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ORA-messages
ORA-00024
Common error messages
TNS connection closed
IO error writing block
Resource busy
Invalid character
Invalid datatype
Syntax error
Looping chain synonyms
Resolve connect identifier
number too large for buffer
ORA-01487
ORA-04031
ORA-12545
ORA-06550
ORA-01650
All error messages
OraDev.com
ORA-00024: logins from more than one process not allowed in single-process mode
Cause: Trying to login more than once from different processes for ORACLE started in single-process mode.
Action: Logoff from the other process.
