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IDS Forum

RE: App unable to use deleted rows

Posted By: Michaelis, Daniel
Date: Tuesday, 9 August 2005, at 2:10 p.m.

In Response To: App unable to use deleted rows (JOHN WHITTENBERGER)

John,

It's been a while, but I think that my experience is still valid.

In Informix (and most other RDBMS platforms), space is allocated to tables
in contiguous pages called extents. The trick is that once an extent is
allocated to a table, that extent remains allocated to the table, even if
through a delete operation, there is no more data present in the extent.
This doesn't mean that the space is unusable; it means that the space is
pre-allocated for that particular table (or index, or other structure).
Typically, you run into problems with this kind of thing if your developers
are creating real (not temporary) tables, populating them with lots of
transient data (for example, a data load from an ETL operation), and then
deleting that data. This is all well and good if the same table is used
over and over again, but if each operation creates a separate table, all of
the extents allocated to the previous table remain allocated, and thus
consume the space in your dbspace.

If this kind of scenario is NOT what's happening with your application, let
me know what's going on with the app, and I'll see if I can take another
guess.

Thanks.

Dan Michaelis

Database Administrator/Developer
eOriginal
351 West Camden Street
Suite 800
Baltimore, MD 21201

410.625.5187 (phone)
410.659.9799 (fax)


-----Original Message-----
From: JOHN WHITTE.... [mailto:john.whittenberger@metnet.navy.mil]
Sent: Tuesday, August 09, 2005 11:28 AM
To: ids@iiug.org
Subject: App unable to use deleted rows [5587]

9.30.UC5 on Solaris 8

A C++ application has it's own idx and dbs spaces and is unable to
reclaim/reuse space from deleted rows. This causes the spaces to
fill over time. The programmer says that this occurs because 'update
statistics' must be run periodically on the database. He is building
'update statistics' into his application so space will be reclaimed in
the dbspaces.

I've never seen a database behave this way. I looked at my docs and
'Informix IDS Unlocking the Mysteries Behind Update
Statistics' John F. Miller III, and found no mention of 'update
statistics' in this context. I also find no info about reclaiming space
being a problem in any context.

Has anyone seen this problem? What kinds of things should I look for in
the code?

Thanks,

John

Messages In This Thread

  • App unable to use deleted rows
    JOHN WHITTENBERGER -- Tuesday, 9 August 2005, at 11:28 a.m.
    • RE: App unable to use deleted rows
      Michaelis, Daniel -- Tuesday, 9 August 2005, at 2:10 p.m.

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