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IDS Forum

Long checkpoint

Posted By: RONALD OLAVIDEZ
Date: Wednesday, 9 December 2015, at 7:40 p.m.

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

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