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Home -> Community -> Mailing Lists -> Oracle-L -> Re: Speed up massive delete
Mike,
When you insert data into a table redo logs are written for both the data info and
the index info. If the index is created as unrecoverable then the redo log and archive
log info is not written. That is where the time savings is derived from.
During my daily load of my tables (approx 200000 rows, 13 tables ,40 + indexes) the
redo log generation and archivelog generation has decreased twice fold.
Of course you should take a back up of your data and indexes after the work is
completed.
Time is saved during the IMP of the data also if the indexes are unrecoverable and or
you EXP with index=N.
>>> MHately_at_etech-uk.com 06/28/01 10:24AM >>>
Ron,
How does creating indexes as UNRECOVERABLE save time when you insert data?
As far as I'm aware the only operation it will save time on is the initial
creation.
Regards,
Mike
|--------+-----------------------> | | "Ron Rogers" | | | <RROGERS_at_galo| | | ttery.org> | | | | | | 06/28/01 | | | 02:51 PM | | | Please | | | respond to | | | ORACLE-L | | | | |--------+-----------------------> >-------------------------------------------------------------------| | | | To: Multiple recipients of list ORACLE-L | | <ORACLE-L_at_fatcity.com> | | cc: (bcc: Mike Hately/ETECH) | | Subject: Re: Speed up massive delete | >-------------------------------------------------------------------|
Jack
Drop the indexes first before you do the deletes will save you time by not
creating logs for the indexes being deleted. On my large activity files I have
created the indexes as "Unrecoverable" saving time when I add data or delete
data.
ROR mªÖªm
>>> nlzanen1_at_EY.NL 06/28/01 05:45AM >>>
Hi All,
I have to do some pretty big deletes on a test environment and they are
estimated to take for ever.
Are there any options to speed it up?
Jack
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