Comments on: How long is my query being executed? http://dioncho.wordpress.com/2009/05/02/how-long-is-my-query-being-executed/ We are natural born scientists Fri, 17 Dec 2010 18:43:21 +0000 hourly 1 http://wordpress.com/ By: Dion Cho http://dioncho.wordpress.com/2009/05/02/how-long-is-my-query-being-executed/#comment-431 Fri, 11 Sep 2009 01:05:32 +0000 http://dioncho.wordpress.com/?p=617#comment-431 More research clearly showed that even index creation on text should appear in the V$SESSION_LONGOPS view while it is reading data with full table scan.

One thing you should investigate is the size of the table. For full table scan, Oracle registeres it to the V$SESSION_LONGOPS view only when the table size over 10,000 block.

]]> By: Tim http://dioncho.wordpress.com/2009/05/02/how-long-is-my-query-being-executed/#comment-428 Thu, 10 Sep 2009 08:52:34 +0000 http://dioncho.wordpress.com/?p=617#comment-428 I use the ORACLE TEXT feature in order to index and search pdf documents. The CREATE INDEX statement is:
‘CREATE INDEX text_index ON pdfs(pdf) INDEXTYPE IS CTXSYS.CONTEXT’ – but there doesn’t appear any entry in V$SESSION_LONGOPS.

]]> By: Dion Cho http://dioncho.wordpress.com/2009/05/02/how-long-is-my-query-being-executed/#comment-427 Thu, 10 Sep 2009 08:42:47 +0000 http://dioncho.wordpress.com/?p=617#comment-427 Tim.

CREATE INDEX would do table full scan or index fast full scan, which would be reported via V$SESSION_LONGOPS view. Yes, index creation itself is not appear but all you get would be table full scan/index fast full scan operation.

But I have no idea why your long-running index creation session does not appear on that view. Do you have any unusual things with your job?

Regards.

]]> By: Tim http://dioncho.wordpress.com/2009/05/02/how-long-is-my-query-being-executed/#comment-426 Thu, 10 Sep 2009 08:04:52 +0000 http://dioncho.wordpress.com/?p=617#comment-426 Hello,

I’ve got a CREATE INDEX statement that takes several minutes, but the task isn’t reported by v$session_longops. Is is possible to make ORACLE display a db operation in that view?

]]> By: Dion Cho http://dioncho.wordpress.com/2009/05/02/how-long-is-my-query-being-executed/#comment-424 Thu, 03 Sep 2009 01:53:40 +0000 http://dioncho.wordpress.com/?p=617#comment-424 ABCD. :)

V$SESSION_LONGOPS view has some restrictions as explained here.
http://www.gplivna.eu/papers/v$session_longops.htm

But still, it’s a nice try to examine V$SESSION_LONGOPS view.

]]> By: abcd http://dioncho.wordpress.com/2009/05/02/how-long-is-my-query-being-executed/#comment-423 Wed, 02 Sep 2009 20:52:13 +0000 http://dioncho.wordpress.com/?p=617#comment-423 Would’nt the v$session_longops serve the purpose to track elapsed time of long running queries?

]]> By: Yas http://dioncho.wordpress.com/2009/05/02/how-long-is-my-query-being-executed/#comment-203 Mon, 04 May 2009 13:43:13 +0000 http://dioncho.wordpress.com/?p=617#comment-203 Dion, v$transaction.start_time may not show when the last dml statement started, it shows the start time of the transaction, the transaction may have been started with a different dml.

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