Re: Latch Free / Shared Pool on Fetch
- From: "Jonathan Lewis" <jonathan@xxxxxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Sat, 3 Jul 2004 11:07:07 +0100
Just a couple of guesses
Do you have cursor_sharing set to force or similar ?
Is there a pl/sql function call or globally packaged
variable in the SQL statement ?
Does the statement reference sys_context()
Regards
Jonathan Lewis
http://www.jlcomp.demon.co.uk
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----- Original Message -----
From: "Larry Elkins" <elkinsl@xxxxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
Sent: Wednesday, June 30, 2004 11:35 PM
Subject: Latch Free / Shared Pool on Fetch
Maybe a simple question, but I cannot find the answer, and I've been looking
for 24 hours now ;-)
Why is a shared pool latch taken when (between?) fetching rows from a query?
I have a trace file where once we start hitting the fetch lines, we are
seeing latch free waits on the shared pool (9.2.0.5, p2 of 156=shared pool).
#8 is the select statement, #1 is the begin ... end of the anonymous block
associated with "execute package.proc".
FETCH #8:c=0,e=99,p=0,cr=0,cu=0,mis=0,r=1,dep=1,og=4,tim=684296371
WAIT #1: nam='latch free' ela= 138809 p1=60175956 p2=156 p3=0
FETCH #8:c=0,e=91,p=0,cr=0,cu=0,mis=0,r=1,dep=1,og=4,tim=684503268
WAIT #1: nam='latch free' ela= 207973 p1=60175956 p2=156 p3=0
FETCH #8:c=0,e=94,p=0,cr=0,cu=0,mis=0,r=1,dep=1,og=4,tim=684779497
WAIT #1: nam='latch free' ela= 138264 p1=60175956 p2=156 p3=0
WAIT #1: nam='latch free' ela= 70925 p1=60175956 p2=156 p3=1
FETCH #8:c=0,e=107,p=0,cr=0,cu=0,mis=0,r=1,dep=1,og=4,tim=685059389
WAIT #1: nam='latch free' ela= 207427 p1=60175956 p2=156 p3=0
WAIT #1: nam='latch free' ela= 68432 p1=60175956 p2=156 p3=1
FETCH #8:c=0,e=97,p=0,cr=0,cu=0,mis=0,r=1,dep=1,og=4,tim=685402671
WAIT #1: nam='latch free' ela= 278221 p1=60175956 p2=156 p3=0
FETCH #8:c=0,e=93,p=0,cr=0,cu=0,mis=0,r=1,dep=1,og=4,tim=685747413
WAIT #1: nam='latch free' ela= 209616 p1=60175956 p2=156 p3=0
WAIT #1: nam='latch free' ela= 69029 p1=60175956 p2=156 p3=1
Anyway, it's just something I don't think I've seen before, and I haven't
been able to get an answer on why this occurs. Note that if I take the SQL
and run it just as SQL, then the cursor referenced by the FETCH and WAIT
lines are the same value.
Regards,
Larry G. Elkins
elkinsl@xxxxxxxxx
214.954.1781
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