Thread: Lock during insert statement
Could any one please tell me why my system is waiting to get lock for an INSERT statement?
2014-05-21 07:52:49.965 PDT [9-1]LOG: process 31407 acquired ExclusiveLock on extension of relation 429298276 of database 21497 after 3219.963 ms
2014-05-21 07:52:49.965 PDT [10-1]STATEMENT: INSERT INTO table1 (end_id,account_id,create_time,event_type,details) VALUES($1,$2,$3,$4,$5)
2014-05-21 07:52:49.965 PDT [3-1]LOG: duration: 4590.048 ms execute <unnamed>: INSERT INTO table1 (end_id,account_id,create_time,event_type,details) VALUES($1,$2,$3,$4,$5)
Thanks.
On Wed, May 21, 2014 at 3:14 PM, AI Rumman <rummandba@gmail.com> wrote:
Could any one please tell me why my system is waiting to get lock for an INSERT statement?2014-05-21 07:52:49.965 PDT [9-1]LOG: process 31407 acquired ExclusiveLock on extension of relation 429298276 of database 21497 after 3219.963 ms
"on extension of relation" means that it needs to add 8KB to the end of the table. That it takes so long to obtain that locks suggests you have a some serious IO congestion.
Cheers,
Jeff
Got it.
Thanks.
Any special parameter to tune it? Like wal_buffers or shared_buffers?
On Wed, May 21, 2014 at 3:28 PM, Jeff Janes <jeff.janes@gmail.com> wrote:
On Wed, May 21, 2014 at 3:14 PM, AI Rumman <rummandba@gmail.com> wrote:Could any one please tell me why my system is waiting to get lock for an INSERT statement?2014-05-21 07:52:49.965 PDT [9-1]LOG: process 31407 acquired ExclusiveLock on extension of relation 429298276 of database 21497 after 3219.963 ms"on extension of relation" means that it needs to add 8KB to the end of the table. That it takes so long to obtain that locks suggests you have a some serious IO congestion.Cheers,Jeff
On Wednesday, May 21, 2014, AI Rumman <rummandba@gmail.com> wrote:
Got it.Thanks.Any special parameter to tune it? Like wal_buffers or shared_buffers?
Possible but unlikely. You probably just need better hardware (or more patience). How fast is the database growing? How much is actually being written (sar, vmstat)? What is the expected theoretical write throughput of your RAID?
Cheers,
Jeff