I have tried many iterations to upgrade my RAC environment 10.2.0.4 to 10.2.0.4.3, it seems that the upgrade is not possible with a downtime. Now oracle also has bugs in there documents :) Patch 9119284 - 10.2.0.4.3 Patch Set Update This step 3 in the above document is not possible without bringing all the nodes down. Does anybody knows any work-around for this. Readme of Patch 9119284 " If the database is in a RAC environment, run the view recompilation script as follows. Note that this script is run with the database in upgrade mode, which restricts connections as SYSDBA. Stop all instances except the one where the view recompilation is being executed. 3 cd $ORACLE_HOME/cpu/view_recompile sqlplus /nolog SQL> CONNECT / AS SYSDBA SQL> STARTUP NOMOUNT SQL> ALTER SYSTEM SET CLUSTER_DATABASE=FALSE SCOPE=spfile; SQL> SHUTDOWN SQL> STARTUP UPGRADE SQL> @view_recompile_jan2008cpu.sql SQL> SHUTDOWN; SQL> STARTUP NOMOUNT; Set the CLUSTER_DATABASE initialization parameter to TRUE: SQL> ALTER SYSTEM SET CLUSTER_DATABASE=TRUE SCOPE=spfile; Restart the database: SQL> QUIT cd $CRS_HOME/bin srvctl start database -d <database-name> " Thanks & regards, Pankaj Jain 10 Second Avenue, Burlington, MA 01803 Work (781) 505-7925 Cell (978) 987-0004 Fax (781) 505-7382, Email: pjain@xxxxxxxxxx <blocked::mailto:pjain@xxxxxxxxxx> ; 9789870004@xxxxxxxxx <mailto:9789870004@xxxxxxxxx> Simplicity is approaching life's complications with a clear and balanced mind, that is free from desires.