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IDS Forum

Re: Question on tuning

Posted By: Marcus Haarmann
Date: Tuesday, 2 May 2017, at 8:34 a.m.

In Response To: Re: Question on tuning (LARRY SORENSEN)


Some hints:

first thing is to look at the database itself.
How was the transfer to the new machine done ?
Do you just link to the same DBSpaces on a SAN ? Or was there a kind
of backup/restore process or unload/load ?
Did you upgrade to a newer version ?
What about your statistics ?
Are the chunks created the same way as on the old machine (e.g.
did you work with raw chunks on the old machine and now you might have cooked files ?)
In case you activated a newer IDS release: did you run "update statistics low drop distributions" ?
Are your tables/indexes on dbSpaces with same page size as before (if not: do you have a bufferpool for the new page size ?)
Monitor the checkpoints using onstat -g ckp
Check the Caching using onstat -p
Are the indexes balanced or does the background btree scanner very active (check onstat -C output)

Next look at the queries:
You should check the query behaviour by using "set explain on" (which can be done dynamically
using onmode -Y <sid> 1|2)
This will produce a detailed output about the query plans. Look for sequential scans where you
do not expect sequential access (statistics are wrong or an index is maybe missing or
a foreign key constraint is missing).

Look at the machine:
Check your I/O using iostat (or whatever the command is on Solaris)
What partitions (chunks) are busy during checkpoints or when the program is running ?
Do you have read or write activity to search for ?
Check the disk access using dd command

Marcus Haarmann

An: "ids" <>
Gesendet: Dienstag, 2. Mai 2017 14:06:37
Betreff: Re: Question on tuning [39075]

What are some of the commands that I can use to monitor on a regular basis?

From: <> on behalf of Fernando Nunes
Sent: Tuesday, May 2, 2017 4:29 AM
Subject: Re: Question on tuning [39071]

Unfortunately tuning is not that simple... Typically and in abstract we
could consider performance to depend on three factors:
- Memory
- I/O

Apparently CPU became more idle and I assume the memory is equal or higher
and the use is the same.
So, in a blind shot I'd say you may have an I/O problem. But keep in mind
that I'm just trying to simplify what I begun to say it's not "that simple".
So, you really need to do more monitoring and identify where's the


On Tue, May 2, 2017 at 4:37 AM, LARRY SORENSEN <> wrote:

> Solaris 10
> IDS 11.50.FC5 Workgroup
> SPARC 64 bit
> I have two servers, one older server and one newer server. The newer
> server is
> obviously more powerful.
> I have an involved process that processes user records on the server. The
> process uses mostly Java to connect to the database to process records. The
> Java application runs on the database server itself.
> The onconfig files are identical on both servers with the exception of the
> I have set up projects on both servers specifying max-shm-memory,
> max-file-descriptor, etc. that are identical for the kernel parameters.
> On the old server, we could depend upon 80-100 record transactions to be
> processed per hour. During that time the server CPUs would remain 15%-25%
> idle
> (so almost to capacity).
> On the new server, we are seeing 25-35 record transactions being processed
> per
> hour and the server CPUs remain 95%-98% idle.
> What are some tuning parameters and things we can look at and tweak to help
> the new server reach its potential, or at least process as fast as the
> older
> server?
> Larry
> ************************************************************
> *******************
> Forum Note: Use "Reply" to post a response in the discussion forum.

Fernando Nunes


Informix Technology<>
IBM and HCL entering a strategic partnership to jointly develop and market the
IBM Informix family of products (original version here:
http://informix-technology ...

My email works... but I don't check it frequently...


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