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06_defaultmx.lst
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SQL> @06_defaultmx
SQL> set echo on
SQL> set timing on
SQL> set linesize 1000
SQL> set pagesize 100
SQL> set trims on
SQL> column partition_name format a40
SQL> column ndv_alg format a30
SQL> column inc_stale format a30
SQL>
SQL> drop table t1 purge;
Table dropped.
Elapsed: 00:00:00.04
SQL> drop table exch purge;
Table dropped.
Elapsed: 00:00:00.03
SQL>
SQL> create table t1 (id number(10),num1 number(10), num2 number(10),txt varchar2(20))
2 partition by range (num1)
3 interval (1) (
4 partition p1 values less than (1)
5 ,partition p2 values less than (2));
Table created.
Elapsed: 00:00:00.01
SQL>
SQL> insert /*+ APPEND */ into t1
2 select rownum, mod(rownum,2), mod(rownum,1000),'X'||mod(rownum,10000)
3 from (select 1 from dual connect by level <=1000);
1000 rows created.
Elapsed: 00:00:00.03
SQL>
SQL> commit;
Commit complete.
Elapsed: 00:00:00.01
SQL>
SQL> create table exch as select * from t1 where 1=-1;
Table created.
Elapsed: 00:00:00.01
SQL>
SQL> insert /*+ APPEND */ into exch
2 select rownum,0,mod(rownum,10000),'X'||mod(rownum,100000)
3 from (select 1 from dual connect by level <=100);
100 rows created.
Elapsed: 00:00:00.02
SQL>
SQL> commit;
Commit complete.
Elapsed: 00:00:00.00
SQL>
SQL> --
SQL> -- Enable incremental statistics
SQL> --
SQL> exec dbms_stats.set_table_prefs(null,'t1','incremental','true')
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
SQL> exec dbms_stats.set_table_prefs(null,'exch','incremental','true')
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
SQL>
SQL> --
SQL> -- Prepare to create a synopsis on the EXCH table
SQL> --
SQL> exec DBMS_STATS.SET_TABLE_PREFS (null,'exch','INCREMENTAL_LEVEL','table');
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.01
SQL> --
SQL> -- The exchange table has an new-style synopsis
SQL> --
SQL> exec dbms_stats.set_table_prefs(null,'exch', 'approximate_ndv_algorithm', 'hyperloglog')
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
SQL> exec dbms_stats.gather_table_stats(null,'exch');
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.04
SQL>
SQL> --
SQL> -- The partitioned table has old-style synopses
SQL> --
SQL> exec dbms_stats.set_table_prefs(null,'t1', 'approximate_ndv_algorithm', 'adaptive sampling')
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
SQL> exec dbms_stats.gather_table_stats(null,'t1')
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.17
SQL>
SQL> @t1check
SQL> select subobject_name partition_name,
2 decode(h.spare1,NULL,'ADAPTIVE SAMPLING','HYPERLOGLOG') synopsis_type
3 from dba_objects o,
4 sys.wri$_optstat_synopsis_head$ h
5 where o.object_type = 'TABLE PARTITION'
6 and o.object_name = 'T1'
7 and o.owner = USER
8 and h.group# = o.object_id*2
9 and intcol# = 1
10 order by partition_name;
PARTITION_NAME SYNOPSIS_TYPE
---------------------------------------- -----------------
P1 ADAPTIVE SAMPLING
P2 ADAPTIVE SAMPLING
Elapsed: 00:00:00.00
SQL>
SQL>
SQL>
SQL> pause
SQL>
SQL> alter table t1 exchange partition p1 with table exch;
Table altered.
Elapsed: 00:00:00.01
SQL>
SQL> @t1check
SQL> select subobject_name partition_name,
2 decode(h.spare1,NULL,'ADAPTIVE SAMPLING','HYPERLOGLOG') synopsis_type
3 from dba_objects o,
4 sys.wri$_optstat_synopsis_head$ h
5 where o.object_type = 'TABLE PARTITION'
6 and o.object_name = 'T1'
7 and o.owner = USER
8 and h.group# = o.object_id*2
9 and intcol# = 1
10 order by partition_name;
PARTITION_NAME SYNOPSIS_TYPE
---------------------------------------- -----------------
P1 HYPERLOGLOG
P2 ADAPTIVE SAMPLING
Elapsed: 00:00:00.00
SQL>
SQL>
SQL>
SQL> pause
SQL>
SQL> --
SQL> -- Add a partition
SQL> --
SQL> insert /*+ APPEND */ into t1
2 select rownum, 5, mod(rownum,1000),'X'||mod(rownum,10000)
3 from (select 1 from dual connect by level <=1000);
1000 rows created.
Elapsed: 00:00:00.02
SQL>
SQL> exec dbms_stats.gather_table_stats(null,'t1')
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.11
SQL>
SQL> @t1check
SQL> select subobject_name partition_name,
2 decode(h.spare1,NULL,'ADAPTIVE SAMPLING','HYPERLOGLOG') synopsis_type
3 from dba_objects o,
4 sys.wri$_optstat_synopsis_head$ h
5 where o.object_type = 'TABLE PARTITION'
6 and o.object_name = 'T1'
7 and o.owner = USER
8 and h.group# = o.object_id*2
9 and intcol# = 1
10 order by partition_name;
PARTITION_NAME SYNOPSIS_TYPE
---------------------------------------- -----------------
P1 ADAPTIVE SAMPLING
P2 ADAPTIVE SAMPLING
SYS_P3090 ADAPTIVE SAMPLING
Elapsed: 00:00:00.00
SQL>
SQL>
SQL>
SQL> pause
SQL>
SQL> --
SQL> -- Make P1 stale
SQL> --
SQL> insert /*+ APPEND */ into t1
2 select rownum, 0, mod(rownum,1000),'X'||mod(rownum,10000)
3 from (select 1 from dual connect by level <=1000);
1000 rows created.
Elapsed: 00:00:00.01
SQL>
SQL> exec dbms_stats.gather_table_stats(null,'t1')
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.11
SQL>
SQL> @t1check
SQL> select subobject_name partition_name,
2 decode(h.spare1,NULL,'ADAPTIVE SAMPLING','HYPERLOGLOG') synopsis_type
3 from dba_objects o,
4 sys.wri$_optstat_synopsis_head$ h
5 where o.object_type = 'TABLE PARTITION'
6 and o.object_name = 'T1'
7 and o.owner = USER
8 and h.group# = o.object_id*2
9 and intcol# = 1
10 order by partition_name;
PARTITION_NAME SYNOPSIS_TYPE
---------------------------------------- -----------------
P1 ADAPTIVE SAMPLING
P2 ADAPTIVE SAMPLING
SYS_P3090 ADAPTIVE SAMPLING
Elapsed: 00:00:00.00
SQL>
SQL>
SQL> spool off