RE: Is Cursor Plan an SQL Trace Execution Plan ? ........... Basic Qs
- From: "Alvaro Jose Fernandez" <alvaro.fernandez@xxxxxxxxx>
- To: <VIVEK_SHARMA@xxxxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 6 Sep 2007 23:55:02 +0200
Vivek,
Qs 1 How is the Cursor Plan for the following SQL to be Generated?
by querying v$sql_plan and v$sql_plan_statistics for this hash, you will
obtain one or more plans depending the number of childs of the parent
cursor
Qs 2 Is Cursor Plan same as Execution Plan (obtained from SQL Trace)?
NOTE - The respective NON-RAC Database, (existing on a Solaris Unix
Mounted Filesystem), has already been Bounced.
the plan in the sql trace (not one obtained via running explain = param
of tkprof) will correspond to one or more of the plans generated in
v$sql_plan... if the plan don't have flushed out when you do the query
Statspack excerpt taken during a Benchmark Run of Application
Transactions on this NON-RAC Database:-
CPU CPU per Elapsd
Old
Time (s) Executions Exec (s) %Total Time (s) Buffer Gets
Hash Value
---------- ------------ ---------- ------ ---------- ---------------
----------
364.58 9,170 0.04 15.3 382.19 3,063,141
3246265085
Module: lisrvr-fin-listval@speaixp5lp11 (TNS V1-V3)
SELECT COUNT(*) FROM ICI WHERE ICI.BANK_ID = :1 AND SOL_ID
= :2 AND ZONE_CODE = :3 AND ZONE_DATE = TO_DATE( :4 ,'DD-
MM-YYYY HH24:MI:SS') AND INST_NUM = :5
CASE 2 -
======
A Cold Copy of the above NON-RAC Database was taken into another Mounted
Filesystem partition and Converted using RMAN (Detailed Command given
below) into a 2-Node RAC-ASM Database (existing on RAW Device).
On Repeating the Benchmark Run of the SAME Application Transactions on
this 2-Node RAC ASM Database, using the SAME Application INPUT DATA
Values, the Statspack generated had the SAME "Old Hash Value" i.e.
3246265085 for the SAME SQL Statement (though with Different Comparative
Values of CPU Time (s), Executions, CPU per Exec (s), %Total, Elapsed
Time (s) , Buffer Gets).
Qs 1 Why is the Old Hash Value i.e 3246265085 the SAME for the SAME SQL
Script for BOTH the Databases i.e NON-RAC & 2-Node RAC-ASM?
Nope on this
regards,
alvaro
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