RE: Date bind variable being peeked, but not used for cardinality estimate

  • From: "Allen, Brandon" <Brandon.Allen@xxxxxxxxxxx>
  • To: Kerry Osborne <kerry.osborne@xxxxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx L" <oracle-l@xxxxxxxxxxxxx>
  • Date: Thu, 24 Sep 2009 11:59:10 -0700

Kerry,

Thanks for the pointer to the other_xml column - I actually just discovered 
that myself yesterday after some digging through the code for sqltxplain (a 
very nice utility for query tuning downloadable from Metalink 215187.1).  So I 
checked it yesterday as another confirmation that the bind variables are not 
being peeked (in addition to the "No bind buffers allocated" message I already 
found in the 10053 trace).  I didn't think to check for the 
_optim_peek_user_binds hint as you suggested, however I just checked that too 
and the hint is not present - so the mystery continues . . . (no response yet 
from Oracle on my SR, other than requesting the SQLTXTRACT output)

I love the scripts for creating the query test scripts with bind variables - 
very nice!

I also feel better after reading the article 
(http://jonathanlewis.wordpress.com/2008/07/24/bind-capture/) that you 
referenced in your blog where Jonathan Lewis confessed that he had also been 
under the same false impression as I was regarding v$sql_bind_capture and bind 
peeking.  At least I'm not the only one that made the wrong assumption there :-)

Thanks!
Brandon



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