RE: 10046 trace - weird library misses

Tim,

Thanks for you idea, doesn't solve the mistery though.

AFAK, eliminating _HARD_ parses doesn't seem to be client-side responsibility, server takes care of this. This is definitely true about soft parses, i.e., client side cursor caching. BTW JDBC 9.x driver is capable of maintaining statement cache, which allows to avoid even soft parses.
And last detail, there is no unnecessery HARD parse (and hence library misses) when I execute SQL rather than PL/SQL from SQL plus or tracing is disabled.

Regards
Vadim

-----Original Message-----
Sent: Thursday, February 13, 2003 11:14 AM To: Multiple recipients of list ORACLE-L

Not an RDBMS bug -- it is the behavior of both your JDBC thin program as well as SQL*Plus. Every execute is preceded by a parse in SQL*Plus -- they didn't write that utility with parsing efficiency as a primary goal.

Apparently, neither was the JDBC thin code...

• Original Message ----- To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com> Sent: Thursday, February 13, 2003 7:49 AM

> Dear friends,
>
> I traced one of our test cases and found something weird.
>
> Did anybody else observe this?
>
> Env:
> server - 9.0.1.4, Solaris.
> client - weblogic 7, uses original oracle thin 9.0.1 jdbc driver to
connect.
> In fact, I can reproduce all this from SQLPlus
>
> Here is an excerpt from tkprof below - why every parse is a hard parse?
> Looks like the problem doesn't appear when 10046 is not set, and it appers
> ONLY on pl/sql blocks returning data to client, normal selects OK. Looks
> like bug again. Any workaround?
>
> And what are these "Misses in library cache during execute"?
>
> 9.2.0.2 on Linux works fine, i.e. no misses once it has been parsed.
>
> BEGIN :1 := FN_GET_STATUS_ID(:2,:3); END;
>
>
> call count cpu elapsed disk query current
> rows
> ------- ------ -------- ---------- ---------- ---------- ----------
> ----------
> Parse 40 0.07 0.08 0 0 0
> 0
> Execute 80 0.62 1.55 64 1492 0
> 80
> Fetch 0 0.00 0.00 0 0 0
> 0
> ------- ------ -------- ---------- ---------- ---------- ----------
> ----------
> total 120 0.69 1.63 64 1492 0
> 80
>
> Misses in library cache during parse: 40
> Misses in library cache during execute: 40
> Optimizer goal: CHOOSE
> Parsing user id: 40
>
> This select
>
> select LOADED_VERSIONS, EXECUTIONS, LOADS,PARSE_CALLS, parsing_user_id
> from v$sql
> where sql_text like 'BEGIN :1 := FN_GET_STATUS_ID(:2,:3); END;';
>
> gives out whole bunch of these record groups
>
> LOADED_VERSIONS EXECUTIONS LOADS PARSE_CALLS PARSING_USER_ID
> --------------- ---------- ---------- ----------- ---------------
> 1 1 1 1 40
> 1 1 1 0 40
> .... repeated N times
>
> Thank you for you time
>
> Vadim G
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Gorbounov,Vadim
> INET: vadim.gorbounov_at_liberate.com
>
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-- 
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-- 
Author: Tim Gorman
  INET: Tim_at_SageLogix.com

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-- 
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-- 
Author: Gorbounov,Vadim
  INET: vadim.gorbounov_at_liberate.com

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