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SQL Server性能

  • 项目

在多站点层次结构中，Configuration Manager使用SQL Server复制在站点之间传输数据。 有关详细信息，请参阅 数据库复制。

使用以下关系图开始排查可能影响复制状态SQL Server性能：

排查SQL Server性能问题的关系图

查询

此关系图使用以下查询：

确保已清理SQL Server更改跟踪表

DECLARE @RetentionUnit INT = 0;
DECLARE @RetentionPeriod INT = 0;
DECLARE @CTCutOffTime DATETIME;
DECLARE @CTMinTime DATETIME;

SELECT @RetentionPeriod=retention_period,  
    @RetentionUnit=retention_period_units  
FROM sys.change_tracking_databases  
WHERE database_id = DB_ID();

IF @RetentionUnit = 1
    SET @CTCutOffTime = DATEADD(MINUTE,-@RetentionPeriod,GETUTCDATE())
ELSE IF @RetentionUnit = 2
    SET @CTCutOffTime = DATEADD(HOUR,-@RetentionPeriod,GETUTCDATE())
ELSE IF @RetentionUnit = 3
    SET @CTCutOffTime = DATEADD(DAY,-@RetentionPeriod,GETUTCDATE())

-- give a buffer of two days
SET @CTCutOffTime = DATEADD(DAY, -2, @CTCutOffTime)
select top 1 @CTMinTime=commit_time from sys.dm_tran_commit_table order by commit_ts asc
IF @CTMinTime < @CTCutOffTime
    PRINT 'there is change tracking backlog, please contact Microsoft support'

更改处理SQL Server服务代理消息的当前会话

select
       req.session_id
       ,req.blocking_session_id
       ,req.last_wait_type
       ,req.wait_type
       ,req.wait_resource
       ,t.text
from sys.dm_exec_sessions s
inner join sys.dm_exec_requests req on s.Session_id=req.session_id
cross apply sys.dm_exec_sql_text(sql_handle) t
where program_name='SMS_data_replication_service'

检查请求过多内存的会话

SELECT * FROM sys.dm_exec_query_memory_grants
ORDER BY requested_memory_kb DESC

检查使用过多锁的会话

SELECT TOP 10 request_session_id,
program_name = (SELECT program_name FROM sys.dm_exec_sessions WHERE session_id=request_session_id),
COUNT (*) num_locks
FROM sys.dm_tran_locks
GROUP BY request_session_id
ORDER BY count (*) DESC

另请参阅

SQL Server 配置