Bonjour,
Vous devriez trouver quels événements d'attente se trouvent dans la base de données SQL Server.
Pour résoudre la lenteur de la base de données SQL Server, vous devez rechercher les événements d'attente qui existent dans la base de données.
Vous pouvez trouver les événements d'attente de la base de données avec la requête suivante.
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