Identifying Locked Rows in Oracle Using v$session

Thu, 05 Sep 2024 00:00:00 +0000

Identifying Locked Rows in Oracle Database using tables v$session and dba_objects

Purpose

This Oracle query pinpoints the exact row a specific session is waiting on due to a lock. It first finds the locked object and row location, then constructs a ROWID to fetch and display the entire locked row from the table.

Sample SQL Command

 1/* Show which row is locked
 2
 3select do.object_name
 4, row_wait_obj#
 5, row_wait_file#
 6, row_wait_block#
 7, row_wait_row#
 8, dbms_rowid.rowid_create (1, ROW_WAIT_OBJ#, ROW_WAIT_FILE#,
 9 ROW_WAIT_BLOCK#, ROW_WAIT_ROW#)
10from v$session s
11, dba_objects do
12where sid=&sid
13and s.ROW_WAIT_OBJ# = do.OBJECT_ID
14/
15
16/* Then select the row with that rowid...
17
18select * from <table> where rowid=<rowid>;

Code Breakdown

Query 1:

Dbms_rowid on Oracle Scripts

Identifying Locked Rows in Oracle Using v$session

Identifying Locked Rows in Oracle Database using tables v$session and dba_objects

Purpose

Sample SQL Command

Code Breakdown