</dd>
<dt><strong><a name="dbservice_name" class="item"><strong>--dbservice=NAME</strong></a></strong></dt>
<dd>
<p>The name of a service inside of the pg_service.conf file. Before version 9.0 of Postgres, this is
a global file, usually found in /etc/pg_service.conf. If you are using version 9.0 or higher of
Postgres, you can use the file ".pg_service.conf" in the home directory of the user running
the script, e.g. nagios.</p>
<p>This file contains a simple list of connection options. You can also pass additional information
when using this option such as --dbservice="maindatabase sslmode=require"</p>
<p>The documentation for this file can be found at
<a href="http://www.postgresql.org/docs/current/static/libpq-pgservice.html">http://www.postgresql.org/docs/current/static/libpq-pgservice.html</a></p>
</dd>
</dl>
<p>The database connection options can be grouped: <em>--host=a,b --host=c --port=1234 --port=3344</em>
would connect to a-1234, b-1234, and c-3344. Note that once set, an option
carries over until it is changed again.</p>
<p>Examples:</p>
<pre>
--host=a,b --port=5433 --db=c
Connects twice to port 5433, using database c, to hosts a and b: a-5433-c b-5433-c</pre>
<pre>
--host=a,b --port=5433 --db=c,d
Connects four times: a-5433-c a-5433-d b-5433-c b-5433-d</pre>
<pre>
--host=a,b --host=foo --port=1234 --port=5433 --db=e,f
Connects six times: a-1234-e a-1234-f b-1234-e b-1234-f foo-5433-e foo-5433-f</pre>
<pre>
--host=a,b --host=x --port=5432,5433 --dbuser=alice --dbuser=bob -db=baz
Connects three times: a-5432-alice-baz b-5433-alice-baz x-5433-bob-baz</pre>
<pre>
--dbservice="foo" --port=5433
Connects using the named service 'foo' in the pg_service.conf file, but overrides the port</pre>
<p>
</p>
<hr />
<h1><a name="other_options">OTHER OPTIONS</a></h1>
<p>Other options include:</p>
<dl>
<dt><strong><a name="action_name" class="item"><strong>--action=NAME</strong></a></strong></dt>
<dd>
<p>States what action we are running. Required unless using a symlinked file,
in which case the name of the file is used to figure out the action.</p>
</dd>
<dt><strong><a name="warning_val_or_w_val" class="item"><strong>--warning=VAL or -w VAL</strong></a></strong></dt>
<dd>
<p>Sets the threshold at which a warning alert is fired. The valid options for this
option depends on the action used.</p>
</dd>
<dt><strong><a name="critical_val_or_c_val" class="item"><strong>--critical=VAL or -c VAL</strong></a></strong></dt>
<dd>
<p>Sets the threshold at which a critical alert is fired. The valid options for this
option depends on the action used.</p>
</dd>
<dt><strong><a name="t_val_or_timeout_val" class="item"><strong>-t VAL</strong> or <strong>--timeout=VAL</strong></a></strong></dt>
<dd>
<p>Sets the timeout in seconds after which the script will abort whatever it is doing
and return an UNKNOWN status. The timeout is per Postgres cluster, not for the entire
script. The default value is 10; the units are always in seconds.</p>
</dd>
<dt><strong><a name="assume_standby_mode" class="item"><strong>--assume-standby-mode</strong></a></strong></dt>
<dd>
<p>If specified, first the check if server in standby mode will be performed
(--datadir is required), if so, all checks that require SQL queries will be
ignored and "Server in standby mode" with OK status will be returned instead.</p>
<p>Example:</p>
<pre>
postgres@db$./check_postgres.pl --action=version --warning=8.1 --datadir /var/lib/postgresql/8.3/main/ --assume-standby-mode
POSTGRES_VERSION OK: Server in standby mode | time=0.00</pre>
</dd>
<dt><strong><a name="assume_prod" class="item"><strong>--assume-prod</strong></a></strong></dt>
<dd>
<p>If specified, check if server in production mode is performed (--datadir is required).
The option is only relevant for (<code>symlink: check_postgres_checkpoint</code>).</p>
<p>Example:</p>
<pre>
postgres@db$./check_postgres.pl --action=checkpoint --datadir /var/lib/postgresql/8.3/main/ --assume-prod
POSTGRES_CHECKPOINT OK: Last checkpoint was 72 seconds ago | age=72;;300 mode=MASTER</pre>
</dd>
<dt><strong><a name="h_or_help" class="item"><strong>-h</strong> or <strong>--help</strong></a></strong></dt>
<dd>
<p>Displays a help screen with a summary of all actions and options.</p>
</dd>
<dt><strong><a name="man" class="item"><strong>--man</strong></a></strong></dt>
<dd>
<p>Displays the entire manual.</p>
</dd>
<dt><strong><a name="v_or_version" class="item"><strong>-V</strong> or <strong>--version</strong></a></strong></dt>
<dd>
<p>Shows the current version.</p>
</dd>
<dt><strong><a name="v_or_verbose" class="item"><strong>-v</strong> or <strong>--verbose</strong></a></strong></dt>
<dd>
<p>Set the verbosity level. Can call more than once to boost the level. Setting it to three
or higher (in other words, issuing <code>-v -v -v</code>) turns on debugging information for this
program which is sent to stderr.</p>
</dd>
<dt><strong><a name="showperf_val" class="item"><strong>--showperf=VAL</strong></a></strong></dt>
<dd>
<p>Determines if we output additional performance data in standard Nagios format
(at end of string, after a pipe symbol, using name=value).
