When using Talend Administration Center to retrieve, schedule, 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
table.
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
documentation.
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.