> Whilst trying sqlplus -prelim from 10gR2 vs an 11G database, I found > that you can do it with 11g sqlplus prelim connection, if the listener > is running. Bruce, Yesterday I tried 10g sqlplus -prelim to connect to an 11g database on the same box not using SQL*Net. I couldn't get a real hanganalyze trace. Today I just tried your approach, using 10g sqlplus to 11g through SQL*Net. The trace file still does not show a successful hanganalyze. Mine environment is Client: Windows XP, 10.2.0.1 sqlplus -prelimit sys/...@... as sysdba Server: Linux x86_64, 11.2.0.1, 2-node RAC (but should be irrelevant) I wonder what you did differently than me. Yong Huang -- //www.freelists.org/webpage/oracle-l