第一步分析实例级等待 sys.[dm_os_wait_stats]视图从sql实例启动到目前为止累计值,你可以执行DBCC SQLPERF('sys.dm_os_wait_stats',CLEAR)清空累计 DBCCSQLPERF('sys.dm_os_wait_stats',CLEAR) SELECT[wait_type],[waiting_tasks_count],[wait_time_ms]
SQL Server has encountered %d occurrence(s) of cachestore flush for the '%s' cachestore (part of plan cache) due to 'DBCC FREEPROCCACHE' or 'DBCC FREESYSTEMCACHE' operations. 每隔五分钟,只要缓存在这段时间间隔内得到刷新,此消息就记录一次。 结果集 DBCC FREESYSTEMCACHE 返...
I hear you loud and clear. I want your life to be as easy as possible, and that’s great. However, given your supreme intelligence and good looks, at some point, someone’s going to hire you into another company where you don’t have the control that you have now. At that point,...
UPDATE 是一种数据操作语言 (DML) 操作,它是在表变量上执行的,因此它只能有串行执行计划。 The execution plan is being cached and you must clear this cache. There is no way for you to change the execution plan for an operation on a table variable. There is no way for you to change the ex...
Below are the results for both queries executed after clearing the cache. Reads Duration (ms) LEFT OUTER JOIN 125 8 LAG 46 3 Obviously using LAG has a clear performance advantage. However, to achieve better performance you need to cover those columns (in the above scenario, it will be Year...
SQL Server has encountered %d occurrence(s) of cachestore flush for the '%s' cachestore (part of plan cache) due to 'DBCC FREEPROCCACHE' or 'DBCC FREESYSTEMCACHE' operations. 只要在該時間間隔內快取發生排清,這個訊息就會每五分鐘記錄一次。
At this point, it starts to become clear that how we write a query is fundamental to achieving good performance. But it is equally important to make sure the Query Optimizer is given a chance to do its job to produce an efficient query plan. That job is dependent on having metadata ...
This DMF gives a clear picture of the databases having high number of VLF’s along with many other useful columns. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 WITH DatbaseVLF AS( SELECT DB_ID(dbs.[name]) AS DatabaseID, dbs.[name] AS...
So on a fresh restart you can see by checking type MEMORYCLERK_SQLCLR from dm_os_memory_clerks that we are clear After execution of the CLR function you can see the differences Call these functions as tsqlLine number On/Off|Show/Hide|Select all ...
I broke this question up into two questions because I wasn’t clear if you wanted existing subscriptions or executed subscriptions. Executed The ExecutionLog3 view in the report server database will have this information for you. You can filter the data on the RequestType field to show you on...