Oracle® Database 11g / 12c / 18c error codes ORA-01502: index ''[string].[string]'' or partition of such index is in unusable state

ORA-01502: index ''[string].[string]'' or partition of such index is in unusable state

Oracle Error Code: ORA-01502

Cause: An attempt has been made to access an index or index partition that has been marked unusable by a direct load or by a DDL operation

Action: DROP the specified index, or REBUILD the specified index, or REBUILD the unusable index partition