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IDS Forum

Re: Long checkpoint

Posted By: Art Kagel
Date: Wednesday, 9 December 2015, at 8:20 p.m.

In Response To: Long checkpoint (RONALD OLAVIDEZ)

Look at the right side of the onstat -g ckp output. The IO/sec outputs are
half of what they are when the checkpoints are "normal". That's a clue.
Check your onstat -g ioh output around the time of the long checkpoint and
see what chunks are experiencing slow IO performance and start the tracking
from there. For now, you can try to shift some of the IO back towards more
idle writes and less checkpoint IO.

Art

Art S. Kagel, President and Principal Consultant
ASK Database Management
www.askdbmgt.com

Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions
and do not reflect on the IIUG, nor any other organization with which I am
associated either explicitly, implicitly, or by inference. Neither do
those opinions reflect those of other individuals affiliated with any
entity with which I am affiliated nor those of the entities themselves.

On Wed, Dec 9, 2015 at 7:40 PM, RONALD OLAVIDEZ <ronald.olavidez@gmail.com>
wrote:

> Hi iiug team,
>
> May i ask your help on how can i trap or any utilities available to trap
> what
> is causing the long checkpoint in my production db. It is running IDS
> 11.7FCx
> in AIX 7. This doesn't happened before just started last month and it's not
> consistently showing.
>
> Here are the logs i gathered.
>
> ------Long transaction dates/time--------------------
>
> 11/23/15 19:44:31 Checkpoint Completed: duration was 184 seconds.
> 11/23/15 19:44:31 Checkpoint Statistics - Avg. Txn Block Time 177.825, #
> Txns
> blocked 2874, Plog used 40786, Llog used 130992
>
> 11/29/15 19:32:52 Checkpoint Completed: duration was 125 seconds.
> 11/29/15 19:32:52 Checkpoint Statistics - Avg. Txn Block Time 120.736, #
> Txns
> blocked 2010, Plog used 31231, Llog used 91712
>
> 12/02/15 19:21:31 Checkpoint Completed: duration was 87 seconds.
> 12/02/15 19:21:31 Checkpoint Statistics - Avg. Txn Block Time 86.223, #
> Txns
> blocked 1433, Plog used 11267, Llog used 41602
>
> 12/09/15 19:12:13 Checkpoint Completed: duration was 142 seconds.
> 12/09/15 19:12:13 Checkpoint Statistics - Avg. Txn Block Time 138.812, #
> Txns
> blocked 1667, Plog used 14930, Llog used 63975
>
> 2/09/15 19:12:10 Maximum server connections 6913
> 12/09/15 19:12:10 Checkpoint Statistics - Avg. Txn Block Time 0.002, # Txns
> blocked 0, Plog used 23276, Llog used 0
>
> --------------------onstat -g ckp -------------
>
> This is what i gathered yesterday:take a look at Interval=485741 19:12:12
> CKPTINTVL 532451:0x5bb5f3c 142.3 2.9 0.0 1667 138.8 28.9 139.3 25871 8915
> 14930 34 63975 145, it showed long transaction that caused the issue.
>
> Critical Sections Physical Log Logical Log
>
> Clock Total Flush Block # Ckpt Wait Long # Dirty Dskflu Total Avg Total Avg
