Hello,
We are running workload on a EDB Postgres Advanced Server 9.6 and we see that 99% of the time is spent on WAL wait events:
System Wait
Information
WAIT NAME COUNT WAIT TIME % WAIT
---------------------------------------------------------------------------
wal flush 564552 298.789464 41.67
wal write 521514 211.601124 29.51
wal file sync 521546 205.519643 28.66
WAIT NAME COUNT WAIT TIME % WAIT
---------------------------------------------------------------------------
wal flush 564552 298.789464 41.67
wal write 521514 211.601124 29.51
wal file sync 521546 205.519643 28.66
Disk IO performance is not an issue and WAL is on a dedicated disk.
Can somebody pls suggest if there is any possibility to improve this & how?
We already tried wal_buffers=96m, wal_sync_method=open_sync/open_datasync, checkpoint_completion_target=0.9 but none of those helped.
System has 32GB RAM and shared_buffers=8GB. All transactions are happening on a single table which has about 1.5m records and the table size is 1.7GB with just one PK index.
Many Thanks
Regards
