Hi Ray
Thanks for the reply . Yes , when we going to delete those records , CPU is
going high.So then its effecting to the performance. as i beginner in perl ,
how can i implement multi-threaded env ? Can you help me further ?
Thanks & Regards
Luke
________________________________
From: Raymond Wan <r....@aist.go.jp>
To: luke devon <luke_de...@yahoo.com>
Cc: Perl <beginners@perl.org>
Sent: Monday, August 17, 2009 14:12:27
Subject: Re: delete 20 000 records in oracle from perl
Hi Luke,
luke devon wrote:
> I wanted to delete some unwanted data in one of my oracle
> database.20 000 of records are there. This is actually on production .
> manually to delete a record , it takes 2 mins of time.
> So now i decided to write a perl script to do this function
> by learning on the web. Can somebody give me a exact guide to delete
> that amount of data , without giving any impact for performance of the
> database and i would like to ask what is the better way to do such a
> execution ?
> Do we have to implement more threads ?
Perhaps I'm misunderstanding the problem, but if you would like to remove
20,000 records in an Oracle database, I don't believe that Perl will help you
with that. It seems that you're already doing everything in a single SQL
statement; having Perl do it won't give you much added benefit (i.e., no
matter how you do it, you still have 20,000 records to delete). If these
records don't overlap, then you could consider a multi-threaded approach...I
guess.
Another suggestion if this is a production server is to mark records as stale
rather than deleting them (i.e., add a boolean flag as another column). And
then, when the server is least busy, delete the marked records. Or, rather
than a boolean flag, assign some number (say, from 0 to 9) and periodically
delete a portion of the rows...sort of like how log files are handled [delete
the oldest ones].
I presume your problem is that deleting 20,000 in one go is slowing down the
Oracle server?
Ray
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