Reasons why Oracle locks the table

The reason why oracle locks the table:

1. Check the lock table situation in the current system in ORACLE

select * from v$locked_object

You can pass Query

v$locked_object to get sid and objectid,

and then use sid and v$session chainTable query is where the table is locked,

uses the objectid field in v$session and the of dba_objects id field association,

query detailed lock table status.

Query the SQL as follows:

select sess.sid, 
       sess.serial#, 
       lo.oracle_username, 
       lo.os_user_name, 
       ao.object_name, 
       lo.locked_mode 
from v$locked_object lo, dba_objects ao, v$session sess, v$process p 
where ao.object_id = lo.object_id and lo.session_id = sess.sid;

Query what SQL caused the lock table, the SQL is as follows:

select l.session_id sid, 
       s.serial#, 
       l.locked_mode, 
       l.oracle_username, 
       s.user#, 
       l.os_user_name, 
       s.machine, 
       s.terminal, 
       a.sql_text, 
       a.action 
  from v$sqlarea a, v$session s, v$locked_object l 
where l.session_id = s.sid and s.prev_sql_addr = a.address 
order by sid, s.serial#;

2. ORACLE unlocking method

alter system kill session 'sid,serial#';

spid Locked process number

serial# v$session 这个视图中取出来的

Recommended tutorial: "Oracle Tutorial"

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