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IDS Forum

Re: Re: Performance issue after 732 to 94fc6 upgra

Posted By: Art S. Kagel
Date: Tuesday, 13 June 2006, at 9:49 a.m.

In Response To: Re: Performance issue after 732 to 94fc6 upgrade p (Doug Fossmeyer)

See below:

> ----- Original Message -----
> From: Doug Fossmeyer <ids@iiug.org>
> At: 6/12 20:13:55
>
>
> Part 2 of posting
>
> onstat -c
>
> IBM Informix Dynamic Server Version 9.40.FC6 -- On-Line -- Up 2 days
> 19:54:35
> -- 2325280 Kbytes
> <SNIP>
> TBLSPACE_STATS 0 # Maintain tblspace statistics

Set TBLSPACE_STATS to 1, the cost is minimal and it will tell you about
host spots.

> <SNIP>
> NETTYPE ipcshm,2,100,CPU
> NETTYPE soctcp,2,100,NET

You have 3 CPU VPs configured but only have ipcshm pollers in 2 of them,
use all 3 unless shared memory connections are rare.

> #NETTYPE ipcshm,4,250,CPU
> DEADLOCK_TIMEOUT 120 # Max time to wait of lock in distributed env.
> RESIDENT

> # Forced residency flag (Yes = 1, No = 0)

What's this? RESIDENT has only a small number of valid settings, and
2^32-1 is not one of them. Possible settings:
RESIDENT -1 -- Set all resident and virtual segments as memory resident
in the OS
RESIDENT 0 -- Set all segments swapable including the 'resident'
segment containing BUFFERS
RESIDENT >0 -- Number of VIRTUAL segments in addition to the 'resident'
segment to mark as memory resident in the OS.

While the last setting would seem to indicate that setting it to allow
4billion and perhaps if that wraps in memory it MIGHT actually be a
setting of -1, I wouldn't trust that value.

> <SNIP>
> CLEANERS 8 # Number of buffer cleaner processes
> <SNIP>
> LRUS 128 # Number of LRU queues

I have found that you almost always want CLEANERS to be set >= LRUS for
best checkpoint performance and best LRU flush performance at peak load,
of which batch jobs are sometimes the instigators.

> <SNIP>
> # Read Ahead Variables
> # was 16 and 8, using Belevue settings for test
> RA_PAGES 32 # Number of pages to attempt to read ahead
> RA_THRESHOLD 30 # Number of pages left before next group

I don't like setting the RA_PAGES and RA_THRESHOLD so close together.
With modern, fast, cached disks, controllers, and SANs it's
unneccessary. Try 32 and 16.

> # DBSPACETEMP:
> # OnLine equivalent of DBTEMP for SE. This is the list of dbspaces
> # that the OnLine SQL Engine will use to create temp tables etc.
> # If specified it must be a colon separated list of dbspaces that exist
> # when the OnLine system is brought online. If not specified, or if
> # all dbspaces specified are invalid, various ad hoc queries will create
> # temporary files in /tmp instead.
>
> #DBSPACETEMP # Default temp dbspaces
> DBSPACETEMP tempdbs6:tempdbs7:tempdbs8:tempdbs9:tempdbs10:ifasdbs94temp

You should have a few (3+) non-temp dbspaces listed in DBSPACETEMP for
use in creating logged temp tables. Otherwise all of those are being
written to ROOTDBS which can cause contention.

> <SNIP>
> # Parallel Database Queries (pdq)
> MAX_PDQPRIORITY 10 # Maximum allowed pdqpriority
> DS_MAX_QUERIES 2 # Maximum number of decision support queries
> DS_TOTAL_MEMORY 17392 # Decision support memory (Kbytes)
> DS_MAX_SCANS 20 # Maximum number of decision support scans

Setting MAX_PDQPRIORITY so low will prevent you from using high
PDQPRIORITY settings to update statistics and build indexes quickly!
I'd raise it to 100 and include PDQPRIORITY=10 in /etc/profile.

Increase DS_TOTAL_MEMORY so you can have more sort memory when using
PDQPRIORITY>0 to update statistics and build indexes quickly! As it's
set now you are getting DS_TOTAL_MEMORY/DS_MAX_QUERIES or ~8MB for
sorting. Non-PDQ sorts get 15MB be default and can get up to 50MB using
DBUPSPACE. Likewise for DS_MAX_QUERIES. If you have the memory to
use, allocate up to 1GB to DS_TOTAL_MEMORY and use DS_MAX_QUERIES to
limit the memory any single query can use.

> DATASKIP off
> # OPTCOMPIND
> # 0 => Nested loop joins will be preferred (where
> # possible) over sortmerge joins and hash joins.
> # 1 => If the transaction isolation mode is not
> # "repeatable read", optimizer behaves as in (2)
> # below. Otherwise it behaves as in (0) above.
> # 2 => Use costs regardless of the transaction isolation
> # mode. Nested loop joins are not necessarily
> # preferred. Optimizer bases its decision purely
> # on costs.
> OPTCOMPIND 1 # To hint the optimizer

Don't know your apps, but most OLTP shops prefer OPTCOMPIND set to 0
while DSS & DW servers function better set to 2.

> <SNIP>
> VPCLASS CPU,num=3,aff=1-3,noage
> VPCLASS AIO,num=4,aff=0-3,noage

The stats may be for too short a period, but keep an eye. The onstat -g
iov indicates that you may be able to get away with only 2 or 3 AIO VPs.

> SNIP>
> 46 ifasdev2dbspyt3 990414 990414 0 4.1

This disk is a potential hot spot, albeit a mild one. Keep an eye on it.

<SNIP>

Art S. Kagel

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