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IDS Forum

RE: Light append partition after onpload

Posted By: Jerry Hamilton
Date: Tuesday, 22 January 2008, at 9:34 a.m.

In Response To: RE: Light append partition after onpload (Alexey Sonkin)

"10.0xC6 is a very problematic version of IDS. Avoid
using it."

Yikes! How problematic????? We're about to go into a
major upgrade with it...

--- Alexey Sonkin <alexeys@cidc.com> wrote:

> Hi, Jonah,
>
> I don't have a complete information, so I can just
> give some generic
> advices.
>
> 1. 10.0xC6 is a very problematic version of IDS.
> Avoid using it.
> Upgrade to xC7 or downgrade to xC5 (if you don't use
> HDR) or xC4.
> With xC6, make sure, that you have '
> VP_MEMORY_CACHE_KB 0' in your
> $ONCONFIG (or have it set to something like 20000,
> if you are familiar
> with this)
>
> 2. If you have a 'Passport Advantage' support
> contract, you are entitled
> to call IBM 24x7 'Advanced Support / System Down
> group'. In my opinion,
> this can be classified as 'system down' situation.
> Guys from Advanced
> Support can login into the system, make all the
> possible diagnostics,
> and, possibly, even perform binary fix of Informix
> disk structures.
>
> 3. Run oncheck's on problematic tables (-cc, -cI,
> -cD); dump 'oncheck
> -pT'
>
> 4. Verify, that you are doing Logical log backups
> properly
>
> 5. Check 'online.log' for any helpful information
>
> -Alexey
>
> -----Original Message-----
> From: ids-bounces@iiug.org
> [mailto:ids-bounces@iiug.org] On Behalf Of
> JOHAN BACKLUND
>
> Hi all. The other day I ran into trouble at a
> customer site running
> 10.00.TC6
> on Windows Server 2003. The database had been
> migrated and reorganized
> using
> onpload with overall success. At this point, an
> ontape level 0 was taken
> to
> file and then the customer started running some
> batches on their new
> shiny
> 10.00.TC6 installation.
>
> After the first set of batches, another ontape level
> 0 was taken before
> next
> set of batches were to be run. However, the second
> set of batches
> stopped on
> -242/-197 on one essential table. I tried a few
> other tables, and they
> returned the same error on INSERT/UPDATE actions.
>
> When I've seen this error in conjunction with
> onpload, it is because the
>
> express-mode load has used Light Appends to create
> new extents for the
> loaded
> data. To make these new extents updateable a level 0
> backup must be
> taken.
> This did not work in this case: I tried multiple
> level 0 backups
> combined with
> forcing logical log file switches and checkpoints
> just to make sure. No
> luck.
>
> Finally we gave up and restored to the first backup
> after the onpload. I
>
> checked the tables and had no trouble doing
> INSERT/UPDATE on them. We
> have not
> yet had the time to rerun the first set of batches
> to see if the problem
>
> reoccurs or not (as it is now I would be more happy
> if the same batch
> run
> fails in the same way...)
>
> Just to be clear: there were no onpload activities
> whatsoever after the
> first
> backup. The batches did insert a lot of data but
> this was done through
> Stored
> Procedures doing regular INSERT/UPDATE statements.
>
> I took a look at the information in
> sysmaster:sysptnhdr and noticed that
> many
> tables are still flagged as "Light Append Partition"
> (both before and
> after
> the first batch set run) and I have concluded that
> this flag is set when
> doing
> an express-mode load on a table.
>
> My questions: is there anything that should be done
> to tables after an
> express-mode load apart from taking a level 0
> backup? Does anyone know
> if the
> LAP flag affects table behaviour in any way? Can it
> be cleared by some
> operation?
>
> thanks for listening.
>
>
************************************************************************
>
> *******
> Forum Note: Use "Reply" to post a response in the
> discussion forum.
>
> See you at the IIUG Informix 2008 Conference
> The Power Conference for Informix Professionals
> April 27 - 30, 2008 Marriott Overland Park (Kansas
> City), Kansas
> http://www.iiug.org/conf
> Registration Now Open!!
>
>
>
*******************************************************************************
>
> Forum Note: Use "Reply" to post a response in the
> discussion forum.
>
> See you at the IIUG Informix 2008 Conference
> The Power Conference for Informix Professionals
> April 27 - 30, 2008 Marriott Overland Park (Kansas
> City), Kansas
> http://www.iiug.org/conf
> Registration Now Open!!
>

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