SQL Server?械?????????
???????????? ???????[ 2014/6/10 13:15:00 ] ????????SQL ?????
????read uncommitted????????????
begin tran
set deadlock_priority low
update Earth set Animal='???'
waitfor delay '0:0:5' --???5?????????????
rollback tran
|
set tran isolation level read uncommitted
select * from Earth --?????????????????????? ?????
waitfor delay '0:0:5' --5???????????????
select * from Earth --???????????
|

????read committed????????????
????begin tran
????update Earth set Animal='???'
????waitfor delay '0:0:10' --???5?????????????
????rollback tran
????set tran isolation level read committed
????select * from Earth ---???????????????????
????update Earth set Animal='????1' --???????
????waitfor delay '0:0:10' --10????????????????????
????select * from Earth --?????????????????????
??????渭?????????????芯???????????伞?
????????????????
?????????????????????????????????????????????????????????????????????????????????????
?????????????????????????????????????????????????????????????????????????????????????????????????1222????
??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????胁???1222?????贸???????????????????????????
????--????????????-1
????select @@lock_timeout
????--???贸?????
????set lock_timeout 0 --?0?????????????????????????????????????????????????????????????????????掳?????hold??????
???????????????????????????????谢谢??over??
??????

???路???
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