When using Talend Administration Center to retrieve, schedule and/or execute Jobs, many update/delete database operations are performed, which may result in performance slowdown if you are using PostgreSQL.
Indeed, it is recommended to execute the
VACUUM command with PostgreSQL, as
items that are deleted or obsoleted by an update are not physically removed from their
The standard form of
VACUUM removes dead row versions in tables and indexes
and marks the space available for future reuse. However, it will not return the space to the
operating system, except in the special case where one or more pages at the end of a table
become entirely free and an exclusive table lock can be easily obtained. In contrast,
VACUUM FULL actively compacts tables by writing a complete new version of
the table file with no dead space. This minimizes the size of the table, but can take a long
time. It also requires extra disk space for the new copy of the table, until the operation
completes. It is recommended to run
VACUUM FULL quarterly.
For more information on the
VACUUM command, see the PostgreSQL
For more information on how to set up automatic vacuuming (which is a process launched at
regular intervals by the PostgreSQL server to execute
VACUUM only on the tables
that have been updated), see the PostgreSQL documentation.