SQLSERVER數(shù)據(jù)庫(kù)鎖表

1.?查看被鎖的表

select?request_session_id???spid,OBJECT_NAME(resource_associated_entity_id)?tableName

from?sys.dm_tran_locks?where?resource_type='OBJECT'

2.?解除表的鎖定

declare?@spid??int

Set?@spid??=?57?--鎖表進(jìn)程

declare?@sql?varchar(1000)

set?@sql='kill?'+cast(@spid??as?varchar)

exec(@sql)

3.?查詢數(shù)據(jù)庫(kù)死鎖的信息

CREATE?procedure?sp_who_lock

as

begin

declare?@spid?int

declare?@blk?int

declare?@count?int

declare?@index?int

declare?@lock?tinyint

set?@lock=0

create?table?#temp_who_lock

(

id?int?identity(1,1),

spid?int,

blk?int

)

if?@@error<>0?return?@@error

insert?into?#temp_who_lock(spid,blk)

select?0?,blocked

from?(select?*?from?master..sysprocesses?where?blocked>0)a

where?not?exists(select?*?from??master..sysprocesses?where?a.blocked?=spid?and?blocked>0)

union?select?spid,blocked?from??master..sysprocesses?where?blocked>0

if?@@error<>0?return?@@error

select?@count=count(*),@index=1?from?#temp_who_lock

if?@@error<>0?return?@@error

if?@count=0

begin

select?'沒有阻塞和死鎖信息'

return?0

end

while?@index<=@count

begin

if?exists(select?1?from?#temp_who_lock?a?where?id>@index?and?exists(select?1?from?#temp_who_lock?where?id<=@index?and?a.blk=spid))

begin

set?@lock=1

select?@spid=spid,@blk=blk?from?#temp_who_lock?where?id=@index

select?'引起數(shù)據(jù)庫(kù)死鎖的是:?'+?CAST(@spid?AS?VARCHAR(10))?+?'進(jìn)程號(hào),其執(zhí)行的SQL語(yǔ)法如下'

select??@spid,?@blk

dbcc?inputbuffer(@spid)

dbcc?inputbuffer(@blk)

end

set?@index=@index+1

end

if?@lock=0

begin

set?@index=1

while?@index<=@count

begin

select?@spid=spid,@blk=blk?from?#temp_who_lock?where?id=@index

if?@spid=0

select?'引起阻塞的是:'+cast(@blk?as?varchar(10))+?'進(jìn)程號(hào),其執(zhí)行的SQL語(yǔ)法如下'

else

select?'進(jìn)程號(hào)SPID：'+?CAST(@spid?AS?VARCHAR(10))+?'被'?+?'進(jìn)程號(hào)SPID：'+?CAST(@blk?AS?VARCHAR(10))?+'阻塞,其當(dāng)前進(jìn)程執(zhí)行的SQL語(yǔ)法如下'

dbcc?inputbuffer(@spid)

dbcc?inputbuffer(@blk)

set?@index=@index+1

end

end

drop?table?#temp_who_lock

return?0

end

GO

4.??設(shè)置數(shù)據(jù)庫(kù)鎖的級(jí)別

READ_COMMITTED_SNAPSHOT??ON

使用基于行版本控制的隔離級(jí)別?(SQL?Server?2005?支持?)?：開啟下面的選項(xiàng)后，?SELECT?不會(huì)對(duì)請(qǐng)求的資源加?S?鎖，不加鎖或者加?Sch-S?鎖，

從而將讀與寫操作之間發(fā)生的死鎖幾率降至最低；而且不會(huì)發(fā)生臟讀

ALTER?DATABASE?EBCMKS?SET?ALLOW_SNAPSHOT_ISOLATION?ON

ALTER?DATABASE?EBCMKS?SET?READ_COMMITTED_SNAPSHOT?ON

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