as a first check, have you set correctly your shell environment variables? oracle@xxx@yyy: ~ -bash-3.00 $ export ORACLE_SID=test <== sid does not exist oracle@xxx@yyy: ~ -bash-3.00 $ sqlplus goran/goran SQL*Plus: Release 10.2.0.2.0 - Production on Wed Aug 22 16:19:15 2007 Copyright (c) 1982, 2005, Oracle. All Rights Reserved. ERROR: ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist DIANNA GIBBS wrote: We've been having AIX, disk and cluster issues all week. I'm today trying to run an RDA in both of our RAC environments. kronp2 is our primary oracle instance on kronprod2 and I can run the RDA from that node with no issues. When I try to run it from our secondary node, kronprod1 (instance kronp1), I get this error. Processing Initialization module ... ORA-01034: ORACLE not available The database to be analyzed (kronp2) does not appear to be accessible. The application is having periodic issues connecting as well. I can connect to both from my oracle client fine. I've looked at all the log files I can find and see nothing - any ideas? TIA. Dianna G.