Oracle的锁表与解锁

void — Sun, 06 Jul 2014 12:51:00 GMT

SELECT /*+ rule */ s.username,
decode(l.type,'TM','TABLE LOCK',
'TX','ROW LOCK',
NULL) LOCK_LEVEL,
o.owner,o.object_name,o.object_type,
s.sid,s.serial#,s.terminal,s.machine,s.program,s.osuser
FROM v$session s,v$lock l,dba_objects o
WHERE l.sid = s.sid
AND l.id1 = o.object_id(+)
AND s.username is NOT Null

--kill session语句
alter system kill session'50,492';
--以下几个为相兌��
SELECT * FROM v$lock;
SELECT * FROM v$sqlarea;
SELECT * FROM v$session;
SELECT * FROM v$process ;
SELECT * FROM v$locked_object;
SELECT * FROM all_objects;
SELECT * FROM v$session_wait;
--1.查出锁定object的session的信息以及被锁定的object�?br />SELECT l.session_id sid, s.serial#, l.locked_mode,l.oracle_username,
l.os_user_name,s.machine, s.terminal, o.object_name, s.logon_time
FROM v$locked_object l, all_objects o, v$session s
WHERE l.object_id = o.object_id
AND l.session_id = s.sid
ORDER BY sid, s.serial# ;
--2.查出锁定表的session的sid, serial#,os_user_name, machine name, terminal和执行的语句
--比上面那�D�多出sql_text和action
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$locked_object l
WHERE l.session_id = s.sid
AND s.prev_sql_addr = a.address
ORDER BY sid, s.serial#;
--3.查出锁定表的sid, serial#,os_user_name, machine_name, terminal�Q�锁的type,mode
SELECT s.sid, s.serial#, s.username, s.schemaname, s.osuser, s.process, s.machine,
s.terminal, s.logon_time, l.type
FROM v$session s, v$lock l
WHERE s.sid = l.sid
AND s.username IS NOT NULL
ORDER BY sid;

�q�个语句��查扑ֈ�数据库中所有的DML语句产生的锁�Q�还可以发现�Q?br />��M��DML语句其实产生了两个锁�Q�一个是表锁�Q�一个是行锁�?br />杀锁命�?/strong>
alter system kill session 'sid,serial#'
SELECT /*+ rule */ s.username,
decode(l.type,'TM','TABLE LOCK',
'TX','ROW LOCK',
NULL) LOCK_LEVEL,
o.owner,o.object_name,o.object_type,
s.sid,s.serial#,s.terminal,s.machine,s.program,s.osuser
FROM v$session s,v$lock l,dba_objects o
WHERE l.sid = s.sid
AND l.id1 = o.object_id(+)
AND s.username is NOT NULL
如果发生了锁�{�待�Q�我们可能更想知道是谁锁了表而引赯��的等�?br />以下的语句可以查询到谁锁了表�Q�而谁在等待�?br />以上查询�l�果是一个树状结构，如果有子节点�Q�则表示有等待发生�?br />如果想知道锁用了哪个回滚�D�，�q�可以关联到V$rollname�Q�其中xidusn��是回滚�D늚�USN
col user_name format a10
col owner format a10
col object_name format a10
col object_type format a10
SELECT /*+ rule */ lpad(' ',decode(l.xidusn ,0,3,0))||l.oracle_username User_name,
o.owner,o.object_name,o.object_type,s.sid,s.serial#
FROM v$locked_object l,dba_objects o,v$session s
WHERE l.object_id=o.object_id
AND l.session_id=s.sid
ORDER BY o.object_id,xidusn DESC

void 2014-07-06 20:51 发表评论

新装 Oracle 建库(实例)步骤

void — Fri, 23 May 2014 08:02:00 GMT

Oracle版本�Q?1gR2
安装好Oracle后，需要创��Z��个实例（也就是库�Q��?/div>

ORACLE创徏实例�Q��用ORAHOME目录下的"Configuration and Migration Tools"下的"Database Configuration Assistant"工具�?/div>

建好库（实例�Q�后�Q��用用户名“system”登陆刚才建好的库�?/div>

执行下面的语句�?br />

--表空�?/span>
CREATE TABLESPACE nansha
DATAFILE 'D:\Oracle\oradata\nansha\nansha_data.dbf' size 800M
         EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;

--索引表空�?/span>
CREATE TABLESPACE nansha_index
DATAFILE 'D:\Oracle\oradata\nansha\nansha_index.dbf' size 512M
         EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;

--2.建用�?/span>
create user chenpeng identified by chenpeng
default tablespace nansha;

--3.赋权
grant connect,resource to chenpeng;
grant create any sequence to chenpeng;
grant create any table to chenpeng;
grant delete any table to chenpeng;
grant insert any table to chenpeng;
grant select any table to chenpeng;
grant unlimited tablespace to chenpeng;
grant execute any procedure to chenpeng;
grant update any table to chenpeng;
grant create any view to chenpeng;

--PS.赋权DBA
--grant dba to chenpeng

commit;

用刚才新建的用户登陆�Q�新建）�?/div>

--��试�Q�新��Z��张表

create table usptotest

(

pn varchar(10) not null,

isd varchar(20) default '' not null ,

title varchar(150) default '' not null ,

abst varchar(2000) default '' not null ,

appno varchar(20) default '' not null ,

appdate varchar(20) default '' not null ,

inventor varchar(200) default '' not null ,

assignee_name varchar(50) default '' not null ,

assignee_country varchar(20) default '' not null ,

assignee_city varchar(20) default '' not null ,

assignee_state varchar(10) default '' not null,

primary key (pn)

)

void 2014-05-23 16:02 发表评论

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Oracle的锁表与解锁

新装 Oracle 建库(实例)步骤