SQL Server RESOURCE_SEMAPHORE ?????
???????????? ???????[ 2013/2/1 10:12:53 ] ????????
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?????????SQLServer??????еú??????????????Щ??飬??????????????????????????????????????????????????????????????????????????????????????????????μ???????????????????????Resource_semaphore????????????????????????????????
?????????????????е??????????????Resource_semaphore?????????????????????????Щ????IO??????????Щ???????????????????????????????????????????IO?????
????Resource_semaphore?????
??????????????ū??????????Resource_semaphore???????SQLServer??????????????????????????????????????????????????????????????????м??????SQLServer????????????????????????????????????????????????????棨required memory?????????棨additional memory??
??????????????????????hash?????????????棬???ν???“????”????????????????????????????????檔??????????????????????????????????????檔????????????棬???????????????浽?????С?
???????????????????????????????????????檔???????????????????????????????????????ò???????????????????????????*???ж????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????棨requested memory??????SQLServer?????????????Resource Semaphore?????????????????????????????????????е????????棬????????????Resource_Semaphore???????sysprocesses???????sys.dm_exec_request DMV?в????
??????Resource_semaphore????????μ??????????????????в?????????У?????????У??????????????????????????????У?Resource Semaphore?????δ?????????????棬??????????????????????????????檔???????????????棬????????渳???????Resource Semaphore??????????????儷????С???????????????????????????в?????Resource_Semaphore?????????????????????????????????????
???????Resource_Semaphore?????
????????1??
??????????????????Resource_Semaphore??????????
SELECT *
FROM sys.SYSPROCESSES
WHERE lastwaittype = 'RESOURCE_SEMAPHORE'
ORDER BY lastwaittype
?????????????????????????????????н????
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?????????1?е?????????????????????????ResourceSemaphore ??????????????????????????????????????????????????δ???????????????????????DMV???????У??????resource_semaphore_id?0????????????Щ???1??С??????????С?????С??5M???????????????????????????????????檔?????grantee_count??waiter_count??grantee_count???????????????????????????waiter_count????????е????????????????????
SELECT *
FROM sys.dm_exec_query_resource_semaphores
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