Check for locks held after starting the transaction : dba_locks « System Tables Data Dictionary « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial
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Oracle PL/SQL Tutorial » System Tables Data Dictionary » dba_locks 
30. 36. 1. Check for locks held after starting the transaction
SQL>
SQL> CREATE TABLE emp (
  2    id         NUMBER PRIMARY KEY,
  3    fname VARCHAR2(50),
  4    lname  VARCHAR2(50)
  5  );

Table created.

SQL>
SQL> INSERT INTO emp (id, fname, lname)VALUES (1'A''B');

row created.

SQL> INSERT INTO emp (id, fname, lname)VALUES (2'C''D');

row created.

SQL> INSERT INTO emp (id, fname, lname)VALUES (3'E''F');

row created.

SQL> INSERT INTO emp (id, fname, lname)VALUES (4'G''H');

row created.

SQL> INSERT INTO emp (id, fname, lname)VALUES (5'G''Z');

row created.

SQL>
SQL> UPDATE emp
  2  SET fname = 'Ronald'
  3  WHERE id = 44;

rows updated.

SQL>
SQL>
SQL> SELECT d.session_id sid, d.lock_type, d.mode_requested,
  2         d.mode_held, d.blocking_others
  3  FROM dba_locks d, v$session v
  4  WHERE v.username = 'PLSQL'
  5  AND d.session_id = v.sid;

no rows selected

SQL>
SQL>
SQL> drop table emp;

Table dropped.
30. 36. dba_locks
30. 36. 1. Check for locks held after starting the transaction
30. 36. 2. Get the name and type of object locked
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