VAL should be 0 or 1. The default is 1. Only takes effect if using Nagios output mode.</p>
</dd>
<dt><strong><a name="perflimit_i" class="item"><strong>--perflimit=i</strong></a></strong></dt>
<dd>
<p>Sets a limit as to how many items of interest are reported back when using the
<em>showperf</em> option. This only has an effect for actions that return a large
number of items, such as <strong>table_size</strong>. The default is 0, or no limit. Be
careful when using this with the <em>--include</em> or <em>--exclude</em> options, as
those restrictions are done <em>after</em> the query has been run, and thus your
limit may not include the items you want. Only takes effect if using Nagios output mode.</p>
</dd>
<dt><strong><a name="showtime_val" class="item"><strong>--showtime=VAL</strong></a></strong></dt>
<dd>
<p>Determines if the time taken to run each query is shown in the output. VAL
should be 0 or 1. The default is 1. No effect unless <em>showperf</em> is on.
Only takes effect if using Nagios output mode.</p>
</dd>
<dt><strong><a name="test" class="item"><strong>--test</strong></a></strong></dt>
<dd>
<p>Enables test mode. See the <a href="#test_mode">TEST MODE</a> section below.</p>
</dd>
<dt><strong><a name="pgbindir_path" class="item"><strong>--PGBINDIR=PATH</strong></a></strong></dt>
<dd>
<p>Tells the script where to find the psql binaries. Useful if you have more than
one version of the PostgreSQL executables on your system, or if there are not
in your path. Note that this option is in all uppercase. By default, this option
is <em>not allowed</em>. To enable it, you must change the <code>$NO_PSQL_OPTION</code> near the
top of the script to 0. Avoid using this option if you can, and instead use
environment variable c<PGBINDIR> or hard-coded <code>$PGBINDIR</code> variable, also near
the top of the script, to set the path to the PostgreSQL to use.</p>
</dd>
<dt><strong><a name="psql_path" class="item"><strong>--PSQL=PATH</strong></a></strong></dt>
<dd>
<p><em>(deprecated, this option may be removed in a future release!)</em>
Tells the script where to find the psql program. Useful if you have more than
one version of the psql executable on your system, or if there is no psql program
in your path. Note that this option is in all uppercase. By default, this option
is <em>not allowed</em>. To enable it, you must change the <code>$NO_PSQL_OPTION</code> near the
top of the script to 0. Avoid using this option if you can, and instead hard-code
your psql location into the <code>$PSQL</code> variable, also near the top of the script.</p>
</dd>
<dt><strong><a name="symlinks" class="item"><strong>--symlinks</strong></a></strong></dt>
<dd>
<p>Creates symlinks to the main program for each action.</p>
</dd>
<dt><strong><a name="output_val" class="item"><strong>--output=VAL</strong></a></strong></dt>
<dd>
<p>Determines the format of the output, for use in various programs. The
default is 'nagios'. Available options are 'nagios', 'mrtg', 'simple'
and 'cacti'.</p>
</dd>
<dt><strong><a name="mrtg_val" class="item"><strong>--mrtg=VAL</strong></a></strong></dt>
<dd>
<p>Used only for the MRTG or simple output, for a few specific actions.</p>
</dd>
<dt><strong><a name="debugoutput_val" class="item"><strong>--debugoutput=VAL</strong></a></strong></dt>
<dd>
<p>Outputs the exact string returned by psql, for use in debugging. The value is one or more letters,
which determine if the output is displayed or not, where 'a' = all, 'c' = critical, 'w' = warning,
'o' = ok, and 'u' = unknown. Letters can be combined.</p>
</dd>
<dt><strong><a name="get_method_val" class="item"><strong>--get_method=VAL</strong></a></strong></dt>
<dd>
<p>Allows specification of the method used to fetch information for the <code>new_version_cp</code>,
<code>new_version_pg</code>, <code>new_version_bc</code>, <code>new_version_box</code>, and <code>new_version_tnm</code> checks.
