查看oracle的alert日志，根据日志进一步判断问题

[oracle@node1 ~]$ oerr ora 3113
03113, 00000, “end-of-file on communication channel”
// *Cause: The connection between Client and Server process was broken.
// Action: There was a communication error that requires further investigation.
// First, check for network problems and review the SQLNet setup.
// Also, look in the alert.log file for any errors. Finally, test to
// see whether the server process is dead and whether a trace file
// was generated at failure time.
[oracle@node1 ~]$