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IDS Forum

Non-Blocking Checkpoints Appear to be Blocking

Posted By: Plugge, Joe R.
Date: Wednesday, 3 February 2010, at 12:12 p.m.

IDS 11.50.FC4X1 Running on AIX 5300-10. Physical Log size: 2GB

Why would 11.50 touted non-blocking checkpoints be blocking on RTO checkpoint?

I have stored procedures that normally run in 0.0580 seconds and logs show that during this checkpoint they lengthened out to max of 6.915 seconds. This time frame from our logs coincides exactly with the checkpoint listed below:

11:41:55 Checkpoint Completed: duration was 32 seconds.
11:41:55 Checkpoint Statistics - Avg. Txn Block Time 0.001, # Txns blocked 13, Plog used 107308, Llog used 193875

informix @ ibm46:/wic/log/informix: grep Checkpoint /wic/log/informix/message.020210
03:10:35 Checkpoint Completed: duration was 45 seconds.
03:10:35 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 92353, Llog used 205129
04:55:19 Checkpoint Completed: duration was 0 seconds.
04:55:19 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 51468, Llog used 119537
04:55:29 Checkpoint Completed: duration was 0 seconds.
04:55:29 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 556, Llog used 235
05:00:12 Checkpoint Completed: duration was 0 seconds.
05:00:12 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 683, Llog used 628
05:01:05 Checkpoint Completed: duration was 1 seconds.
05:01:05 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 0, Plog used 193, Llog used 97
11:41:55 Checkpoint Completed: duration was 32 seconds.
11:41:55 Checkpoint Statistics - Avg. Txn Block Time 0.001, # Txns blocked 13, Plog used 107308, Llog used 193875
14:44:02 Checkpoint Completed: duration was 33 seconds.
14:44:02 Checkpoint Statistics - Avg. Txn Block Time 0.005, # Txns blocked 2, Plog used 81431, Llog used 211561
17:36:07 Checkpoint Completed: duration was 32 seconds.
17:36:07 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 4, Plog used 79542, Llog used 211501
20:46:23 Checkpoint Completed: duration was 25 seconds.
20:46:23 Checkpoint Statistics - Avg. Txn Block Time 0.000, # Txns blocked 1, Plog used 46930, Llog used 228595
22:03:44 Checkpoint Completed: duration was 19 seconds.
22:03:44 Checkpoint Statistics - Avg. Txn Block Time 0.005, # Txns blocked 8, Plog used 69919, Llog used 219724
informix @ ibm46:/wic/log/informix: onstat -g ckp

IBM Informix Dynamic Server Version 11.50.FC4X1 -- On-Line -- Up 76 days 06:34:36 -- 4496752 Kbytes

AUTO_CKPTS=On RTO_SERVER_RESTART=60 seconds Estimated recovery time 21 seconds

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
100595 22:48:16 RTO 5257:0xf587018 12.6 12.5 0.0 5 0.0 0.1 0.1 59380 4749 58660 26 219019 99
100596 23:22:05 RTO 5260:0x116bc018 13.8 13.8 0.0 2 0.0 0.1 0.1 57247 4162 56585 27 223985 110
100597 23:58:52 RTO 5264:0x937018 16.7 16.6 0.0 2 0.0 0.0 0.1 63266 3806 62737 28 218204 99
100598 03:10:35 RTO 5266:0xfb82018 45.5 45.4 0.0 0 0.0 0.0 0.0 92849 2046 92353 8 205129 17
100599 04:55:19 *User 5268:0x9fed2ac 0.1 0.1 0.0 1 0.0 0.1 0.1 213 213 51468 8 119537 18
100600 04:55:29 *User 5268:0xa0d8018 0.1 0.0 0.0 1 0.0 0.1 0.1 226 226 556 55 235 23
100601 05:00:12 *User 5268:0xa34c428 0.1 0.0 0.0 1 0.0 0.1 0.1 182 182 683 2 628 2
100602 05:01:05 *Backup 5268:0xa3ad88c 0.1 0.1 0.0 0 0.0 0.0 0.0 356 356 193 3 97 1
100603 11:41:55 RTO 5271:0xc0aa018 32.2 31.7 0.0 13 0.0 0.2 0.4 94655 2982 107308 4 193875 8
100604 14:44:01 RTO 5274:0xb2d3018 33.7 33.6 0.0 2 0.0 0.0 0.0 86938 2588 81431 7 211561 19
100605 17:36:06 RTO 5277:0xa4f2018 32.3 32.3 0.0 4 0.0 0.0 0.0 85584 2653 79542 7 211501 20
100606 20:46:23 RTO 5280:0xda81018 25.2 25.1 0.0 1 0.0 0.0 0.0 53568 2137 46930 4 228595 20
100607 22:03:43 RTO 5283:0xe80a3f4 19.6 19.5 0.0 8 0.0 0.1 0.1 93680 4809 69919 15 219724 47
100608 02:33:50 RTO 5286:0x9544018 53.4 53.2 0.0 0 0.0 0.0 0.0 92451 1736 106508 6 193448 11
100609 04:55:12 *User 5286:0x10a3f018 0.2 0.1 0.0 1 0.0 0.2 0.2 173 173 26071 3 29947 3
100610 04:55:16 *User 5286:0x10a46018 0.0 0.0 0.0 1 0.0 0.0 0.0 0 0 6 1 7 1
100611 04:55:25 *User 5286:0x10b4a018 0.1 0.0 0.0 2 0.0 0.0 0.1 238 238 593 65 260 28
100612 05:00:12 *User 5286:0x10df6420 0.1 0.0 0.0 1 0.0 0.1 0.1 186 186 758 2 684 2
100613 05:01:05 *Backup 5286:0x10e4f018 0.1 0.1 0.0 0 0.0 0.0 0.0 352 352 189 3 89 1
100614 11:48:17 RTO 5289:0xc037018 31.2 30.5 0.0 17 0.0 0.4 0.7 89151 2923 109921 4 193749 7

Max Plog Max Llog Max Dskflush Avg Dskflush Avg Dirty Blocked
pages/sec pages/sec Time pages/sec pages/sec Time
1228 1227 78 1594 0 0

Anybody have any tips on this?

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