ORA-00603: ORACLE server session terminated by fatal error

If you get following error in SQL Developer:

ORA-00603: ORACLE server session terminated by fatal error
ORA-00600: internal error code, arguments: [kqlidchg1], [], [], [], [], [], [], [], [], [], [], []
ORA-00604: error occurred at recursive SQL level 1
ORA-00001: unique constraint (SYS.I_PLSCOPE_SIG_IDENTIFIER$) violated
00603. 00000 - "ORACLE server session terminated by fatal error"
*Cause: An Oracle server session was in an unrecoverable state.
*Action: Log in to Oracle again so a new server session will be created
automatically. Examine the session trace file for more
information.

You will have to either execute following:

ALTER SESSION SET PLSCOPE_SETTINGS = 'IDENTIFIERS:NONE';

Or in Oracle SQL Developer:

  1. Go to Tools | Preferences
  2. Select Database | PL/SQL Compiler
  3. Change the PLScope identifiers from All to None
  4. Click on Ok
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