Have any one indexed system catalog table. I have some poor performing sql that is spending lot of time on tablescan on system catalog table. I wanted to index that perticular column and DB2 does not allow me to set up an index on system catalog table.
My version of db2 is 8.1.6

Any suggestions how i can accomplish this task to improove the performance.

RUNSTATS on the system catalog table is the one you are likely to need.

Also, consider tuning catalog cache size db cfg and if needed, a separate bufferpool for the catalog tablespace.

If you think this is causing a huge problem, get IBM support to look into this.