Re: Changing SQL statements inside the database

I'd believe it.

I have a classic in my seminar where
VPD/FGAC/RLS turned a simple single
table query into a 16-table join.

There is a vague directive from Oracle
nowadays that you should only be using
VPD to generate predicates involving
sys_context() calls, rather than attaching subqueries. This is partly to do with an invalidation issue that Tom Kyte describes in his book.

Jonathan Lewis
http://www.jlcomp.demon.co.uk

Author of:
Practical Oracle 8i: Building Efficient Databases

Next Seminar - Australia - July/August
http://www.jlcomp.demon.co.uk/seminar.html

Host to The Co-Operative Oracle Users' FAQ http://www.jlcomp.demon.co.uk/faq/ind_faq.html

-----Original Message-----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: 02 May 2002 15:32

|But, be *very* careful! You can just imagine how badly you can harm
|performance and accessibility through casual use of this feature...
:-)
|

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Author: Jonathan Lewis
  INET: jonathan_at_jlcomp.demon.co.uk

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