Commands to solve lock table in oracle

Oracle lock table problems can be solved with the following commands: View locked tables: SELECT * FROM V$LOCKED_OBJECTS; Release table locks: ALTER SYSTEM KILL SESSION '[session_id]'; Unlock or wait: COMMIT; Or ROLLBACK; force unlock (use with caution): ALTER TABLE [table_name] ENABLE ROW MOVEMENT; modify session parameters: _optimizer_locks and _transaction_timeout; detect lock type: SELECT *

Command to solve Oracle lock table problem

When there is a lock table problem in Oracle, you can use the following command to solve it:

1. View the locked Table

<code class="sql">SELECT * FROM V$LOCKED_OBJECTS;</code>

2. Release the table lock

<code class="sql">ALTER SYSTEM KILL SESSION '[session_id]';</code>

where: [session_id] is the session ID that caused the lock.

3. Unlock or wait

<code class="sql">COMMIT;
ROLLBACK;</code>

4. Force unlock (use with caution)

<code class="sql">ALTER TABLE [table_name] ENABLE ROW MOVEMENT;</code>

5 . Modify session parameters

If the problem is caused by improper setting of session parameters, you can modify the following parameters:

• _optimizer_locks: Disable the query optimizer Lock.
• _transaction_timeout: Increase the transaction timeout.

6. Detect the type of lock

Use the following command to detect the type of lock:

<code class="sql">SELECT * FROM V$LOCKS WHERE TABLE_NAME = '[table_name]';</code>

7. According to the type of lock Type Unlock

• Row-level lock (TX): Released using COMMIT or ROLLBACK.
• Table-level lock (TM): Use ALTER SYSTEM KILL SESSION '[session_id]' to release.
• DML lock (DML): Released using COMMIT or ROLLBACK.
• DDL lock (DDL): Wait for the DDL statement to complete or use ALTER SYSTEM KILL SESSION '[session_id]' to force release.

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