oracle锁表如何处理 oracle 是否锁表

oracle表被锁了怎么处理?

首先你要知道表锁住了是不是正常锁？因为任何DML语句都会对表加锁。\x0d\x0a\x0d\x0a你要先查一下是那个会话那个sql锁住了表，有可能这是正常业务需求，不建议随便KILLsession，如果这个锁表是正常业务你把sessionkill掉了会影响业务的。\x0d\x0a建议先查原因再做决定。\x0d\x0a\x0d\x0a(1)锁表查询的代码有以下的形式：\x0d\x0aselectcount(*)fromv$locked_object;\x0d\x0aselect*fromv$locked_object;\x0d\x0a(2)查看哪个表被锁\x0d\x0aselectb.owner,b.object_name,a.session_id,a.locked_modefromv$locked_objecta,dba_objectsbwhereb.object_id=a.object_id;\x0d\x0a(3)查看是哪个session引起的\x0d\x0aselectb.username,b.sid,b.serial#,logon_timefromv$locked_objecta,v$sessionbwherea.session_id=b.sidorderbyb.logon_time;\x0d\x0a\x0d\x0a(4)查看是哪个sql引起的\x0d\x0aselectb.username,b.sid,b.serial#,c.*fromv$locked_objecta,v$sessionb,v$sqlcwherea.session_id=b.sid\x0d\x0aandb.SQL_ID=c.sql_idandc.sql_id=''\x0d\x0aorderbyb.logon_time;\x0d\x0a\x0d\x0a(5)杀掉对应进程\x0d\x0a执行命令：altersystemkillsession'1025,41';\x0d\x0a其中1025为sid,41为serial#.

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模拟oracle数据库update锁表现象及处理办法

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

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

oracle 表锁住了什么原因

在对指定表做append操作，其他再做truncate时候，会产生锁表，如下验证步骤，

1、创建测试表，

create table test_lock(id number, value varchar2(200));

2、执行append语句；并且不做提交，insert /*+append*/ into test_lock values(1,1);

3、再次执行清表语句，truncate table test_lock;报锁表错误，

4、查看锁表语句，发现被锁表，

select b.object_name, t.*

from v$locked_object t, user_objects b

where t.object_id = b.object_id

oracle数据库怎么锁表

oracle数据库分行级锁和表级锁。用select * from table-name for update完成行级锁。用delete或update完成表级锁。你锁定的资源别人会等待你的提交语句或回退语句完成以后再继续进行。

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oracle锁表如何处理 oracle 是否锁表

oracle表被锁了怎么处理?

模拟oracle数据库update锁表现象及处理办法

oracle 表锁住了什么原因

oracle数据库怎么锁表

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