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IDS Forum

Re: Unused Index Search

Posted By: John Miller iii
Date: Friday, 14 December 2012, at 11:34 a.m.

In Response To: Re: Unused Index Search (JACQUES RENAUT)

Just to clarify a little more. In version 11 for detached indexes you
have some additional information. First you have the partitions
stats in onstat -g ppf of sysmaster:sysptprof which have the isread,
iswrite and isdelete which will be populated for each index item
selected, inserted and deleted.

The other place I would look is onstat -C part. This will show you
how many times we have used an index to position on a specific
index item, along with index compress (combining pages)
and splits pages.

John F. Miller III
STSM, Embedability Architect wrote on 12/13/2012 01:59:34 PM:

> From: Jacques Renaut/Lenexa/IBM@IBMUS
> To:
> Date: 12/13/2012 02:02 PM
> Subject: Re: Unused Index Search [29077]
> Sent by:
> Original post:
> I'm looking at index usage and have a question about onstat -g ppf
> It has both a "Reads" and "Buffer Reads" column. I have some indexeswith
> "Reads" but, in a few cases, many thousands (and even millions) of
> Reads".
> This doesn't make much sense to me if I assume "Buffer Reads" are a
subset of
> "Reads", which I expect to be the sum of disk+buffer) I have to
> this logic isn't right.
> So, the question is, why are Buffer Reads > 0 when Reads are = 0, and are

> these really in use.
> This is 11.70.FC2.
> Response:
> Ok, in a quick test that I did (on 11.50.FC9 was the first server I
> found that
> I had up already). I found the isrd column appeared to only be bumped if
> used a query that actually used the index (it would bump both isrd and
> bfrd's). However, if I just inserted a row into the table, it has
toinsert a
> item into the index, and in that case, bfrd + bfwrt + iswrt would get
> So my quick testing would seem to show that if you have an index butthe
> isn't getting used for any queries, isrd wouldn't be getting bumped, but
> bfrd's would if you are inserting/updating/deleting rows (well updates
> would update the indexed column).
> All I did to test this was create a table (2 columns) with 1 detached
> (on 1 of the 2 columns). Get the hex partnums, inserted a couple
> rows into the
> table. Zero'd out my stats with onstat -z. Then used set explain and ran
> query that I believed would use the index I had. After running,
> checked onstat
> -g ppf. Zero'd stats, then ran a sequential scan (verifying in my set
> output that the index was used or not in both the above cases). Checked
> stats. Zero'd stats, and then inserted another row...checked stats.
> Jacques Renaut
> IBM Informix Advanced Support
> APD Team

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

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