oracle查詢資源占用，鎖表解鎖

1. 先通過top命令查看產(chǎn)用資源較多的spid號(hào)

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2.查詢當(dāng)前耗時(shí)的會(huì)話ID，用戶名，sqlID等：

select sid,serial#,machine,username,program,sql_hash_value,sql_id,

? to_char(logon_time,'yyyy/mm/dd hh24:mi:ss') as login_time from v$session

where paddr in (select addr from v$process where spid in ('5648612','256523'));

3. 如果上一步sql_id或者 hash_value不為空，則可用v$sqlarea查出當(dāng)前正在使用的sql

select sql_text

from v$sqltext_with_newlines

where hash_value = hash_value

order by piece;

也可直接使用:

select a.*,b.SQL_TEXT from (

select sid,serial#,machine,username,program,sql_hash_value,sql_id,

? to_char(logon_time,'yyyy/mm/dd hh24:mi:ss') as login_time from v$session

where paddr in (select addr from v$process where spid in ('23226'))

) a,v$sql b

where a.sql_id? = b.SQL_ID(+)

4.kill占用大資源的session

Alter system kill session 'SID,SERIAL#'

解鎖：

1.查詢哪些對(duì)象被鎖：

select object_name,machine,s.sid,s.serial#

from v$locked_object l,dba_objects o ,v$session s

where l.object_id　=　o.object_id and l.session_id=s.sid;

2.下面的語句用來殺死一個(gè)進(jìn)程：

alter system kill session '524,1095'; (其中24,111分別是上面查詢出的sid,serial#)

3.再一次查詢目前鎖定的對(duì)象，若發(fā)現(xiàn)以上方法不能解除鎖定的表，則用以下方法：

3.1 執(zhí)行下面的語句獲得進(jìn)程（線程）號(hào)：

select spid, osuser, s.program

from v$session s,v$process p

where s.paddr=p.addr and s.sid=524 （524是上面的sid）

模擬oracle數(shù)據(jù)庫(kù)update鎖表現(xiàn)象及處理辦法

Session1創(chuàng)建測(cè)試表：

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

重新打開session 2：

SQL select * from test；

ID NAME

---------- --------------------

1 tom

2 lisa

3 xue

4 jia

update模擬鎖表

SQL update test set name='da' where name='tom';

1 row updated.

注：不提交

Session2查詢：

SQL select * from test；

ID NAME

---------- --------------------

1 tom

2 lisa

3 xue

4 jia

查看哪個(gè)表被鎖

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

查看是哪個(gè)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

殺掉對(duì)應(yīng)進(jìn)程

SQL alter system kill session'23,23';

System altered.

其中23為sid,23為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查詢：

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

重新連接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

oracle 表鎖住了什么原因

在對(duì)指定表做append操作，其他再做truncate時(shí)候，會(huì)產(chǎn)生鎖表，如下驗(yàn)證步驟，

1、創(chuàng)建測(cè)試表，

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

2、執(zhí)行append語句；并且不做提交，insert /*+append*/ into test_lock values(1,1);

3、再次執(zhí)行清表語句，truncate table test_lock;報(bào)鎖表錯(cuò)誤，

4、查看鎖表語句，發(fā)現(xiàn)被鎖表，

select b.object_name, t.*

from v$locked_object t, user_objects b

where t.object_id = b.object_id

oracle 表被鎖住 怎么解鎖

一般先查詢并找到被鎖定的表，解鎖代碼如下:

--釋放SESSION?SQL:?

--alter?system?kill?session?'sid,?serial#';?

ALTER?system?kill?session?'23,?1647';

oracle數(shù)據(jù)庫(kù)怎么鎖表

oracle數(shù)據(jù)庫(kù)分行級(jí)鎖和表級(jí)鎖。用select * from table-name for update完成行級(jí)鎖。用delete或update完成表級(jí)鎖。你鎖定的資源 別人會(huì)等待你的提交語句或回退語句完成以后再繼續(xù)進(jìn)行。