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Locks can be acquired at both the table and sub-partition level with partitioned tables in Oracle. A transaction acquires a table lock when a table is modified in the following DML statements: INSERT, UPDATE, DELETE, SELECT with the FOR UPDATE clause, and LOCK TABLE.

A session releases all the tables locks with it at once. You can implicitly release the table locks. If the connection to the server terminates explicitly or implicitly all the locks will be released. You can release the locks of a table explicitly using the UNLOCK TABLES statement.

This occurs when one user is updating or deleting a row, which another session wants to update or delete. This type of TX enqueue wait corresponds to the wait event enq: TX - row lock contention . The solution is to have the first session holding the lock perform a COMMIT or ROLLBACK .

Answer: The only way to release a lock on an Oracle table is to kill the session that is holding the lock, or wait for the transaction to complete. See my related notes on finding Oracle locked_objects and killing_Oracle sessions.

A session releases all the tables locks with it at once. You can implicitly release the table locks. If the connection to the server terminates explicitly or implicitly all the locks will be released. You can release the locks of a table explicitly using the UNLOCK TABLES statement.

Use the LOCK TABLE statement to lock one or more tables, table partitions, or table subpartitions in a specified mode. This lock manually overrides automatic locking and permits or denies access to a table or view by other users for the duration of your operation.

In System View, click the Database Properties icon. In Enterprise View, expand the Oracle Hyperion Planning application type and the application that contains the database for which you want to remove a lock. Right-click the database, and then select Remove Lock(s).

InnoDB releases its internal table lock at the next commit, but for MySQL to release its table lock, you have to call UNLOCK TABLES . You should not have autocommit = 1 , because then InnoDB releases its internal table lock immediately after the call of LOCK TABLES , and deadlocks can very easily happen.

Locks can be acquired at both the table and sub-partition level with partitioned tables in Oracle. A transaction acquires a table lock when a table is modified in the following DML statements: INSERT, UPDATE, DELETE, SELECT with the FOR UPDATE clause, and LOCK TABLE.

A session releases all the tables locks with it at once. You can implicitly release the table locks. If the connection to the server terminates explicitly or implicitly all the locks will be released. You can release the locks of a table explicitly using the UNLOCK TABLES statement.

This occurs when one user is updating or deleting a row, which another session wants to update or delete. This type of TX enqueue wait corresponds to the wait event enq: TX - row lock contention . The solution is to have the first session holding the lock perform a COMMIT or ROLLBACK .

Answer: The only way to release a lock on an Oracle table is to kill the session that is holding the lock, or wait for the transaction to complete. See my related notes on finding Oracle locked_objects and killing_Oracle sessions.

A session releases all the tables locks with it at once. You can implicitly release the table locks. If the connection to the server terminates explicitly or implicitly all the locks will be released. You can release the locks of a table explicitly using the UNLOCK TABLES statement.

Use the LOCK TABLE statement to lock one or more tables, table partitions, or table subpartitions in a specified mode. This lock manually overrides automatic locking and permits or denies access to a table or view by other users for the duration of your operation.

In System View, click the Database Properties icon. In Enterprise View, expand the Oracle Hyperion Planning application type and the application that contains the database for which you want to remove a lock. Right-click the database, and then select Remove Lock(s).

InnoDB releases its internal table lock at the next commit, but for MySQL to release its table lock, you have to call UNLOCK TABLES . You should not have autocommit = 1 , because then InnoDB releases its internal table lock immediately after the call of LOCK TABLES , and deadlocks can very easily happen.