On Wed, Mar 25, 2015 at 8:57 PM, Mitu Verma <mitu.ve...@ericsson.com> wrote:
> Hi, > > > > We have a customer complaining about the time taken by one of the > application scripts while deleting older data from the log tables. > > During the deletion, customer reported that he often sees the below error > and because of which table size doesn’t reduce. > You should look into partitioning (implemented via inheritance) for your log table so that you can simply issue a "DROP TABLE ..." > > ERROR: canceling autovacuum task > > Date: 2015-03-14 04:29:19 > > Context: automatic analyze of table > "fm_db_Server3.mmsuper.audittraillogentry" > > > > We have the following queries in this regard: > > - How often is the autovacuum task invoked by postgres > As often as it needs to - based upon changes being made to tables > - If the task gets cancelled (while we were deleting data from > the database) would this task be re-invoked at a later time? > Yes > - If insertion of data into a table also impact this task? > Yes > - If we can manually schedule this task to a particular time > (like off peak hours)? > Yes. You can issue "ANALYZE" (or VACUUM) manually via SQL or the PostgreSQL provided "vacuumdb" command using whatever external scheduling mechanism you have at your disposal. David J.