You are able to lock a table to prevent executing Data Manupulation Language-DML commands like INSERT, UPDATE, DELETE by others users:
e.g.
SQL> SELECT * FROM employees FOR UPDATE;
-- in this way, other users could not execute DML command that hangs up until user sends COMMIT or ROLLBACK to release the table lock. However, other users are able to execute SELECT still.
e.g.
SQL> SELECT * FROM employees FOR UPDATE;
-- in this way, other users could not execute DML command that hangs up until user sends COMMIT or ROLLBACK to release the table lock. However, other users are able to execute SELECT still.
