| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
 |
 | |||
| Oracle FAQ | Your Portal to the Oracle Knowledge Grid | |
|
| |||
Home -> Community -> Mailing Lists -> Oracle-L -> RE: When optimizer reevaluate SQL statement
!! Please do not post Off Topic to this List !!
If the statement is not exactly the same, the new statement will be reparsed.
If you are executing it under a different user the statement will be reparsed.
If you drop/create an index, it will invalidate the explain plan if that was part of the chosen path.
I believe statistics also invalidates the plans as well, but not 100% sure on that.
"Do not criticize someone until you walked a mile in their shoes, that way when you criticize them, you are a mile a way and have their shoes."
Christopher R. Spence
Oracle DBA
Phone: (978) 322-5744
Fax: (707) 885-2275
Fuelspot
73 Princeton Street
North, Chelmsford 01863
-----Original Message-----
Sent: Thursday, September 13, 2001 8:11 PM
To: Multiple recipients of list ORACLE-L
!! Please do not post Off Topic to this List !!
No takers so far - anybody?
Alex Hillman
-----Original Message-----
Sent: Thursday, September 06, 2001 4:30 PM
To: Multiple recipients of list ORACLE-L
Let's assume that SQL statement was parsed by user X. If this or another user reexecute this same statement what are the conditions that this SQL statement will be reparsed? Let's assume that privileges are not changed and tables and/or views are not dropped and views are not changed. And optimizer parameters are not changed. First come to mind is dropping index. What about reanalizing one of the object - theoretically should also reparse. Anything else?
Also is there possibility to force reparsing of SQL statement if let say index was added - short of flashing shared pool?
Alex Hillman
--
Please see the official ORACLE-L FAQ: http://www.orafaq.com
--
Author: Hillman, Alex
INET: Alex.Hillman_at_usmint.treas.gov
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists --------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists --------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists --------------------------------------------------------------------To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Fri Sep 14 2001 - 08:04:46 CDT
 |
 |