RDBMS Version: 10.1.0.4.2 Operating System and Version: RHEL 4.0 2.6.9-11.ELhugemem Database is throwing the tracefile below whenever it tries to update wrh. Searched through the bugs and forums. Found similar issues, but not this particular one. Would appreciate any insight. Node name: rhlv004.formfactor.com Release: 2.6.9-11.ELhugemem Version: #1 SMP Fri May 20 18:34:54 EDT 2005 Machine: i686 Instance name: prod21 Redo thread mounted by this instance: 1 Oracle process number: 45 Unix process pid: 7829, image: oracle@xxxxxxxxxxxxxxxxxxxxxx (m001) *** ACTION NAME:(Remote-Flush Slave Action) 2005-11-17 08:00:29.007 *** MODULE NAME:(MMON_SLAVE) 2005-11-17 08:00:29.007 *** SERVICE NAME:(SYS$BACKGROUND) 2005-11-17 08:00:29.007 *** SESSION ID:(185.52539) 2005-11-17 08:00:29.006 *** KEWROCISTMTEXEC - encountered error: (ORA-00904: "BLOCKING_SESSION_SERIAL#": invalid identifier ) *** SQLSTR: total-len=1411, dump-len=240, STR={INSERT /*+ APPEND */ INTO WRH$_ACTIVE_SESSION_HISTORY ( snap_id, dbid, instance_number, sample_id, sample_time, session_id, session_serial#, user_id, sql_id, sql_child_number, sql_plan_hash_value, service_hash, session_type, sql} kewa_flusher: Exception handler 13509 - Will resignal! *** KEWRAFM1: Error=13509 encountered by kewrfteh