RE: Multiple parses with bind variables

From: Cary Millsap <cary.millsap_at_hotsos.com>
Date: Wed, 20 Aug 2003 18:54:24 -0800
Message-ID: <F001.005CBD6B.20030820185424@fatcity.com>

Exactly! This is the thing that ora_check_sql=>0 prevents when you use the Perl DBI. Then there's the problem of doing the prepare() inside a loop. The way to fix that problem is to NEVER PARSE INSIDE A LOOP.

Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com

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-----Original Message-----
Josh Collier
Sent: Wednesday, August 20, 2003 3:45 PM To: Multiple recipients of list ORACLE-L

The application that is running this, or the connection thinger (ODBC, JDBC,
DBI) is parsing it twice. They often do a describe before a parse, which results in two parses for every execution.

 945 * 2 = 1895

Josh

-----Original Message-----
Sent: Wednesday, August 20, 2003 1:34 PM To: Multiple recipients of list ORACLE-L

Why should a query such as this, with bind variables and no literals, be parsed so many times? Other queries in the trace show, for example, 2 parses and 160000 executions. And while I'm at it, why does is the parse count shown equal to the SUM of executes and fetches?

SELECT BENEFICIARY_FK, BENEFICIARY_PHONE_PK, PHONE_TYPE_FK, PHONE_NUMBER
FROM BENEFICIARY_PHONE WHERE COMPANY_FK = :V00001 AND BENEFICIARY_FK IN ( :V00002)    call count cpu elapsed disk query current     

• ------ -------- ---------- ---------- ---------- ---------- Parse 1890 0.21 0.17 0 0 0

Execute    945      0.04       0.08          0          0          0   
       
Fetch      945     38.48      43.24          0     620428          0

---

Paul Baumgartel
Transcentive, Inc.
www.transcentive.com

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Author: Josh Collier
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Author: Cary Millsap
  INET: cary.millsap_at_hotsos.com

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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 Wed Aug 20 2003 - 21:54:24 CDT