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IDS Forum

RE: HPL failpoint: 15902 while attempting hplu....

Posted By: Justin Killen
Date: Thursday, 6 June 2013, at 4:50 p.m.

In Response To: Re: HPL failpoint: 15902 while attempting hplunloa (Clifton Bean)

Thanks - I'll add the onstat -g seg to the backup script and start tracking the segments. Hopefully after a few weeks I can confirm the correlation between the segment usage and the failures, then be able to take corrective action.

An upgrade to 12.1 is in the works already for later this year (migrating over to new hardware, etc), we're just trying to keep the old system up and running until migration day.


-----Original Message-----
From: [] On Behalf Of Clifton Bean
Sent: Thursday, June 06, 2013 9:52 AM
Subject: Re: HPL failpoint: 15902 while attempting hplu.... [30444]

I suggest performing an onstat -g seg to see how many virtual (V) memory
segments you have each day and how many you have when the issue occurs. I
suspect you will find multiple segments on the latter and perhaps the other
times as well.

If multiple segments exist, you may want to increase your SHMVIRTSIZE to
encompass these segments and/or increase SHMADD to make obtained segments
larger. You also might want to schedule several onmode -F commands during
non peak times to release no longer needed segments.

Lastly, I would, at a minimum, upgrade to the latest version of your
current engine.

Hope this helps.

On Thu, Jun 6, 2013 at 5:02 PM, Justin Killen <> wrote:

> Hi,
> We do nightly unloads via hplunload. In the script that runs, we drop
> yesterday's project, then create the project and jobs for each table. This
> works fine the majority of the time, but sometimes we get the following
> error
> (which repeats for each table):
> Failed to determine shared memory base address.
> Set PLOAD_SHMBASE to appropriate value for PLOAD to work.
> HPL failpoint: 15902
> After the unloads, we also do a level 0 backup, which also fails:
> /usr/informix/bin/ontape -v -s -L 0 -d -t STDIO 1>
> /dbbackup/backupdb/ontape/fullsize/
> 23:56:56 shmat: [22]: operating system error
> 23:56:56 Client could not attach server shared memory segment, use
> Server is in an incompatible state or user authentication failed.
> The failures happen about once a week. I have neither PLOAD_SHMBASE nor
> IFX_XFER_SHMBASE in my onconfig or environment variables, so I'm confused
> as
> to why it would complain about this sometimes but not others.
> For reference, this database is running Informix 11.1 on AIX 5.3
> Thanks in advance,
> -Justin
> Forum Note: Use "Reply" to post a response in the discussion forum.

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