Error shows after logging in:

[IBM][CLI Driver][DB2/AIX64] SQL0220N The Explain table "xxx.ADVISE_INDEX", column "NLEAF" does not have the proper definition or is missing. SQLSTATE=55002
1. Backup existing table "ADVISE_INDEX" (DDL and its data if any) for precautionary measure.
2. Drop the table:
Drop TABLE ADVISE_INDEX;
3. Connect to SQL Optimizer and you will be prompted to recreate the table.