The following programs are tried, in order, to grab the information from the web:
GET, wget, fetch, curl, lynx, links. To force the use of just one (and thus remove the
overhead of trying all the others until one of those works), enter one of the names as
the argument to get_method. For example, a BSD box might enter the following line in
their <code>.check_postgresrc</code> file:</p>
<pre>
get_method=fetch</pre>
</dd>
<dt><strong><a name="language_val" class="item"><strong>--language=VAL</strong></a></strong></dt>
<dd>
<p>Set the language to use for all output messages. Normally, this is detected by examining
the environment variables LC_ALL, LC_MESSAGES, and LANG, but setting this option
will override any such detection.</p>
</dd>
</dl>
<p>
</p>
<hr />
<h1><a name="actions">ACTIONS</a></h1>
<p>The script runs one or more actions. This can either be done with the --action
flag, or by using a symlink to the main file that contains the name of the action
inside of it. For example, to run the action "timesync", you may either issue:</p>
<pre>
check_postgres.pl --action=timesync</pre>
<p>or use a program named:</p>
<pre>
check_postgres_timesync</pre>
<p>All the symlinks are created for you in the current directory
if use the option --symlinks</p>
<pre>
perl check_postgres.pl --symlinks</pre>
<p>If the file name already exists, it will not be overwritten. If the file exists
and is a symlink, you can force it to overwrite by using "--action=build_symlinks_force"</p>
<p>Most actions take a <em>--warning</em> and a <em>--critical</em> option, indicating at what
point we change from OK to WARNING, and what point we go to CRITICAL. Note that
because criticals are always checked first, setting the warning equal to the
critical is an effective way to turn warnings off and always give a critical.</p>
<p>The current supported actions are:</p>
<p>
</p>
<h2><a name="archive_ready"><strong>archive_ready</strong></a></h2>
<p>(<code>symlink: check_postgres_archive_ready</code>) Checks how many WAL files with extension <em class="file">.ready</em>
exist in the <em class="file">pg_xlog/archive_status</em> directory, which is found
off of your <strong>data_directory</strong>. This action must be run as a superuser, in order to access the
contents of the <em class="file">pg_xlog/archive_status</em> directory. The minimum version to use this action is
Postgres 8.1. The <em>--warning</em> and <em>--critical</em> options are simply the number of
<em class="file">.ready</em> files in the <em class="file">pg_xlog/archive_status</em> directory.
Usually, these values should be low, turning on the archive mechanism, we usually want it to
archive WAL files as fast as possible.</p>
<p>If the archive command fail, number of WAL in your <em class="file">pg_xlog</em> directory will grow until
exhausting all the disk space and force PostgreSQL to stop immediately.</p>
<p>Example 1: Check that the number of ready WAL files is 10 or less on host "pluto"</p>
<pre>
check_postgres_archive_ready --host=pluto --critical=10</pre>
<p>For MRTG output, reports the number of ready WAL files on line 1.</p>
<p>
</p>
<h2><a name="autovac_freeze"><strong>autovac_freeze</strong></a></h2>
<p>(<code>symlink: check_postgres_autovac_freeze</code>) Checks how close each database is to the Postgres <strong>autovacuum_freeze_max_age</strong> setting. This
action will only work for databases version 8.2 or higher. The <em>--warning</em> and
<em>--critical</em> options should be expressed as percentages. The 'age' of the transactions
in each database is compared to the autovacuum_freeze_max_age setting (200 million by default)
to generate a rounded percentage. The default values are <strong>90%</strong> for the warning and <strong>95%</strong> for
the critical. Databases can be filtered by use of the <em>--include</em> and <em>--exclude</em> options.
See the <a href="#basic_filtering">BASIC FILTERING</a> section for more details.</p>
<p>Example 1: Give a warning when any databases on port 5432 are above 97%</p>
<pre>
check_postgres_autovac_freeze --port=5432 --warning="97%"</pre>
<p>For MRTG output, the highest overall percentage is reported on the first line, and the highest age is
reported on the second line. All databases which have the percentage from the first line are reported
on the fourth line, separated by a pipe symbol.</p>
<p>
</p>
<h2><a name="backends"><strong>backends</strong></a></h2>
<p>(<code>symlink: check_postgres_backends</code>) Checks the current number of connections for one or more databases, and optionally
compares it to the maximum allowed, which is determined by the
Postgres configuration variable <strong>max_connections</strong>. The <em>--warning</em> and
<em>--critical</em> options can take one of three forms. First, a simple number can be
given, which represents the number of connections at which the alert will be
given. This choice does not use the <strong>max_connections</strong> setting. Second, the
percentage of available connections can be given. Third, a negative number can
be given which represents the number of connections left until <strong>max_connections</strong>
is reached. The default values for <em>--warning</em> and <em>--critical</em> are '90%' and '95%'.
You can also filter the databases by use of the <em>--include</em> and <em>--exclude</em> options.
See the <a href="#basic_filtering">BASIC FILTERING</a> section for more details.</p>
<p>To view only non-idle processes, you can use the <em>--noidle</em> argument. Note that the
user you are connecting as must be a superuser for this to work properly.</p>
<p>Example 1: Give a warning when the number of connections on host quirm reaches 120, and a critical if it reaches 150.</p>
<pre>
check_postgres_backends --host=quirm --warning=120 --critical=150</pre>
<p>Example 2: Give a critical when we reach 75% of our max_connections setting on hosts lancre or lancre2.</p>
<pre>
check_postgres_backends --warning='75%' --critical='75%' --host=lancre,lancre2</pre>
<p>Example 3: Give a warning when there are only 10 more connection slots left on host plasmid, and a critical
when we have only 5 left.</p>
<pre>
check_postgres_backends --warning=-10 --critical=-5 --host=plasmid</pre>
<p>Example 4: Check all databases except those with "test" in their name, but allow ones that are named "pg_greatest". Connect as port 5432 on the first two hosts, and as port 5433 on the third one. We want to always throw a critical when we reach 30 or more connections.</p>
<pre>
check_postgres_backends --dbhost=hong,kong --dbhost=fooey --dbport=5432 --dbport=5433 --warning=30 --critical=30 --exclude="~test" --include="pg_greatest,~prod"</pre>
<p>For MRTG output, the number of connections is reported on the first line, and the fourth line gives the name of the database,
plus the current maximum_connections. If more than one database has been queried, the one with the highest number of
connections is output.</p>
<p>
</p>
<h2><a name="bloat"><strong>bloat</strong></a></h2>
<p>(<code>symlink: check_postgres_bloat</code>) Checks the amount of bloat in tables and indexes. (Bloat is generally the amount
of dead unused space taken up in a table or index. This space is usually reclaimed
by use of the VACUUM command.) This action requires that stats collection be
enabled on the target databases, and requires that ANALYZE is run frequently.
