Hi John, According to Metalink doc 603911.993 it's related to a failure finding the current online redo log file during thread recovery. This is a forum thread and there's not much info there though. mvg/regards Jo "John Dunn" <JDunn@xxxxxxxxx> Sent by: To oracle-l-bounce@f <oracle-l@xxxxxxxxxxxxx> reelists.org cc Subject 04-05-07 09:51 Urgent ORA-00600: internal error code Please respond to JDunn@xxxxxxxxx Following the replacement of a disk I did a mksysb restore on a AIX 5.2 machine running Oracle 9.2 All the Oracle software, data files etc were on a tar tape that has also been restored. But now when I try to startup Oracle I get the message ORA-00600: internal error code, arguments: [3004], [1], [0], [0], [], [], [], [] Does anyone have any advice or information on this error? AMI Semiconductor - "Silicon Solutions for the Real World" NOTICE: This electronic message contains information that may be confidential or privileged. The information is intended for the use of the individual or entity named above. If you are not the intended recipient, please be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. If you received this electronic message in error, please notify the sender and delete the copy you received. -- //www.freelists.org/webpage/oracle-l