We are running oracle 10.2.0.1 on Solaris 5.10 SQL> select * from v$version; BANNER ---------------------------------------------------------------- Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi PL/SQL Release 10.2.0.1.0 - Production CORE 10.2.0.1.0 Production TNS for Solaris: Version 10.2.0.1.0 - Production NLSRTL Version 10.2.0.1.0 - Production But in udump directory, I see lots of small trace files, and typically it has something like *** 2007-09-19 08:59:23.924 *** ACTION NAME:() 2007-09-19 08:59:23.917 *** MODULE NAME:(SQL*Plus) 2007-09-19 08:59:23.917 *** SERVICE NAME:(DS10ORA2) 2007-09-19 08:59:23.917 *** SESSION ID:(1000.8924) 2007-09-19 08:59:23.917 Resized overflow buffer to 10240K (for 9352K LWN) Resized overflow buffer to 9216K (for 8235K LWN) Resized overflow buffer to 9216K (for 8310K LWN) *** 2007-09-19 09:02:28.434 Resized overflow buffer to 10240K (for 9352K LWN) Resized overflow buffer to 9216K (for 8235K LWN) Resized overflow buffer to 9216K (for 8310K LWN) Does anyone know why I am getting these? I am curious what the root cause is. Thanks. Guang