Session1创建测试表：
SQL> create table test (id number (10) not null , name varchar(20), primary key(id));
Table created.
SQL> desc test;
Name Null? Type
----------------------------------------- -------- ----------------------------
ID NOT NULL NUMBER(10)
NAME VARCHAR2(20)
SQL> insert into test values(001,'tom');
1 row created.
SQL> insert into test values(002,'lisa');
1 row created.
SQL> insert into test values(003,'joy');
1 row created.
SQL> insert into test values(004,'jia');
1 row created.
查看test表信息
SQL> update test set name='xue' where name='joy';
1 row updated.
SQL> commit;
Commit complete.
SQL> select * from test updata;
ID NAME
---------- --------------------
1 tom
2 lisa
3 xue
4 jia
重新打开session 2：
SQL> select * from test；
ID NAME
---------- --------------------
1 tom
2 lisa
3 xue
4 jia
update模拟锁表
SQL> update test set name='da' where name='tom';
1 row updated.
注：不提交
Session2查询：
SQL> select * from test；
ID NAME
---------- --------------------
1 tom
2 lisa
3 xue
4 jia
查看哪个表被锁
SQL> select b.owner,b.object_name,a.session_id,a.locked_mode from v$locked_object a,dba_objects b where b.object_id = a.object_id;
OWNER
------------------------------
OBJECT_NAME
--------------------------------------------------------------------------------
SESSION_ID LOCKED_MODE
---------- -----------
SYS
TEST
23 3
查看是哪个session引起的
SQL> select b.username,b.sid,b.serial#,logon_time from v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time;
USERNAME SID SERIAL# LOGON_TIM
------------------------------ ---------- ---------- ---------
SYS 23 23 02-JAN-20
杀掉对应进程
SQL> alter system kill session'23,23';
System altered.
其中23为sid,23为serial#.
SQL> select b.owner,b.object_name,a.session_id,a.locked_mode from v$locked_object a,dba_objects b where b.object_id = a.object_id;
no rows selected
SQL> select b.username,b.sid,b.serial#,logon_time from v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time;
no rows selected
session 1查询：
SQL> select * from test;
select * from test
*
ERROR at line 1:
ORA-00028: your session has been killed
SQL> select * from test;
select * from test
*
ERROR at line 1:
ORA-01012: not logged on
Process ID: 5366
Session ID: 23 Serial number: 23
重新连接SQL
[oracle@localhost ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.4.0 Production on Thu Jan 2 11:39:53 2020
Copyright (c) 1982, 2013, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> select * from test updata;
ID NAME
---------- --------------------
1 tom
2 lisa
3 xue
4 jia