Oracle locking related checkings: Part I

1. Who is placing a lock on a table and what is the person doing:

define thesid=”
select o.object_name, session_id thesid, oracle_username, locked_mode
from v$locked_object lo, dba_objects o
where o.object_id=lo.object_id and o.object_name=‘table_name’;
select a.sid, a.serial#, b.sql_text from v$session a, v$sqlarea b where a.sql_address=b.address
  and a.sid=’&&thesid’;

2. List the blocking sessions

select blocking_session, sid, serial#, wait_class, seconds_in_wait
from v$session
where blocking_session is not NULL
order by blocking_session;
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