Final answer:
To check if a table is locked in Oracle, you can query views such as V$LOCK and DBA_BLOCKERS. Specifically querying V$LOCKED_OBJECT and V$LOCK with the table name can show any existing locks and session details. Appropriate permissions are required to access these views.
Step-by-step explanation:
How to Check if a Table is Locked in Oracle
To detect if a table is locked in Oracle, you can query the database's data dictionary views such as V$LOCK, DBA_BLOCKERS, and DBA_WAITERS. These views provide information about the current locks on the database objects. Specifically, V$LOCKED_OBJECT and V$LOCK can be queried to see if there are any locks on a table. We can use the following SQL query:
SELECT
o.object_name,
l.session_id,
v.sid,
v.serial#,
v.username,
v.osuser
FROM
v$locked_object l,
dba_objects o,
v$session v
WHERE
l.object_id = o.object_id
AND v.sid = l.session_id
AND o.object_name = 'YOUR_TABLE_NAME';
Replace 'YOUR_TABLE_NAME' with the actual name of the table you're interested in. If this query returns rows, it means that the table is currently locked. The results will provide details about the session that has locked the table, including session ID and user details.
Note that you need the appropriate permissions to access these views, as they contain sensitive information about the database's internal state.