The <em>--include</em> and <em>--exclude</em> options can be used to filter out which tables
to look at. See the <a href="#basic_filtering">BASIC FILTERING</a> section for more details.</p>
<p>The <em>--warning</em> and <em>--critical</em> options can be specified as sizes, percents, or both.
Valid size units are bytes, kilobytes, megabytes, gigabytes, terabytes, exabytes,
petabytes, and zettabytes. You can abbreviate all of those with the first letter. Items
without units are assumed to be 'bytes'. The default values are '1 GB' and '5 GB'. The value
represents the number of "wasted bytes", or the difference between what is actually
used by the table and index, and what we compute that it should be.</p>
<p>Note that this action has two hard-coded values to avoid false alarms on
smaller relations. Tables must have at least 10 pages, and indexes at least 15,
before they can be considered by this test. If you really want to adjust these
values, you can look for the variables <em>$MINPAGES</em> and <em>$MINIPAGES</em> at the top of the
<code>check_bloat</code> subroutine. These values are ignored if either <em>--exclude</em> or
<em>--include</em> is used.</p>
<p>Only the top 10 most bloated relations are shown. You can change this number by
using the <em>--perflimit</em> option to set your own limit.</p>
<p>The schema named 'information_schema' is excluded from this test, as the only tables
it contains are small and do not change.</p>
<p>Please note that the values computed by this action are not precise, and
should be used as a guideline only. Great effort was made to estimate the
correct size of a table, but in the end it is only an estimate. The correct
index size is even more of a guess than the correct table size, but both
should give a rough idea of how bloated things are.</p>
<p>Example 1: Warn if any table on port 5432 is over 100 MB bloated, and critical if over 200 MB</p>
<pre>
check_postgres_bloat --port=5432 --warning='100 M' --critical='200 M'</pre>
<p>Example 2: Give a critical if table 'orders' on host 'sami' has more than 10 megs of bloat</p>
<pre>
check_postgres_bloat --host=sami --include=orders --critical='10 MB'</pre>
<p>Example 3: Give a critical if table 'q4' on database 'sales' is over 50% bloated</p>
<pre>
check_postgres_bloat --db=sales --include=q4 --critical='50%'</pre>
<p>Example 4: Give a critical any table is over 20% bloated <em>and</em> has over 150
MB of bloat:</p>
<pre>
check_postgres_bloat --port=5432 --critical='20% and 150 M'</pre>
<p>Example 5: Give a critical any table is over 40% bloated <em>or</em> has over 500 MB
of bloat:</p>
<pre>
check_postgres_bloat --port=5432 --warning='500 M or 40%'</pre>
<p>For MRTG output, the first line gives the highest number of wasted bytes for the tables, and the
second line gives the highest number of wasted bytes for the indexes. The fourth line gives the database
name, table name, and index name information. If you want to output the bloat ratio instead (how many
times larger the relation is compared to how large it should be), just pass in <code>--mrtg=ratio</code>.</p>
<p>
</p>
<h2><a name="checkpoint"><strong>checkpoint</strong></a></h2>
<p>(<code>symlink: check_postgres_checkpoint</code>) Determines how long since the last checkpoint has
been run. This must run on the same server as the database that is being checked (e.g. the -h
flag will not work). This check is meant to run on a "warm standby" server that is actively
processing shipped WAL files, and is meant to check that your warm standby is truly 'warm'.
The data directory must be set, either by the environment variable <code>PGDATA</code>, or passing
the <code>--datadir</code> argument. It returns the number of seconds since the last checkpoint
was run, as determined by parsing the call to <code>pg_controldata</code>. Because of this, the
pg_controldata executable must be available in the current path. Alternatively,
you can specify <code>PGBINDIR</code> as the directory that it lives in.
It is also possible to use the special options <em>--assume-prod</em> or
<em>--assume-standby-mode</em>, if the mode found is not the one expected, a CRITICAL is emitted.</p>
<p>At least one warning or critical argument must be set.</p>
<p>This action requires the Date::Parse module.</p>
<p>For MRTG or simple output, returns the number of seconds.</p>
<p>
</p>
<h2><a name="cluster_id"><strong>cluster_id</strong></a></h2>
<p>(<code>symlink: check_postgres_cluster-id</code>) Checks that the Database System Identifier
provided by pg_controldata is the same as last time you checked. This must run on the same
server as the database that is being checked (e.g. the -h flag will not work).
