Ciao,
Dovresti trovare quale degli eventi di attesa si trova nel database di SQL Server.
Per risolvere la lentezza del database di SQL Server, dovresti trovare quali eventi di attesa esistono nel database.
Puoi trovare gli eventi di attesa del database con la seguente query.
with waits as (select wait_type, wait_time_ms / 1000.0 as waits, (wait_time_ms - signal_wait_time_ms) / 1000.0 as resources, signal_wait_time_ms / 1000.0 as signals, waiting_tasks_count as waitcount, 100.0 * wait_time_ms / sum (wait_time_ms) over() as percentage, row_number() over(order by wait_time_ms desc) as rownum from sys.dm_os_wait_stats where wait_type not in ( N'CLR_SEMAPHORE', N'LAZYWRITER_SLEEP', N'RESOURCE_QUEUE', N'SQLTRACE_BUFFER_FLUSH', N'SLEEP_TASK', N'SLEEP_SYSTEMTASK', N'WAITFOR', N'HADR_FILESTREAM_IOMGR_IOCOMPLETION', N'CHECKPOINT_QUEUE', N'REQUEST_FOR_DEADLOCK_SEARCH', N'XE_TIMER_EVENT', N'XE_DISPATCHER_JOIN', N'LOGMGR_QUEUE', N'FT_IFTS_SCHEDULER_IDLE_WAIT', N'BROKER_TASK_STOP', N'CLR_MANUAL_EVENT', N'CLR_AUTO_EVENT', N'DISPATCHER_QUEUE_SEMAPHORE', N'TRACEWRITE', N'XE_DISPATCHER_WAIT', N'BROKER_TO_FLUSH', N'BROKER_EVENTHANDLER', N'FT_IFTSHC_MUTEX', N'SQLTRACE_INCREMENTAL_FLUSH_SLEEP', N'DIRTY_PAGE_POLL', N'SP_SERVER_DIAGNOSTICS_SLEEP') ) select w1.wait_type as waittype, cast (w1.waits as decimal(14, 2)) wait_s, cast (w1.resources as decimal(14, 2)) resource_s, cast (w1.signals as decimal(14, 2)) signal_s, w1.waitcount wait_count, cast (w1.percentage as decimal(4, 2)) percentage, cast ((w1.waits / w1.waitcount) as decimal (14, 4)) avgWait_s, cast ((w1.resources / w1.waitcount) as decimal (14, 4)) avgResource_s, cast ((w1.signals / w1.waitcount) as decimal (14, 4)) avgSignal_s from waits as w1 inner join waits as w2 on w2.rownum <= w1.rownum group by w1.rownum, w1.wait_type, w1.waits, w1.resources, w1.signals, w1.waitcount, w1.percentage having sum (w2.percentage) - w1.percentage < 95; -- percentage threshold
