Oracle-L: RE: Oracle slower ?

From: Niall Litchfield <n-litchfield_at_audit-commission.gov.uk>
Date: Tue, 25 Feb 2003 08:09:14 -0800
Message-ID: <F001.00558A67.20030225080914@fatcity.com>

No Oracle isn't slower than alternative RDBMS, at least if it is 9 times slower then it is either misconfigured, or the code is bad, or both. I'd strongly suspect the code to start with. If you treat the output of OMWB as a first cut, or functional prototype then you have a reasonable approach to the migration.

If you can post the code for the slow proc I'm sure folk will be very quick to pick up why it isn't performing.

Niall Litchfield
Oracle DBA
Audit Commission
0117 975 7805

-----Original Message-----
Sent: 25 February 2003 15:09
To: ORACLE-L_at_fatcity.com; rivaldi.bahar_at_bbassi.com

We are converting from SQL Server and Sybase to Oracle. To convert functions and stored procedures we have been using the Oracle Migration Workbench (OMWB) which produced WEAK REF CURSOR and TRANCOUNT global variable.
I looked at (trace and explain plan) statements in the procedures and functions, it seems everything are OK. Init.ora parameters are big enough, statspack generated good values. The same function and procedure took about 1 minute in Sybase but take 9 minutes in Oracle. The difference is the procedures or functions after migration calling OMWB package (globalpkg). Any idea or tuning tips after migrating to Oracle ? Is Oracle slower than Sybase and SQL Server ?

Tia.

Rivaldi

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Author: Bahar, Rivaldi (BBASSI-CHQ)
INET: rivaldi.bahar_at_bbassi.com

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Author: Niall Litchfield
INET: n-litchfield_at_audit-commission.gov.uk

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