The Oracle optimizer has undergone some major enhancements between Oracle 8.1.7 and 10g, so you may see some changes...
with respect to how some application SQL executes. Some SQL statements in your applications may run faster, and some may run slower. You should take this opportunity to monitor reports, jobs, etc. that use customized SQL and explain them in the 10g database environment. Optimize them in the non-production environment using production data so that you will be prepared when the upgrade to 10g occurs in the production environment.
Statistics collection in the database has also changed significantly between Oracle8i and 10g. This affects the optimizer which may change SQL execution paths. Review the Oracle Database 10g Release 2 New Features Guide for further information.
Dig Deeper on Oracle and SQL
Related Q&A from Maria Anderson
Can I use /var/opt/oracle/oratab to specify listener information? Continue Reading
We would like to migrate our database from Oracle 8.1.7 to Oracle 10g. We would like to know the impact for our application developed using Delphi ... Continue Reading
I'm getting errors while installing the Database Configuration Assistant. Continue Reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.