> Interval Time Trigger LSN Time Time Time Waits Time Time Time Buffers /Sec
> Pages /Sec Pages /Sec
> 485734 18:34:48 CKPTINTVL 532439:0xa669018 0.2 0.2 0.0 1 0.0 0.0 0.0 29589
> 29589 17974 59 95597 318
> 485735 18:39:48 CKPTINTVL 532441:0x7fbc018 0.3 0.3 0.0 5 0.0 0.0 0.0 35788
> 35788 20912 69 92549 308
> 485736 18:44:49 CKPTINTVL 532443:0x3aaa018 0.3 0.2 0.0 1 0.0 0.0 0.0 30985
> 30985 17939 59 84788 281
> 485737 18:49:49 CKPTINTVL 532444:0xc78e018 0.3 0.2 0.0 2 0.0 0.0 0.0 29279
> 29279 17922 59 87309 291
> 485738 18:54:49 CKPTINTVL 532446:0xb8a6018 0.3 0.3 0.0 4 0.0 0.0 0.0 32786
> 32786 19972 66 98626 328
> 485739 18:59:50 CKPTINTVL 532448:0x660b018 0.5 0.4 0.0 2 0.0 0.0 0.0 29485
> 29485 18451 61 81282 270
> 485740 19:04:50 CKPTINTVL 532450:0x2caf018 0.3 0.3 0.0 2 0.0 0.0 0.0 38505
> 38505 21534 71 87862 292
> 485741 19:12:12 CKPTINTVL 532451:0x5bb5f3c 142.3 2.9 0.0 1667 138.8 28.9
> 139.3
> 25871 8915 14930 34 63975 145
> 485742 19:17:12 CKPTINTVL 532453:0x339e018 0.4 0.4 0.0 4 0.0 0.0 0.0 40501
> 40501 23867 78 92178 304
> 485743 19:22:13 CKPTINTVL 532454:0xbe8a018 0.2 0.2 0.0 7 0.0 0.0 0.0 30827
> 30827 18842 62 86823 288
> 485744 19:27:13 CKPTINTVL 532456:0x72ef018 0.3 0.2 0.0 4 0.0 0.0 0.0 31998
> 31998 19563 65 83159 277
> 485745 19:32:15 CKPTINTVL 532458:0x42fb018 0.3 0.3 0.0 3 0.0 0.0 0.0 33894
> 33894 19917 65 90149 298
> 485746 19:37:16 CKPTINTVL 532460:0x9baf658 0.3 0.3 0.0 5 0.0 0.0 0.0 37736
> 37736 22391 74 125239 416
> 485747 19:42:16 CKPTINTVL 532462:0x94c9018 0.3 0.2 0.0 5 0.0 0.0 0.0 34235
> 34235 20937 69 100705 335
> 485748 19:47:17 CKPTINTVL 532464:0x96c7344 0.4 0.3 0.0 9 0.0 0.0 0.0 41459
> 41459 23133 76 103005 342
> 485749 19:52:19 CKPTINTVL 532466:0x8e8f018 0.3 0.3 0.0 3 0.0 0.0 0.0 38774
> 38774 21404 70 100332 332
> 485750 19:57:19 CKPTINTVL 532468:0x5c48198 0.3 0.3 0.0 3 0.0 0.0 0.0 36308
> 36308 21244 70 89616 298
> 485751 20:02:19 CKPTINTVL 532470:0x3a78018 0.3 0.3 0.0 8 0.0 0.0 0.0 36139
> 36139 20656 68 93775 312
> 485752 20:07:20 CKPTINTVL 532471:0xa5c1c18 0.3 0.2 0.0 8 0.0 0.0 0.0 31932
> 31932 18548 61 78751 261
> 485753 20:12:21 CKPTINTVL 532473:0x7fb3018 0.3 0.3 0.0 1 0.0 0.0 0.0 38619
> 38619 21196 70 92707 307
>
> Max Plog Max Llog Max Dskflush Avg Dskflush Avg Dirty Blocked
> pages/sec pages/sec Time pages/sec pages/sec Time
> 6706 3688 7 42347 9 0
>
> I didn't see any error message in DB log but long checkpoint shows it's
> affecting the application, eventually had "ISAM error: Lock Timeout
> Expired".
>
> Thanks in advance.
>
> Ron
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--001a113eeaf43bce1105268101b8

Messages In This Thread

  • Long checkpoint
    RONALD OLAVIDEZ -- Wednesday, 9 December 2015, at 7:40 p.m.
    • Re: Long checkpoint
      Art Kagel -- Wednesday, 9 December 2015, at 8:20 p.m.
    • Re: Long checkpoint
      BENJAMIN THOMPSON -- Thursday, 10 December 2015, at 9:15 a.m.

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