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IDS Forum

Re: VERY slow BTS index build

Posted By: Mark Ashworth
Date: Wednesday, 10 September 2014, at 10:18 a.m.

In Response To: Re: VERY slow BTS index build (MICHAEL HOFFMAN)

Hi Michael,

BTS is based on CLucene which is an open source package and it does alot
of reads and write to build the index. Its a full text index which is
fair bit more complicated to build than a BTree or even an RTree index.
You can expect a large number of reads and writes on the sb temp. I have
11.50.FC6 on solaris now and and the index create took significantly
longer (12 hr for me). and it only had created 6 VX memory segments (used
by BTS) with EXTSHADD set to 8192, I do not know how or why you are
getting so many segments created. I have not seen this in connection with
BTS.

I am not aware of any affects of on BTS by the PDQ settings since BTS is
not parallizable. It does not use any sorting facilities in the server
either. As Art reported multi index scan are not supported in 11.50, but
even going forward, the server does not support multiindex scans for VII
based indexes like BTS (or RTree) so I have not seen any effects between
the MULTI_INDEX_SCAN and BTS.

As I said in an earlier email, there we some performance defects applied
to BTS in fixpacks after 11.50.xC6. Are you able to try the latest fixpack
for 11.50?? If that works, can you upgrade? If not , it may be time to
open a PMR with support for this issue and asked the support to discuss it
with me.

-- Mark.
Mark Ashworth
IBM Informix Extensibility Architect
Office phone: +1 (905) 413-5033
Alternate: +1 (905) 697-8094
Email: ashworth@ca.ibm.com
Check out my blog

From: "MICHAEL HOFFMAN" <mrh@panix.com>
To: ids@iiug.org,
Date: 09/09/2014 01:57 PM
Subject: Re: VERY slow BTS index build [33758]
Sent by: ids-bounces@iiug.org

Retry with Kate & Art's suggestions. Seems to be similar results. BUT also

discovered something else that might shed light:

Informix 11.5.FC6 running on a Sun Solaris 10 system.
PDQ set to 100. PSORT_NPROCS = 8.

changes to onconfig:
MULTI_INDEX_SCAN 0
VP_MEMORY_CACHE_KB 819200 (used 40% of 2GB, although SHMTOTAL is 0)

Bounced the engine and kicked off the script. Made one adjustment: I am
reading the column values into a temp table to put them in memory first.
Would
that work? Looks like NO.

As soon as the index build starts, 3 new extension segments are added; a
4th
and 5th added 2 and 5 minutes later. :-(

The interesting thing is the results of onstat -D:
For the read into temp table, the database dbspace gets 250 reads.
For the index build, after 7 minutes, the same space is over 30000 reads!

Mike

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