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Re: I/O writes

Posted By: Art Kagel
Date: Friday, 17 July 2009, at 11:15 a.m.

In Response To: Re: I/O writes (KAMRAN HAQ)

Strange how? The CKPTINTVL checkpoints were triggered by CKPTINTVL
expiring, the HA checkpoints were triggered by AUTO_CKPTS to maintain
required recovery time. They are triggered to make certain that there isn't
too much data to roll forward during recovery after a crash. The engine has
to roll forward from the last completed checkpoint, so if you have that
feature turned on, the engine will insert more frequent checkpoints
occassionally during periods of high update load to minimize recovery time.
Art
Art S. Kagel
Oninit (www.oninit.com)
IIUG Board of Directors (art@iiug.org)
Disclaimer: Please keep in mind that my own opinions are my own opinions and
do not reflect on my employer, Oninit, the IIUG, nor any other organization
with which I am associated either explicitly or implicitly. Neither do
those opinions reflect those of other individuals affiliated with any entity
with which I am affiliated nor those of the entities themselves.
On Fri, Jul 17, 2009 at 11:06 AM, KAMRAN HAQ <khaq@i2cinc.com> wrote:
> Hi Art,
> Conitued to previous email, there are strange checkpoint triggers against
> "onstst -g ckp"
>
> -------------------------------------------------------
> $ onstat -g ckp
>
> IBM Informix Dynamic Server Version 11.50.FC3W1 -- On-Line (Prim) (CKPT
> INP)
> -- Up 02:48:27 -- 1183744 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
> 47878 07:48:34 HA 27847:0x27950018 0.1 0.0 0.0 7 0.0 0.1 0.2 147 147 137
> 137
> 262 262
> 47879 07:48:34 HA 27847:0x279dc19c 0.1 0.1 0.0 1 0.0 0.0 0.0 196 196 191
> 191
> 163 163
> 47880 07:48:35 HA 27847:0x27a63018 0.1 0.0 0.0 1 0.0 0.0 0.0 92 92 103 103
> 142
> 142
> 47881 07:48:35 HA 27847:0x27ae3018 0.1 0.0 0.0 2 0.0 0.0 0.0 78 78 73 73
> 133
> 133
> 47882 07:48:36 HA 27847:0x27b89018 0.1 0.1 0.0 2 0.0 0.0 0.0 188 188 169
> 169
> 184 184
> 47883 07:48:37 HA 27847:0x27c6f018 0.2 0.1 0.0 3 0.0 0.1 0.1 248 248 198
> 198
> 271 271
> 47884 07:48:37 HA 27847:0x27d05148 0.1 0.1 0.0 1 0.0 0.0 0.0 128 128 131
> 131
> 163 163
> 47885 07:48:38 HA 27847:0x27de3148 0.1 0.1 0.0 1 0.0 0.0 0.0 188 188 172
> 172
> 232 232
> 47886 07:48:39 HA 27847:0x27e85018 0.1 0.1 0.0 2 0.0 0.0 0.0 155 155 152
> 152
> 171 171
> 47887 07:48:40 HA 27847:0x27f4c21c 0.1 0.1 0.0 2 0.0 0.0 0.0 152 152 146
> 146
> 220 220
> 47888 07:53:50 CKPTINTVL 27847:0x3bbcf148 4.9 4.9 0.0 3 0.0 0.0 0.0 32071
> 6545
> 24851 81 81973 267
> 47889 07:58:35 HA 27848:0xdfac018 4.5 4.5 0.0 5 0.0 0.0 0.0 26676 5961
> 21268
> 74 69274 243
> 47890 07:58:36 HA 27848:0xe2ba018 0.2 0.2 0.0 1 0.0 0.0 0.0 462 462 491 98
> 808
> 161
> 47891 07:58:42 HA 27848:0xe7ce018 0.3 0.3 0.0 3 0.0 0.0 0.0 770 770 675 112
> 1364 227
> 47892 07:58:42 HA 27848:0xe87321c 0.1 0.1 0.0 2 0.0 0.0 0.0 184 184 156 156
> 182 182
> 47893 07:58:44 HA 27848:0xe9b4018 0.2 0.1 0.0 4 0.0 0.0 0.0 258 258 235 117
> 351 175
> 47894 07:58:45 HA 27848:0xea6e018 0.2 0.1 0.0 3 0.0 0.0 0.0 173 173 166 166
> 204 204
> 47895 07:58:45 HA 27848:0xeafb018 0.1 0.1 0.0 2 0.0 0.0 0.0 150 150 150 150
> 152 152
> 47896 07:58:46 HA 27848:0xeb93018 0.1 0.0 0.0 2 0.0 0.0 0.0 97 97 92 92 157
> 157
> 47897 07:58:46 HA 27848:0xec24148 0.1 0.1 0.0 3 0.0 0.0 0.0 142 142 131 131
> 162 162
>
> Max Plog Max Llog Max Dskflush Avg Dskflush Avg Dirty Blocked
> pages/sec pages/sec Time pages/sec pages/sec Time
> 351 560 9 3245 163 0
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
--001636c5b8efbfe483046ee8427f

Messages In This Thread

I/O writes
KAMRAN HAQ -- Friday, 17 July 2009, at 9:33 a.m.
- Re: I/O writes
  Art Kagel -- Friday, 17 July 2009, at 10:39 a.m.
  - Re: I/O writes
    KAMRAN HAQ -- Friday, 17 July 2009, at 11:00 a.m.
    - Re: I/O writes
      KAMRAN HAQ -- Friday, 17 July 2009, at 11:06 a.m.
      - Re: I/O writes
        Art Kagel -- Friday, 17 July 2009, at 11:15 a.m.
    - Re: I/O writes
      Art Kagel -- Friday, 17 July 2009, at 11:11 a.m.
      - Re: I/O writes
        KAMRAN HAQ -- Friday, 17 July 2009, at 11:25 a.m.
        
        Re: I/O writes
        Art Kagel -- Friday, 17 July 2009, at 11:36 a.m.

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