All, I am getting lot of messages as such OciDataSource::executeStatement OCIStmtExecute failed ORA-00028: your session has been killed in the client side .and I tried looking around to see if there is any alter system from database or any cron jobs but could not . when I did a pfiles on the initiator process on the client host I see that there are open socket 58: S_IFSOCK mode:0666 dev:303,0 ino:15888 uid:0 gid:0 size:0 O_RDWR FD_CLOEXEC sockname: AF_INET 172.16.4.135 port: 59939 peername: AF_INET 172.16.4.140 port: 1521 but i do not see any separate unix process/child process for these socket connection. but the db host has a separate process for all these open sockets coming from the client server. Can someone please direct me how to start the trace here or any direction to resolve this . thanks in advance thanks -prasad