Set the OPT_GOAL environment variable
in the user environment, before you start an application, to specify
the query performance goal for the optimizer.
0
Specifies user-response-time optimization.
-1
Specifies total-query-time optimization.
The default behavior is for the optimizer to use
query plans that optimize the total query time.
You can also
specify the optimization goal for individual queries with optimizer
directives or for a session with the SET OPTIMIZATION statement.
Both
methods take precedence over the OPT_GOAL environment
variable setting. You can also set the OPT_GOAL configuration parameter
for the HCL OneDB™ system;
this method has the lowest level of precedence.
For more information
about optimizing queries for your database server, see your HCL OneDB Performance
Guide. For
information about the SET OPTIMIZATION statement, see the HCL OneDB Guide to SQL:
Syntax.