Re: Delete performance

From: <Rajesh.Rao_at_jpmchase.com>
Date: Thu, 01 Aug 2002 09:18:30 -0800
Message-ID: <F001.004A9034.20020801091830@fatcity.com>

Dont use a PL/SQL cursor and loop, when bulk deletes are a possibility.

Delete from table where rownum < 1000;
commit;
Delete from table where rownum < 1000;
commit;

.....................................................

I would prefer this approach. 200000 is not much. With a create table as you suggest, a lot of things to take care of. Viz. grants, rename, rebuild indexes, space, backup after the creation, drop the old table, drop indexes, et all.

Raj

                                                                                                                    
                    Gurelei                                                                                         
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Hi all:

Someone at my shop wants to delete about 20% of roes in a table (200000 rows out of a million). He wants to set a commit frequency (like every 1000 records or so)
to keep the rbs under control. I am not aware of any easy way to do it other then writing a procedure, but I may be missing something here. Is there any simple way to accomplish this?

Also I have suggested instead of deleting 20% of the rows, create a new table as a select and insert the rest of the rows into it (then rebuild the indices and rename). This can be done in nologging mode, without redo logs and rbs segments. Is this a good idea to try?

thanks for any info

Gene

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  INET: Rajesh.Rao_at_jpmchase.com

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