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IDS Forum

Re: CHKPTINTVL inconsistent

Posted By: JACQUES RENAUT
Date: Wednesday, 11 December 2013, at 11:56 a.m.

In Response To: CHKPTINTVL inconsistent (MARK JALKIEWICZ)

Original post:

11.70.FC4 AIX

RTO_SERVER_RESTART 0
AUTO_CKPTS 1
CKPTINTVL 300

I have noticed that on a production HDR instance the checkpoint interval is not staying true around the 300 seconds interval. It seems to switch back and forth from 300s to 900s then to 600s, with the only noticeable pattern being that the more dirty the buffers then the checkpoint will fire on the 300 second interval. RTO_SERVER_RESTART is 0. According to the online documentation CKPINTVL and RTO_SERVER_RESTART are mutually exclusive where CKPINTVL is ignored if RTO_SERVER_RESTART is set; does not mention anything about AUTO_CKPTS (set to 1) being in the mix .

Is there a logical explanation ?

here is a snapshot from overnite (very little activity on this instance overnite)

IBM Informix Dynamic SerIBM Informix Dynamic Server Version 11.70.FC4X8 -- On-Line (Prim) -- Up 2 days 22:49:14 -- 953264 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
51840 04:40:06 CKPTINTVL 1462:0x640018 0.0 0.0 0.0 0 0.00 0.0 0.0 1 1 2 0 2 0
51841 04:55:06 CKPTINTVL 1462:0x642018 0.0 0.0 0.0 0 0.00 0.0 0.0 1 1 2 0 2 0
51842 05:00:06 CKPTINTVL 1462:0x64b0e8 0.0 0.0 0.0 0 0.00 0.0 0.0 13 13 13 0 9 0
51843 05:10:06 CKPTINTVL 1462:0x64d018 0.0 0.0 0.0 0 0.00 0.0 0.0 1 1 4 0 2 0
51844 05:25:06 CKPTINTVL 1462:0x64f018 0.0 0.0 0.0 0 0.00 0.0 0.0 1 1 2 0 2 0
51845 05:40:06 CKPTINTVL 1462:0x652018 0.0 0.00 0.0 0 0.00 0.0 0.0 15 15 16 0 3 0
51846 05:55:06 CKPTINTVL 1462:0x654018 0.0 0.0 0.0 0 0.00 0.0 0.0 1 1 14 0 2 0
51847 06:10:07 CKPTINTVL 1462:0x656018 0.0 0.0 0.0 0 0.00 0.0 0.0 1 1 2 0 2 0
51848 06:25:07 CKPTINTVL 1462:0x658018 0.0 0.0 0.0 0 0.00 0.0 0.0 1 1 2 0 2 0
51849 06:40:07 CKPTINTVL 1462:0x65a018 0.0 0.0 0.0 0 0.00 0.0 0.0 1 1 2 0 2 0
51850 06:55:07 CKPTINTVL 1462:0x65c018 0.0 0.0 0.0 0 0.00 0.0 0.0 1 1 2 0 2 0
51851 07:00:07 CKPTINTVL 1462:0x661018 0.0 0.00 0.0 0 0.00 0.0 0.0 34 34 34 0 5 0
51852 07:05:07 CKPTINTVL 1462:0x664348 0.0 0.0 0.0 0 0.00 0.0 0.0 8 8 23 0 3 0
51853 07:10:07 CKPTINTVL 1462:0x668018 0.0 0.00 0.0 0 0.00 0.0 0.0 22 22 25 0 4 0
51854 07:25:07 CKPTINTVL 1462:0x66a018 0.0 0.0 0.0 0 0.00 0.0 0.0 2 2 17 0 2 0
51855 07:30:07 CKPTINTVL 1462:0x6d1018 0.0 0.00 0.0 0 0.00 0.0 0.0 80 80 60 0 103 0
51856 07:40:07 CKPTINTVL 1462:0x6d3018 0.0 0.0 0.0 0 0.00 0.0 0.0 1 1 19 0 2 0
51857 07:55:07 CKPTINTVL 1462:0x6d5018 0.0 0.0 0.0 0 0.00 0.0 0.0 1 1 2 0 2 0
51858 08:05:07 CKPTINTVL 1462:0x6d8348 0.0 0.0 0.0 0 0.00 0.0 0.0 9 9 9 0 3 0
51859 08:10:07 CKPTINTVL 1462:0x6e1018 0.1 0.0 0.0 0 0.00 0.0 0.0 40 40 40 0 9 0

Max Plog Max Llog Max Dskflush Avg Dskflush Avg Dirty Blocked
pages/sec pages/sec Time pages/sec pages/sec Time
427 365 2 602 0 0

Regards,

Mark

Response:

The server will not checkpoint at CKPTINTVL if there was no activity (and by activity I believe it means some sort of activity that would generate log records so read activity would not trigger them), it has been like this for a long while now.

Jacques Renaut
IBM Informix Advanced Support
APD Team

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