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IDS Forum

Not sure if I have a problem with CKPs

Posted By: DAVID GROVE
Date: Thursday, 28 February 2019, at 3:19 p.m.

IDS 12.10.FC12
Solaris 10 1/13

I sometimes observe a period of very frequent checkpoints. The system is a primary and there is one RSS. Here is an example of what I observe:

informix@ifmx-prod-anc>onstat -g ckp

IBM Informix Dynamic Server Version 12.10.FC12 -- On-Line -- Up 1 days 23:47:31 -- 19693568 Kbytes

AUTO_CKPTS=On RTO_SERVER_RESTART=Off

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
727476 10:00:09 IPL 39083:0x7658018 0.0 0.0 0.0 2 0.0 0.0 0.0 112 112 119 119 33 33
727477 10:00:10 IPL 39083:0x7a50018 0.0 0.0 0.0 1 0.0 0.0 0.0 449 449 500 500 1016 1016
727478 10:00:10 IPL 39083:0x7a66018 0.0 0.0 0.0 2 0.0 0.0 0.0 47 47 115 115 22 22
727479 10:00:11 IPL 39083:0x7d74018 0.0 0.0 0.0 1 0.0 0.0 0.0 523 523 133 133 782 782
727480 10:00:15 IPL 39083:0x801c018 0.1 0.1 0.0 2 0.0 0.0 0.0 1467 1467 1194 298 680 170
727481 10:00:39 IPL 39083:0xc0a8018 0.2 0.2 0.0 1 0.0 0.0 0.0 5324 5324 5307 221 16524 688
727482 10:00:39 IPL 39083:0xc0bb018 0.0 0.0 0.0 1 0.0 0.0 0.0 67 67 325 325 19 19
727483 10:00:39 IPL 39083:0xc0fd018 0.0 0.0 0.0 1 0.0 0.0 0.0 74 74 76 76 66 66
727484 10:00:40 IPL 39083:0xc135018 0.0 0.0 0.0 1 0.0 0.0 0.0 135 135 133 133 56 56
727485 10:00:42 IPL 39083:0xc628018 0.0 0.0 0.0 2 0.0 0.0 0.0 608 608 624 312 1275 637
727486 10:00:42 IPL 39083:0xc639018 0.0 0.0 0.0 1 0.0 0.0 0.0 56 56 147 147 20 20
727487 10:00:42 IPL 39083:0xc64e018 0.0 0.0 0.0 1 0.0 0.0 0.0 56 56 113 113 24 24
727488 10:00:42 IPL 39083:0xc6902c0 0.0 0.0 0.0 3 0.0 0.0 0.0 114 114 168 168 69 69
727489 10:00:43 IPL 39084:0x294018 0.0 0.0 0.0 1 0.0 0.0 0.0 535 535 583 583 1028 1028
727490 10:00:43 IPL 39084:0x2cd018 0.0 0.0 0.0 2 0.0 0.0 0.0 130 130 246 246 57 57
727491 10:00:43 IPL 39084:0x330018 0.0 0.0 0.0 1 0.0 0.0 0.0 80 80 72 72 99 99
727492 10:10:55 CKPTINTVL 39084:0x2841018 0.2 0.2 0.0 1 0.0 0.0 0.0 8836 8836 5148 8 9496 15
727493 10:20:55 CKPTINTVL 39084:0x4c54018 0.3 0.3 0.0 0 0.0 0.0 0.0 10229 10229 10178 16 9235 15
727494 10:30:55 CKPTINTVL 39084:0x666e018 0.1 0.1 0.0 0 0.0 0.0 0.0 1844 1844 1839 3 6682 11
727495 10:40:55 CKPTINTVL 39084:0x9b41018 0.4 0.4 0.0 0 0.0 0.0 0.0 15507 15507 12338 20 13523 22

Max Plog Max Llog Max Dskflush Avg Dskflush Avg Dirty Blocked
pages/sec pages/sec Time pages/sec pages/sec Time
10240 2084 1 5410 6 0

I don't see any messages in the log, though.

I wonder if these could be secondary checkpoints (from index builds) that Madison mentioned a couple years ago when replying to someone's question about frequent checkpoints.

If so, maybe there is no problem brewing at all (?)

Thank you for any comments.

Regards,

DG

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