OPEN_CURSORS is not an Instance-wide statistic. However, there can
be applications
where a session has many open cursors -- 300 is high already but you
could take it higher, 500 or 1000.
SESSION_CACHED_CURSORS is a different parameter, again not being
Instance-wide.
It really depends on how many SQL Cursors would a session need.
See
http://www.ixora.com.au/scripts/library.htm
Tom Kyte provides an explanation at
See
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:1041031921901
open_cursor -- how many concurrently opened cursors you can
have.
session_cached_cursors -- how many cached CLOSED cursors you can have.
it is hard to explain a relationship where none really exists...
The only
relationship they really have is -- they both have cursors at the end of
their
name....
Consider:
ops$tkyte@ORA920> show parameter _cursors
NAME
TYPE VALUE
------------------------------------ -----------
------------------------------
open_cursors
integer 50
session_cached_cursors
integer 100
that means, "you cannot have more then 50 open at the same
time - but we
might cache 100 of them for you off to the side..."
At 09:21 AM Tuesday, Wolfson Larry - lwolfs wrote:
Paula,
I
heard after upgrading to 9.2.06 session_cached_cursors replaced
open_cursors.
Anybody else hear that?
Larry
Wolfson
From: oracle-l-bounce@freelists.org
[
mailto:oracle-l-bounce@freelists.org] On Behalf Of
Paula_Stankus@doh.state.fl.us
Sent: Monday, October 17, 2005 3:04 PM
To: oracle-l@freelists.org
Subject: RE: increasing open_cursors from 300 to 3000
We are running with about 500
concurrent users.
O racle Version 9.2.0.6
Solaris 2.9
0RA-1000 "Too many open cursors" error when selecting from a
sequence over a dblink.
Metalink Note:238407.1 describes the error and indicates that the bug id
is corrected in 9.2.0.3 and later. We're running 9.2.0.6.
A
nyone have any advice or head's up when increasing open_cursors
significantly. I would think that if these open cursors are used
then there might be memory issues.
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Received on Tue Oct 18 2005 - 00:14:15 CDT
