Oracle database table locking is a common problem in database management. You may encounter various locking situations during data operations, such as row-level locks, table-level locks, etc. This article will introduce in detail how to handle locked Oracle database tables and provide relevant code examples.
When a session operates on a database table, the corresponding lock will be generated in the database. If another session also attempts to operate on the same row or table, the table may be locked. In this case, the session may be blocked and data operations cannot be performed normally.
You can use the following SQL statement to detect table locking:
SELECT c.owner, c.object_name, c.object_type, b.sid, b.serial#, b.status, b.osuser, b.machine FROM v$locked_object a, v$session b, dba_objects c WHERE b.sid = a.session_id AND a.object_id = c.object_id;
Unlock the locked table
If you determine which session caused the table to be locked, you can unlock the table through the following SQL statement:
ALTER SYSTEM KILL SESSION 'SID,SERIAL#';
Where, SID
and SERIAL
# are the found information of the session that caused the lock.
Assume that table EMPLOYEE
is locked and SID=123, SERIAL#=456
is detected, resulting in locking. You can execute the following SQL statement unlocking:
ALTER SYSTEM KILL SESSION '123,456';
In Oracle database management, it is common to encounter table locks, which need to be handled in time to ensure the smooth progress of data operations. By finding the session information related to the locked table, unlocking the locked table, and eliminating the reasons for locking the table, you can effectively handle the situation where the Oracle database table is locked. I hope the methods provided in this article are helpful to you.
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