Can you try with RULE hint? Do you have lot of other objects in system tablespace? Ram Raman <veeeraman@xxxxxxxxx> wrote: Hi, I am trying to query dba_waiters and dba_blockers table logged in as sysdba and the queries hang. Oracle v9206. I issued "select * from dba_waiters" and wait for 5, 6 minutes and then killed the query. Just for testing it, once I waited 30 minutes after issuing the query. There was no response, so I killed it. Has anyone observed this behavior before. Thanks. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com