Error Message :
ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired
DB Unload fails to complete and returns errors similar to those below - table names in [brackets] may differ:
20170714/213810.400 - U0003592 UCUDB - Status: '' Native error: '54' Msg: 'ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired'
20170714/213810.400 - U0000005 LOCK
20170714/213810.400 - U0037178 Error occured in SQL-Turncate of table [DIVDB].
20170714/213810.400 - U0037107 Error during reorganization of table ['RH']. Program exits with error.
20170714/213810.448 - U0037022 ABORTING due to error.
This is a common message that is returned by Oracle in one of the following scenarios:
1) A table is already locked by some query. Example: a "select for update" has been executed and has not yet "committed/rollback" and then a "select query" is sent to the same table.
2) A Database user or another application is running a query that caused a lock on a table.