Fairlie, Take a look at patch P5118272. It has to do with memory allocated within the SGA for IPC messages between the Oracle processes. It can cause LWGR to crash the instance with an ORA-00600[1433] if you loose contact with the DR site or the DR site gets behind badly enough. BTW: this patch in included in the 10.2.0.4 patchset which has been released. ______________________________________________________________ Dick Goulet / Capgemini North America P&C / East Business Unit Senior Oracle DBA / Hosting Office: 508.573.1978 / Mobile: 508.742.5795 / www.capgemini.com Fax: 508.229.2019 / Email: richard.goulet@xxxxxxxxxxxxx 45 Bartlett St. / Marlborough, MA 01752 Together: the Collaborative Business Experience ______________________________________________________________ ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of fairlie rego Sent: Tuesday, May 06, 2008 6:32 PM To: Oracle-L Subject: Patches for Dataguard on top of 10.2.0.3 Hi all, Conifguration Dataguard with Physical Standby and real time apply in Max performance mode between two 8 node RAC clusters Platform Sun Sparc Solaris 64 bit Oracle 10.2.0.3 + 25 one off patches (the application uses most Oracle features ) Transaction rate: 600 tps I am setting up Dataguard and would like to know if there are any "must have" patches in regards to MRP, switchover etc for the above config. I am aware of DG bundle patches and bundle patchset 1 which was released in August 2007. If any of you have come across a latter bundle and have had to apply it please let me know Thanks much Fairlie Fairlie Rego Senior Oracle Consultant http://el-caro.blogspot.com/ M: +61 402 792 405 ________________________________ Get the name you always wanted with the new y7mail email address <http://au.rd.yahoo.com/mail/taglines/au/y7mail/yahoo.com.au/*http:/au.y ahoo.com/y7mail/?p1=ni&p2=general&p3=tagline&p4=yahoo> .