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IDS Forum

Re: One temp space fills and 4gl fails

Posted By: Art S. Kagel (Oninit LLC)
Date: Wednesday, 6 February 2008, at 1:57 p.m.

In Response To: RE: RE: One temp space fills and 4gl fails (George Palmer)

George Palmer wrote:
> Brian,
>

George, Brian:

Implicit temp tables are always fragmented round robin across all of the
appropriate temp dbspaces. NOTE the word 'appropriate' here. By
default all temp tables are LOGGED which means that they cannot be
created in temp dbspaces but only in logged dbspaces. If there are ONLY
temp dbspaces in DBSPACETEMP then they will be created in the ROOTDB
space which is normally small and easily and quickly filled. In 11.10
and later (soon enough) you can change the default behavior to specify
that temp tables default to WITHOUT LOG behavior with an environment
variable.

Explicit temp tables are created either where you tell them to be
created. However, if no IN clause is specified, and they are LOGGED
then like any other CREATE TABLE they'll default to the database's home
dbspace or ROOTDB (I forget and don't have time to look it up right now)
but are NOT fragmented at all.

Art S. Kagel

> Informix does not create fragmented temp tables unless directed to do so
> (explicit table create statement for temp tables). Temporary tables are
> create in a single DBSpace (This has been true from version 7 through
> version 10, I am uncertain about version 11 I have not attempted any
> temp table operation in version 11 as yet).
>
> When the manual speaks about creating temp tables in round robin fashion
> it is refers to the fact that the first temp table goes into the first
> dbspace then next goes in the next dbspace...
>
> It is working the way I would expect it to work. Depending on how you
> created the temp table, you could fragment the table via the SQL used to
> create it. If you are not using the power of parallelization in your
> application (setting PDQ, having fragmented tables ...) then having
> multiple tempDBS may not be beneficial to you.
>
> George
>
>

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