RE: Pinning/keeping plans in shared pool - using dbms_advanced_rewrite with query > 2499 characters
- To: "Alex Gorbachev" <gorbyx@xxxxxxxxx>
- Date: Mon, 10 Jul 2006 13:31:34 -0700
Okay, I found a problem around that - I broke it up into smaller chunks
and concatenated them together, e.g.:
begin
dbms_advanced_rewrite.declare_rewrite_equivalence( name => 'my_query',
source_stmt => 'select blah blah blah' ||
'from blah blah blah',
destination_stmt => 'select /*+ RULE */ blah blah blah' ||
'from blah blah blah',
validate => false
rewrite_mode => 'GENERAL');
end;
But, now I'm getting the following error:
ORA-30394: source statement identical to the destination statement
Apparently it ignores differences in hints/comments because I added a
RULE hint to the second query. So, I'll have to make some other
modification in order for it to accept my query rewrite and try again.
A few other things to note:
1) I made a typo in my previous email - the procedure is
"declare_*rewrite*_equivalence" not declare_query_equivalence.
2) There is a documentation bug on this - it says that the 4th argument
to the procedure is "mode", but it is actually "rewrite_mode"
Regards,
Brandon
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Allen, Brandon
Sent: Monday, July 10, 2006 1:10 PM
To: Alex Gorbachev
Cc: oracle-l@xxxxxxxxxxxxx
Subject: RE: Pinning/keeping plans in shared pool - using
dbms_advanced_rewrite with query > 2499 characters
I'm trying to use dbms_advanced_rewrite.declare_query_equivalence, but
getting error "SP2-0027: Input is too long (> 2499 characters)" because
the query is about 6000 characters. Anyone know of a way around this?
Thanks,
Brandon
-----Original Message-----
From: Alex Gorbachev [mailto:gorbyx@xxxxxxxxx]
Sent: Saturday, July 08, 2006 12:06 AM
To: Allen, Brandon
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: Pinning/keeping plans in shared pool
I just though that it might be useful to check on DBMS_ADVANCED_REWRITE
package and see if you can use it to incorporate certain hints that can
make parsing fast.
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