* Add sdlog import in sddb.

* Add comments.

sdt/bin/sddaemon.py

@@ -19,7 +19,7 @@
     If we do import it and it's loaded before the double-fork, then the who_am_i()
     func doesn't work anymore. My understanding is that a double-fork is not like
     an exec, i.e. loaded module before the double fork are reused after the double fork.
-    I think that because it's seems that sdapp module init code doesn't get executed 
+    I think that, because it's seems that sdapp module init code doesn't get executed 
     twice (TO BE CONFIRMED).
 """
 

sdt/bin/sddb.py

@@ -14,6 +14,7 @@
 import sqlite3
 import atexit
 import sdapp
+import sdlog
 import sdconfig
 import sddbobj
 import sddbversion

sdt/bin/sddbversion.py

@@ -12,12 +12,17 @@
 """This module contains database versioning routines."""
 
 import sdapp
+import sdlog
 import sddbversionutils
 from sdexception import SDException
-import sdlog
 
 def check_version(conn):
-    """Upgrade the database schema if database version does not match binary version."""
+    """Upgrade the database schema if database version does not match binary version.
+
+    Note
+        This func must be light as executed each time 'synda' starts
+        (except for special case like 'synda -V').
+    """
 
     current_db_version=sddbversionutils.get_db_version(conn)