Either the <em>--warning</em> or the <em>--critical</em> option should be given, but not both. The value
of each one is the cluster identifier, an integer value. You can run with the special <code>--critical=0</code> option
to find out an existing cluster identifier.</p>
<p>Example 1: Find the initial identifier</p>
<pre>
check_postgres_cluster_id --critical=0 --datadir=/var//lib/postgresql/9.0/main</pre>
<p>Example 2: Make sure the cluster is the same and warn if not, using the result from above.</p>
<pre>
check_postgres_cluster_id --critical=5633695740047915135</pre>
<p>For MRTG output, returns a 1 or 0 indicating success of failure of the identifier to match. A
identifier must be provided as the <code>--mrtg</code> argument. The fourth line always gives the
current identifier.</p>
<p>
</p>
<h2><a name="commitratio"><strong>commitratio</strong></a></h2>
<p>(<code>symlink: check_postgres_commitratio</code>) Checks the commit ratio of all databases and complains when they are too low.
There is no need to run this command more than once per database cluster.
Databases can be filtered with
the <em>--include</em> and <em>--exclude</em> options. See the <a href="#basic_filtering">BASIC FILTERING</a> section
for more details.
They can also be filtered by the owner of the database with the
<em>--includeuser</em> and <em>--excludeuser</em> options.
See the <a href="#user_name_filtering">USER NAME FILTERING</a> section for more details.</p>
<p>The warning and critical options should be specified as percentages. There are not
defaults for this action: the warning and critical must be specified. The warning value
cannot be greater than the critical value. The output returns all databases sorted by
commitratio, smallest first.</p>
<p>Example: Warn if any database on host flagg is less than 90% in commitratio, and critical if less then 80%.</p>
<pre>
check_postgres_database_commitratio --host=flagg --warning='90%' --critical='80%'</pre>
<p>For MRTG output, returns the percentage of the database with the smallest commitratio on the first line,
and the name of the database on the fourth line.</p>
<p>
</p>
<h2><a name="connection"><strong>connection</strong></a></h2>
<p>(<code>symlink: check_postgres_connection</code>) Simply connects, issues a 'SELECT version()', and leaves.
Takes no <em>--warning</em> or <em>--critical</em> options.</p>
<p>For MRTG output, simply outputs a 1 (good connection) or a 0 (bad connection) on the first line.</p>
<p>
</p>
<h2><a name="custom_query"><strong>custom_query</strong></a></h2>
<p>(<code>symlink: check_postgres_custom_query</code>) Runs a custom query of your choosing, and parses the results.
The query itself is passed in through the <code>query</code> argument, and should be kept as simple as possible.
If at all possible, wrap it in a view or a function to keep things easier to manage. The query should
return one or two columns. It is required that one of the columns be named "result" and is the item
that will be checked against your warning and critical values. The second column is for the performance
data and any name can be used: this will be the 'value' inside the performance data section.</p>
<p>At least one warning or critical argument must be specified. What these are set to depends on the type of
query you are running. There are four types of custom_queries that can be run, specified by the <code>valtype</code>
argument. If none is specified, this action defaults to 'integer'. The four types are:</p>
<p><strong>integer</strong>:
Does a simple integer comparison. The first column should be a simple integer, and the warning and
critical values should be the same.</p>
<p><strong>string</strong>:
The warning and critical are strings, and are triggered only if the value in the first column matches
it exactly. This is case-sensitive.</p>
<p><strong>time</strong>:
The warning and the critical are times, and can have units of seconds, minutes, hours, or days.
Each may be written singular or abbreviated to just the first letter. If no units are given,
seconds are assumed. The first column should be an integer representing the number of seconds
to check.</p>
<p><strong>size</strong>:
The warning and the critical are sizes, and can have units of bytes, kilobytes, megabytes, gigabytes,
terabytes, or exabytes. Each may be abbreviated to the first letter. If no units are given,
bytes are assumed. The first column should be an integer representing the number of bytes to check.</p>
<p>Normally, an alert is triggered if the values returned are <strong>greater than</strong> or equal to the critical or warning
value. However, an option of <em>--reverse</em> will trigger the alert if the returned value is
<strong>lower than</strong> or equal to the critical or warning value.</p>
<p>Example 1: Warn if any relation over 100 pages is named "rad", put the number of pages
inside the performance data section.</p>
<pre>
check_postgres_custom_query --valtype=string -w "rad" --query=
"SELECT relname AS result, relpages AS pages FROM pg_class WHERE relpages > 100"</pre>
<p>Example 2: Give a critical if the "foobar" function returns a number over 5MB:</p>
<pre>
check_postgres_custom_query --critical='5MB'--valtype=size --query="SELECT foobar() AS result"</pre>
<p>Example 2: Warn if the function "snazzo" returns less than 42:</p>
<pre>
check_postgres_custom_query --critical=42 --query="SELECT snazzo() AS result" --reverse</pre>
<p>If you come up with a useful custom_query, consider sending in a patch to this program
to make it into a standard action that other people can use.</p>
<p>This action does not support MRTG or simple output yet.</p>
<p>
</p>
<h2><a name="database_size"><strong>database_size</strong></a></h2>
<p>(<code>symlink: check_postgres_database_size</code>) Checks the size of all databases and complains when they are too big.
