9.2.0.5, AIX 5.2 I'm able to execute the command with no errors, and get the "System altered" confirmation message, but then when I try to create a trace file (e.g. set sql_trace=true), no file gets created - not in the original udump directory or the new one. When I alter the parameter back to its original value, then I am able to create trace files in the original udump directory once again. Anyone else seen this and know of a solution (other than changing it in the pfile/spfile and bouncing the database)? Oh yeah, I also made sure to disconnect and then start a new session after changing the value. I found a bug (#4090774) on Metalink but it was for VMS only, and they said that the change worked after starting a new session, so this doesn't seem to apply. Thanks, Brandon Privileged/Confidential Information may be contained in this message or attachments hereto. Please advise immediately if you or your employer do not consent to Internet email for messages of this kind. Opinions, conclusions and other information in this message that do not relate to the official business of this company shall be understood as neither given nor endorsed by it.