Apex 4.0 install note - watch out for PLSQL_OPTIMIZE_LEVEL 3 in 11g!

Hi all,
I just wanted to share a tidbit I found during installation Apex 4.0 on an 11.2.0.1.1 database on a slower computer...
We had our PLSQL_OPTIMIZE_LEVEL set to 3 to enable code-inlining for PL/SQL objects - and this REALLY slowed down the apex installation big time. It was so slow I aborted the install, then restarted after setting it down to level 2.
After setting it to level 2 - it really sped up and installed fine.
I just wanted to share this in case others run into a hanging install like I did...
I'm thinking that apexins.sql should be modified to "ALTER SESSION SET plsql_optimize_level = 2;" before proceeding - but before then - be sure to keep an eye out for this...
Good luck!
Edited by: Philbewan on Jun 24, 2010 6:14 PM

Hi Phil,
Thanks for posting this information.
I've installed APEX 4.0 with optimization level 3 and code=type = native in an 11.2.0.1 database, and you're correct - it took a while. And I imagine on a "slower computer", this will take even longer. But I reason this is to be expected - you're asking the PL/SQL optimizing compiler to be most aggressive in its optimization against the PL/SQL objects of Application Express...and as you know, there is a lot of PL/SQL in Application Express.
Also, the installation and compilation step is a one-time event. If you're looking for maximum performance for each and every page view (execution of the APEX engine for millions of page views), the extra cost of time associated with installation seems almost trivial, by comparison.
I don't agree that apexins.sql should be modified to alter the PL/SQL optimization level. Customers have it set for a particular reason and the Application Express installer shouldn't override that.
Regardless, I do believe your advice to be aware of this setting is worthwhile for the APEX community. Thanks for sharing this.
Joel

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