There is no need to run this command more than once per database cluster.
Databases can be filtered with
the <em>--include</em> and <em>--exclude</em> options. See the <a href="#basic_filtering">BASIC FILTERING</a> section
for more details.
They can also be filtered by the owner of the database with the
<em>--includeuser</em> and <em>--excludeuser</em> options.
See the <a href="#user_name_filtering">USER NAME FILTERING</a> section for more details.</p>
<p>The warning and critical options can be specified as bytes, kilobytes, megabytes,
gigabytes, terabytes, or exabytes. Each may be abbreviated to the first letter as well.
If no unit is given, the units are assumed to be bytes. There are not defaults for this
action: the warning and critical must be specified. The warning value cannot be greater
than the critical value. The output returns all databases sorted by size largest first,
showing both raw bytes and a "pretty" version of the size.</p>
<p>Example 1: Warn if any database on host flagg is over 1 TB in size, and critical if over 1.1 TB.</p>
<pre>
check_postgres_database_size --host=flagg --warning='1 TB' --critical='1.1 t'</pre>
<p>Example 2: Give a critical if the database template1 on port 5432 is over 10 MB.</p>
<pre>
check_postgres_database_size --port=5432 --include=template1 --warning='10MB' --critical='10MB'</pre>
<p>Example 3: Give a warning if any database on host 'tardis' owned by the user 'tom' is over 5 GB</p>
<pre>
check_postgres_database_size --host=tardis --includeuser=tom --warning='5 GB' --critical='10 GB'</pre>
<p>For MRTG output, returns the size in bytes of the largest database on the first line,
and the name of the database on the fourth line.</p>
<p>
</p>
<h2><a name="dbstats"><strong>dbstats</strong></a></h2>
<p>(<code>symlink: check_postgres_dbstats</code>) Reports information from the pg_stat_database view,
and outputs it in a Cacti-friendly manner. No other output is supported, as the output
is informational and does not lend itself to alerts, such as used with Nagios. If no
options are given, all databases are returned, one per line. You can include a specific
database by use of the <code>--include</code> option, or you can use the <a href="#dbname"><code>--dbname</code></a> option.</p>
<p>Eleven items are returned on each line, in the format name:value, separated by a single
space. The items are:</p>
<dl>
<dt><strong><a name="backends" class="item">backends</a></strong></dt>
<dd>
<p>The number of currently running backends for this database.</p>
</dd>
<dt><strong><a name="commits" class="item">commits</a></strong></dt>
<dd>
<p>The total number of commits for this database since it was created or reset.</p>
</dd>
<dt><strong><a name="rollbacks" class="item">rollbacks</a></strong></dt>
<dd>
<p>The total number of rollbacks for this database since it was created or reset.</p>
</dd>
<dt><strong><a name="read" class="item">read</a></strong></dt>
<dd>
<p>The total number of disk blocks read.</p>
</dd>
<dt><strong><a name="hit" class="item">hit</a></strong></dt>
<dd>
<p>The total number of buffer hits.</p>
</dd>
<dt><strong><a name="ret" class="item">ret</a></strong></dt>
<dd>
<p>The total number of rows returned.</p>
</dd>
<dt><strong><a name="fetch" class="item">fetch</a></strong></dt>
<dd>
<p>The total number of rows fetched.</p>
</dd>
<dt><strong><a name="ins" class="item">ins</a></strong></dt>
<dd>
<p>The total number of rows inserted.</p>
</dd>
<dt><strong><a name="upd" class="item">upd</a></strong></dt>
<dd>
<p>The total number of rows updated.</p>
</dd>
<dt><strong><a name="del" class="item">del</a></strong></dt>
<dd>
<p>The total number of rows deleted.</p>
</dd>
<dt><strong><a name="dbname" class="item">dbname</a></strong></dt>
<dd>
<p>The name of the database.</p>
</dd>
</dl>
<p>Note that ret, fetch, ins, upd, and del items will always be 0 if Postgres is version 8.2 or lower, as those stats were
not available in those versions.</p>
<p>If the dbname argument is given, seven additional items are returned:</p>
<dl>
<dt><strong><a name="idxscan" class="item">idxscan</a></strong></dt>
<dd>
<p>Total number of user index scans.</p>
</dd>
<dt><strong><a name="idxtupread" class="item">idxtupread</a></strong></dt>
<dd>
<p>Total number of user index entries returned.</p>
</dd>
<dt><strong><a name="idxtupfetch" class="item">idxtupfetch</a></strong></dt>
<dd>
<p>Total number of rows fetched by simple user index scans.</p>
</dd>
<dt><strong><a name="idxblksread" class="item">idxblksread</a></strong></dt>
<dd>
<p>Total number of disk blocks read for all user indexes.</p>
</dd>
<dt><strong><a name="idxblkshit" class="item">idxblkshit</a></strong></dt>
<dd>
<p>Total number of buffer hits for all user indexes.</p>
</dd>
<dt><strong><a name="seqscan" class="item">seqscan</a></strong></dt>
<dd>
<p>Total number of sequential scans against all user tables.</p>
</dd>
<dt><strong><a name="seqtupread" class="item">seqtupread</a></strong></dt>
<dd>
<p>Total number of tuples returned from all user tables.</p>
</dd>
</dl>
<p>Example 1: Grab the stats for a database named "products" on host "willow":</p>
<pre>
check_postgres_dbstats --dbhost willow --dbname products</pre>
<p>The output returned will be like this (all on one line, not wrapped):</p>
<pre>
backends:82 commits:58374408 rollbacks:1651 read:268435543 hit:2920381758 idxscan:310931294 idxtupread:2777040927
idxtupfetch:1840241349 idxblksread:62860110 idxblkshit:1107812216 seqscan:5085305 seqtupread:5370500520
ret:0 fetch:0 ins:0 upd:0 del:0 dbname:willow</pre>
<p>
</p>
<h2><a name="disabled_triggers"><strong>disabled_triggers</strong></a></h2>
<p>(<code>symlink: check_postgres_disabled_triggers</code>) Checks on the number of disabled triggers inside the database.
