|
Well, that IS true (actually I think
its NOLOGGING for index creation). But if you have massive amounts of
INSERTS or DELETES, dropping the index first and then re-creating can
help.
If the number of deletes is truly
large, and you've got spare disk space, and the table can be off-line for a
while, you might try CTAS (create table as select) using UNRECOVERABLE, to make
a second copy of the table with just the rows you want to keep. Then drop
or rename the old table, rename the new table, and re-create the indexes with
NOLOGGING. In removing 3 million rows from a 9 million row table this
method was very fast compared to DELETE.
Jim
>>> [EMAIL PROTECTED] 06/28/01 10:58AM
>>>
Yes that is right.
rgds
amar
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 28, 2001 6:25 PM
To: Multiple recipients of list ORACLE-L
Subject:
Re: Speed up massive delete
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
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06/28/01 |
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>-------------------------------------------------------------------|
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To: Multiple recipients of list
ORACLE-L
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<[EMAIL PROTECTED]>
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cc: (bcc: Mike
Hately/ETECH)
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Subject: Re: Speed up massive
delete
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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
m�֪m
>>> [EMAIL PROTECTED] 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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