While inserting data from multi load into teradata table, multi load may fail and your main table may get locked. This lock can be in Acquisition phase or in Application phase.
To release the lock which is in Acquisition phase:-
RELEASE MLOAD TABLE_NAME;
To release the lock which is in Application phase:-
RELEASE MLOAD TABLE_NAME IN APPLY;
To release the lock which is in Acquisition phase:-
RELEASE MLOAD TABLE_NAME;
To release the lock which is in Application phase:-
RELEASE MLOAD TABLE_NAME IN APPLY;