The <em>--warning</em> and <em>--critical</em> options are the number of such triggers found, and both
default to "1", as in normal usage having disabled triggers is a dangerous event. If the
database being checked is 8.3 or higher, the check is for the number of triggers that are
in a 'disabled' status (as opposed to being 'always' or 'replica'). The output will show
the name of the table and the name of the trigger for each disabled trigger.</p>
<p>Example 1: Make sure that there are no disabled triggers</p>
<pre>
check_postgres_disabled_triggers</pre>
<p>For MRTG output, returns the number of disabled triggers on the first line.</p>
<p>
</p>
<h2><a name="disk_space"><strong>disk_space</strong></a></h2>
<p>(<code>symlink: check_postgres_disk_space</code>) Checks on the available physical disk space used by Postgres. This action requires
that you have the executable "/bin/df" available to report on disk sizes, and it
also needs to be run as a superuser, so it can examine the <strong>data_directory</strong>
setting inside of Postgres. The <em>--warning</em> and <em>--critical</em> options are
given in either sizes or percentages or both. If using sizes, the standard unit types
are allowed: bytes, kilobytes, gigabytes, megabytes, gigabytes, terabytes, or
exabytes. Each may be abbreviated to the first letter only; no units at all
indicates 'bytes'. The default values are '90%' and '95%'.</p>
<p>This command checks the following things to determine all of the different
physical disks being used by Postgres.</p>
<p><strong>data_directory</strong> - The disk that the main data directory is on.</p>
<p><strong>log directory</strong> - The disk that the log files are on.</p>
<p><strong>WAL file directory</strong> - The disk that the write-ahead logs are on (e.g. symlinked pg_xlog)</p>
<p><strong>tablespaces</strong> - Each tablespace that is on a separate disk.</p>
<p>The output shows the total size used and available on each disk, as well as
the percentage, ordered by highest to lowest percentage used. Each item above
maps to a file system: these can be included or excluded. See the
<a href="#basic_filtering">BASIC FILTERING</a> section for more details.</p>
<p>Example 1: Make sure that no file system is over 90% for the database on port 5432.</p>
<pre>
check_postgres_disk_space --port=5432 --warning='90%' --critical='90%'</pre>
<p>Example 2: Check that all file systems starting with /dev/sda are smaller than 10 GB and 11 GB (warning and critical)</p>
<pre>
check_postgres_disk_space --port=5432 --warning='10 GB' --critical='11 GB' --include="~^/dev/sda"</pre>
<p>Example 4: Make sure that no file system is both over 50% <em>and</em> has over 15 GB</p>
<pre>
check_postgres_disk_space --critical='50% and 15 GB'</pre>
<p>Example 5: Issue a warning if any file system is either over 70% full <em>or</em> has
more than 1T</p>
<pre>
check_postgres_disk_space --warning='1T or 75'</pre>
<p>For MRTG output, returns the size in bytes of the file system on the first line,
and the name of the file system on the fourth line.</p>
<p>
</p>
<h2><a name="fsm_pages"><strong>fsm_pages</strong></a></h2>
<p>(<code>symlink: check_postgres_fsm_pages</code>) Checks how close a cluster is to the Postgres <strong>max_fsm_pages</strong> setting.
This action will only work for databases of 8.2 or higher, and it requires the contrib
module <strong>pg_freespacemap</strong> be installed. The <em>--warning</em> and <em>--critical</em> options should be expressed
as percentages. The number of used pages in the free-space-map is determined by looking in the
pg_freespacemap_relations view, and running a formula based on the formula used for
outputting free-space-map pageslots in the vacuum verbose command. The default values are <strong>85%</strong> for the
warning and <strong>95%</strong> for the critical.</p>
<p>Example 1: Give a warning when our cluster has used up 76% of the free-space pageslots, with pg_freespacemap installed in database robert</p>
<pre>
check_postgres_fsm_pages --dbname=robert --warning="76%"</pre>
<p>While you need to pass in the name of the database where pg_freespacemap is installed, you only need to run this check once per cluster. Also, checking this information does require obtaining special locks on the free-space-map, so it is recommend you do not run this check with short intervals.</p>
<p>For MRTG output, returns the percent of free-space-map on the first line, and the number of pages currently used on
the second line.</p>
<p>
</p>
<h2><a name="fsm_relations"><strong>fsm_relations</strong></a></h2>
<p>(<code>symlink: check_postgres_fsm_relations</code>) Checks how close a cluster is to the Postgres <strong>max_fsm_relations</strong> setting.
