一些锁的示例

 

use  userDatabase
go
if   exists ( select   1   from  sys.tables  where  name = ' t ' )
     drop   table  t
create   table  t(c1  int ,c2  int )
create   index  index1  on  t(c1)
insert   into  t  values ( 1 , 1 )

 

--UPDATE lock

set   transaction   isolation   level   repeatable   read
begin   tran
update  t  set  c2 = 6   where  c1 = 1
select  resource_type,resource_description,resource_associated_entity_id,request_mode,request_type,request_status  
from  sys.dm_tran_locks  where  request_session_id = @@spid     order   by  resource_type
rollback
go

 

--SIX

set   transaction   isolation   level   repeatable   read  
begin   tran  
select   * from  t  with  (paglock) 
update  t  set  c2 = 6   where  c1 = 1  
select  resource_type,resource_description,resource_associated_entity_id,request_mode,request_type,request_status 
from  sys.dm_tran_locks  where  request_session_id = @@spid   order   by  resource_type 
rollback  
go  

 

 

 

--SIU

 

set   transaction   isolation   level   repeatable   read  
begin   tran  
select   * from  t  with  (paglock, index = index1) 
update  t  set  c2 = 6   where  c1 = 1  
select  resource_type,resource_description,resource_associated_entity_id,request_mode,request_type,request_status 
from  sys.dm_tran_locks  where  request_session_id = @@spid   order   by  resource_type 
rollback  
go

 

--1:167为索引页,1:165为数据页

 

 

--UIX

set   transaction   isolation   level   repeatable   read  
begin   tran  
update  t  with (paglock)  set  c2 = 6   where  c1 = 1  
update  t  set  c1 = 6   where  c1 = 1  
select  resource_type,resource_description,resource_associated_entity_id,request_mode,request_type,request_status 
from  sys.dm_tran_locks  where  request_session_id = @@spid   order   by  resource_type 
rollback  
go  

 

 

 

 

 

 

 

Request_status

create   table  ##session(sessionID  int ) 

 

WAIT

Time	Transaction 1		Transaction 2
1	set transaction isolation level  read committed		set transaction isolation level  read committed
2			Begin tran
3	Delete from ##session go insert into ##session values(@@SPID) go		update t set c2=6 where c1=1
4	select *from t
5			select resource_type,resource_description,resource_associated_entity_id,request_mode,request_type,request_status from sys.dm_tran_locks where request_session_id in (select sessionID from ##session)
6			rollback

   

 

 

CONVERT

Time	Transaction 1		Transaction 2
1	set transaction isolation level  read committed		set transaction isolation level repeatable read
2			Begin tran
3	Delete from ##session go insert into ##session values(@@SPID)		select *from t
4	update t set c2=6 where c1=1
5			select resource_type,resource_description,resource_associated_entity_id,request_mode,request_type,request_status from sys.dm_tran_locks where request_session_id in (select sessionID from ##session)
6			rollback