Here are the notes/bugs I was referring to: Subject: ORA-600  and ORA-600 [KOKEIIX1] Reported While Upgrading Or Patching Databases To 10.2.0.3 Doc ID <https://metalink.oracle.com/help/usaeng/Search/search.html#file> : Note:412271.1 Bugs: 5755471 & 5748280 & 4350677 - which all appear to be related according to the above note. ________________________________ From: Allen, Brandon Sent: Tuesday, March 06, 2007 11:04 AM To: 'zhuchao@xxxxxxxxx'; exriscer@xxxxxxxxx; oracledba.williams@xxxxxxxxx; Oracle Discussion List Subject: RE: 10g upgrade survey--performance/stability There are some bugs posted on Metalink that specifically affect data upgraded to 10.2.0.3. I don't recall them off the top of my head, but they have been posted on this list in the last few weeks so you might want to search the archives and/or Metalink and/or open an SR to check them. ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Zhu,Chao So with all the long discussion about how to upgrade (actually decided by your business requirement: downtime, dbsize mostly), anyone have something to summarize when it comes to performance area/stable in 10g after migrate to 10.2.0.3(our target version)? 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.