This action will only work for databases of 8.2 or higher, and it requires the contrib module <strong>pg_freespacemap</strong> be
installed. The <em>--warning</em> and <em>--critical</em> options should be expressed as percentages. The number of used relations
in the free-space-map is determined by looking in the pg_freespacemap_relations view. The default values are <strong>85%</strong> for
the warning and <strong>95%</strong> for the critical.</p>
<p>Example 1: Give a warning when our cluster has used up 80% of the free-space relations, with pg_freespacemap installed in database dylan</p>
<pre>
check_postgres_fsm_relations --dbname=dylan --warning="75%"</pre>
<p>While you need to pass in the name of the database where pg_freespacemap is installed, you only need to run this check
once per cluster. Also,
checking this information does require obtaining special locks on the free-space-map, so it is recommend you do not
run this check with short intervals.</p>
<p>For MRTG output, returns the percent of free-space-map on the first line, the number of relations currently used on
the second line.</p>
<p>
</p>
<h2><a name="hitratio"><strong>hitratio</strong></a></h2>
<p>(<code>symlink: check_postgres_hitratio</code>) Checks the hit ratio of all databases and complains when they are too low.
There is no need to run this command more than once per database cluster.
Databases can be filtered with
the <em>--include</em> and <em>--exclude</em> options. See the <a href="#basic_filtering">BASIC FILTERING</a> section
for more details.
They can also be filtered by the owner of the database with the
<em>--includeuser</em> and <em>--excludeuser</em> options.
See the <a href="#user_name_filtering">USER NAME FILTERING</a> section for more details.</p>
<p>The warning and critical options should be specified as percentages. There are not
defaults for this action: the warning and critical must be specified. The warning value
cannot be greater than the critical value. The output returns all databases sorted by
hitratio, smallest first.</p>
<p>Example: Warn if any database on host flagg is less than 90% in hitratio, and critical if less then 80%.</p>
<pre>
check_postgres_hitratio --host=flagg --warning='90%' --critical='80%'</pre>
<p>For MRTG output, returns the percentage of the database with the smallest hitratio on the first line,
and the name of the database on the fourth line.</p>
<p>
</p>
<h2><a name="hot_standby_delay"><strong>hot_standby_delay</strong></a></h2>
<p>(<code>symlink: check_hot_standby_delay</code>) Checks the streaming replication lag by computing the delta
between the xlog position of a master server and the one of the slaves connected to it. The slave_
server must be in hot_standby (e.g. read only) mode, therefore the minimum version to use this_
action is Postgres 9.0. The <em>--warning</em> and <em>--critical</em> options are the delta between xlog
location. These values should match the volume of transactions needed to have the streaming
replication disconnect from the master because of too much lag.</p>
<p>You must provide information on how to reach the second database by a connection
parameter ending in the number 2, such as "--dbport2=5543". If if it not given,
the action fails.</p>
<p>
</p>
<h2><a name="index_size"><strong>index_size</strong></a></h2>
<p>
</p>
<h2><a name="table_size"><strong>table_size</strong></a></h2>
<p>
</p>
<h2><a name="relation_size"><strong>relation_size</strong></a></h2>
<p>(symlinks: <code>check_postgres_index_size</code>, <code>check_postgres_table_size</code>, and <code>check_postgres_relation_size</code>)
The actions <strong>table_size</strong> and <strong>index_size</strong> are simply variations of the
<strong>relation_size</strong> action, which checks for a relation that has grown too big.
Relations (in other words, tables and indexes) can be filtered with the
<em>--include</em> and <em>--exclude</em> options. See the <a href="#basic_filtering">BASIC FILTERING</a> section
for more details. Relations can also be filtered by the user that owns them,
by using the <em>--includeuser</em> and <em>--excludeuser</em> options.
See the <a href="#user_name_filtering">USER NAME FILTERING</a> section for more details.</p>
<p>The values for the <em>--warning</em> and <em>--critical</em> options are file sizes, and
may have units of bytes, kilobytes, megabytes, gigabytes, terabytes, or exabytes.
Each can be abbreviated to the first letter. If no units are given, bytes are
assumed. There are no default values: both the warning and the critical option
must be given. The return text shows the size of the largest relation found.</p>
<p>If the <em>--showperf</em> option is enabled, <em>all</em> of the relations with their sizes
will be given. To prevent this, it is recommended that you set the
<em>--perflimit</em> option, which will cause the query to do a
<code>ORDER BY size DESC LIMIT (perflimit)</code>.</p>
<p>Example 1: Give a critical if any table is larger than 600MB on host burrick.</p>
<pre>
check_postgres_table_size --critical='600 MB' --warning='600 MB' --host=burrick</pre>
<p>Example 2: Warn if the table products is over 4 GB in size, and give a critical at 4.5 GB.</p>
<pre>
check_postgres_table_size --host=burrick --warning='4 GB' --critical='4.5 GB' --include=products</pre>
<p>Example 3: Warn if any index not owned by postgres goes over 500 MB.</p>