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IDS Forum

Re: RE: Checkpoints slowing down the insert on....

Posted By: NITIN MATHUR
Date: Wednesday, 2 April 2014, at 3:21 p.m.

In Response To: RE: Checkpoints slowing down the insert on.... (Alexandre Marini)

I posted the output after rolling back the change, please see the lines from the online log (I also turned OFF AUTO_CKPTS)

4/01/14 16:48:29 Maximum server connections 31
04/01/14 16:48:29 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 12727, Llog used 25651

04/01/14 16:53:30 Checkpoint Completed: duration was 0 seconds.
04/01/14 16:53:30 Tue Apr 1 - loguniq 100491, logpos 0xdaf0018, timestamp: 0xbd378740 Interval: 191005

04/01/14 16:53:30 Maximum server connections 31
04/01/14 16:53:30 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 13964, Llog used 28492

04/01/14 16:58:30 Checkpoint Completed: duration was 0 seconds.
04/01/14 16:58:30 Tue Apr 1 - loguniq 100491, logpos 0x14f15018, timestamp: 0xbd3ff0a7 Interval: 191006

04/01/14 16:58:30 Maximum server connections 31
04/01/14 16:58:30 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 10918, Llog used 29775

04/01/14 17:00:06 Logical Log 100491 Complete, timestamp: 0xbd43dd3a.
04/01/14 17:00:06 Logical Log 100491 - Backup Started
04/01/14 17:00:21 Logical Log 100491 - Backup Completed
04/01/14 17:00:58 Value of RTO_SERVER_RESTART has been changed to 1800.
04/01/14 17:01:01 Checkpoint Completed: duration was 2 seconds.
04/01/14 17:01:01 Tue Apr 1 - loguniq 100492, logpos 0x5cf2138, timestamp: 0xbd49dd36 Interval: 191007

04/01/14 17:01:01 Maximum server connections 31
04/01/14 17:01:01 Checkpoint Statistics - Avg. Txn Block Time 0.001, # Txns blocked 1, Plog used 63430, Llog used 38520

04/01/14 17:01:07 Value of AUTO_CKPTS has been changed to Off.
04/01/14 17:10:09 Checkpoint Completed: duration was 3 seconds.
04/01/14 17:10:09 Tue Apr 1 - loguniq 100492, logpos 0xd8c4198, timestamp: 0xbd549679 Interval: 191008

04/01/14 17:10:09 Maximum server connections 31
04/01/14 17:10:09 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 1, Plog used 25876, Llog used 33234

04/01/14 17:10:16 Checkpoint Completed: duration was 2 seconds.

I rolled it back this morning

04/02/14 08:09:56 Wed Apr 2 - loguniq 100500, logpos 0x7784018, timestamp: 0xbe15b4c9 Interval: 191077

04/02/14 08:09:56 Maximum server connections 34
04/02/14 08:09:56 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 16420, Llog used 19850

04/02/14 08:11:07 Checkpoint Completed: duration was 1 seconds.
04/02/14 08:11:07 Wed Apr 2 - loguniq 100500, logpos 0xc5e8018, timestamp: 0xbe1b9491 Interval: 191078

04/02/14 08:11:07 Maximum server connections 34
04/02/14 08:11:07 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 19474, Llog used 20332

04/02/14 08:11:42 Value of AUTO_CKPTS has been changed to On.
04/02/14 08:11:50 Value of RTO_SERVER_RESTART has been changed to 0.
04/02/14 08:12:05 Value of CKPTINTVL has been changed to 600.
04/02/14 08:13:49 Logical Log 100500 Complete, timestamp: 0xbe29b8ef.
04/02/14 08:13:49 Logical Log 100500 - Backup Started
04/02/14 08:14:01 Logical Log 100500 - Backup Completed
04/02/14 08:17:36 Logical Log 100501 Complete, timestamp: 0xbe467e42.
04/02/14 08:17:36 Logical Log 100501 - Backup Started
04/02/14 08:17:50 Logical Log 100501 - Backup Completed
04/02/14 08:21:32 Checkpoint Completed: duration was 1 seconds.
04/02/14 08:21:32 Wed Apr 2 - loguniq 100502, logpos 0x148dc018, timestamp: 0xbe5e5076 Interval: 191079

The size of logical log is 195 MB and we have 121 logs. Every day, we use approx 140 logs, during the peak business hours, we use one log every 2-3 minutes.

I also ran onstat -F -r 1 and noticed that there is one chunk which appears every time when the instance is busy with checkpoint. This chunk contains indexes from the most busy tables. Strangely, one index which is on a single column (which is a unique value for each row for some specific message type) does maximum disk writes (not buffer writes).

create index "informix".tqh_idx9 on "informix".t_quote_history

(qh_id) using btree in t_quote_indx01;

At the moment, I am just trying to delay the checkpoint by making the interval equal to almost 2 hours so that trading doesnt get impacted.

regards,

Nitin

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