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IDS Forum

Re: CHKPTINTVL inconsistent

Posted By: Paul Watson
Date: Wednesday, 11 December 2013, at 11:59 a.m.

In Response To: CHKPTINTVL inconsistent (MARK JALKIEWICZ)

If there is nothing to do then there is no checkpoint and no record

Cheers
Paul

> 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
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>

--
Paul Watson
Tel: +1 913-674-0360
Mob: +1 913-387-7529
Web: www.oninit.com

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