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IDS Forum

Re: FInd Row Id in Partition Table

Posted By: Art Kagel
Date: Tuesday, 4 January 2011, at 11:34 a.m.

In Response To: Re: FInd Row Id in Partition Table (SHAHZAD SALAM KASI)

You cannot easily do that. Look in the SMI (sysmaster) table syslcktab
which will tell you which partnum (ie which fragment - look it up in
systabnames or <databasename>:sysfragments) and the partnum within the
fragment. However, there is still no way to determine exactly which row
that is from any SQL statement.

You can poke at the physical disk page contents and decode the slot table on
the page (the rowid is the ordinal page number within the partition * 256
plus the slot number) using the sysmaster tables or an oncheck -p, but
that's a lot of work and you may still have to decode the binary contents of
the page to see the actual row keys if any are binary data types.

The oncheck command is:

oncheck -pP <tablename>%<fragment_partnum> rowid

Don't forget to translate the partnum and rowid to decimal from hex, so, a
recent transaction of mine showed:

*IBM Informix Dynamic Server Version 11.70.FC1 -- On-Line -- Up 37 days
00:03:49 -- 671908 Kbytes

Locks
address wtlist owner lklist type
tblsnum rowid key#/bsiz
4467a5b8 0 5c660110 0
HDR+S 100002 204 0
4467a638 0 5c661240 0
S 100002 204 0
4467acb8 0 5c660110 4467a5b8
S 100002 201 0
4467ad38 0 5c669328 0
HDR+S 100002 201 0
44681e38 0 5c6681f8 447b5838
HDR+X 40011f 102 0
447b2db8 0 5c6609a8 0
S 100002 204 0
447b3bb8 0 5c6681f8 447b43b8
HDR+X 400121 102 0
447b43b8 0 5c6681f8 44681e38
HDR+X 400121 101 0
447b5838 0 5c6681f8 447c32b8
HDR+X 40011f 101 0
447bd938 0 5c6681f8 0
HDR+S 100002 207 0
447c32b8 0 5c6681f8 447bd938
HDR+IX 40011f 0 0
11 active, 20000 total, 16384 hash buckets, 0 lock table overflows
*
The locks held by session owner at address *5c6681f8* belong to that
session. So, to see the data for the row locked by the lock at address *
447b3bb8*, which happens to be entirely text and which I know to be part of
table states in the database big_test, I would:

oncheck -pp big_test:states%4194593 258

Can't show you the output because this function seems to be broken in 11.70
which is the version of my local server. <sigh> Bleeding edge and all that.
Looks like I'll be opening another support case with IBM today.

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
IIUG Board of Directors (art@iiug.org)
Blog: http://informix-myview.blogspot.com/

Disclaimer: Please keep in mind that my own opinions are my own opinions and
do not reflect on my employer, Advanced DataTools, the IIUG, nor any other
organization with which I am associated either explicitly, implicitly, or by
inference. 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 Tue, Jan 4, 2011 at 10:43 AM, SHAHZAD SALAM KASI <skasi@i2cinc.com>wrote:

> Thanks for the help.
>
> But when we get the data using onstat -k command, we get rowid. How can we
> map
> this value to the Partitioned table row ?
>
> Thanks.
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--20cf30433efe42e614049907d853

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