Find Blocking Session details

How to find Oracle Database Blocking Session Details

In first step, find SID from v$session.

SQL> select process,sid, blocking_session from v$session where blocking_session 

 is not null;
 PROCESS SID BLOCKING_SESSION
 ———— ———- —————-
 1234 365 366
 1234 366 365

In second step find the serial number for the Blocking Session to kill using SID

 SQL> select SERIAL# from v$session where SID=365;
 SERIAL#
 ———-
 130

In third step, kill the blocking session using SID and serial number

SQL> alter system kill session ’365,130′;
 System altered.