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ORA-messages
ORA-00056
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-00056: DDL lock on object "string.string" is already held in an incompatible mode
Cause: An attempt was made to acquire a DDL lock that is already locked.
Action: This happens if you attempt to drop a table that has parse locks on it.
