Siebel Performance Tuning Guide > Tuning Siebel EIM for Performance > Troubleshooting EIM Performance >
Using the USE INDEX HINTS and USE ESSENTIAL INDEX HINTS Parameters
Perform testing with the .IFB file parameters USE INDEX HINTS and USE ESSENTIAL INDEX HINTS, trying both settings (TRUE and FALSE). The default value for USE INDEX HINTS is FALSE. The default value for USE ESSENTIAL INDEX HINTS is TRUE.
NOTE: If your configuration file has more than one process section, you must specify USE INDEX HINTS within each one.
If these parameters are set to FALSE, EIM does not generate hints during processing. By setting the value to FALSE, you may realize performance gains if the TRUE setting means that hints are being generated that direct the database optimizer to use less than optimal indexes. EIM processing should be tested with both the TRUE and FALSE settings to determine which one provides better performance for each of the respective EIM jobs.
NOTE: The USE INDEX HINTS parameter is only applicable for Oracle database platforms. The USE ESSENTIAL INDEX HINTS parameter is only applicable for Microsoft SQL Server and Oracle database platforms.
These two parameters work for different queries, so you need to enable both to get all of the index hints on Oracle database platforms.
Further information is provided as follows: