Thanks for the replies.
I will also admit (sheepishly) that until today, I didn't realize that
the "Misses in library cache during parse:" line after each statement
in a trace file tells you how many of the parses for a statement were
hard parses.
- Cary Millsap <cary.millsap_at_hotsos.com> wrote:
> 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
>
> Upcoming events:
> - Hotsos Clinic 101 in Sydney
> - Hotsos Symposium 2004, March 7-10 Dallas
> - Visit www.hotsos.com for schedule details...
>
>
> -----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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> --
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>
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>
Paul Baumgartel
Transcentive, Inc.
www.transcentive.com
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Received on Thu Aug 21 2003 - 12:19:27 CDT
