1、查詢耗時較久的sql語句

SELECT TOP 20
    total_worker_time/1000 AS [總消耗CPU 時間(ms)],execution_count [執行次數],
    qs.total_worker_time/qs.execution_count/1000 AS [平均消耗CPU 時間(ms)],
    last_execution_time AS [最後一次執行時間],max_worker_time /1000 AS [最大執行時間(ms)],
    SUBSTRING(qt.text,qs.statement_start_offset/2+1, 
        (CASE WHEN
 
 qs.statement_end_offset = -1 
        THEN DATALENGTH(qt.text) 
        ELSE qs.statement_end_offset END -qs.statement_start_offset)/2 + 1) 
    AS [使用CPU的語法], qt.text [完整語法],
    qt.dbid, dbname=db_name(qt.dbid),
    qt.objectid,object_name(qt.objectid,qt.dbid) ObjectName
FROM sys.dm_exec_query_stats qs WITH
 
(nolock)
CROSS apply sys.dm_exec_sql_text(qs.sql_handle) AS qt
WHERE execution_count>1
ORDER BY  total_worker_time DESC

SELECT s2.dbid,
s1.sql_handle,
(SELECT TOP 1 SUBSTRING(s2.text,statement_start_offset / 2+1 ,
( (CASE WHEN statement_end_offset = -1
THEN (LEN(CONVERT(nvarchar(max),s2.text)) *
 
 2)
ELSE statement_end_offset END) - statement_start_offset) / 2+1)) AS sql_statement,
execution_count,
plan_generation_num,
last_execution_time,
total_worker_time,
last_worker_time,
min_worker_time,
max_worker_time,
total_physical_reads,
last_physical_reads,
min_physical_reads,
max_physical_reads,
total_logical_writes,
last_logical_writes,
min_logical_writes,
max_logical_writes
FROM sys.dm_exec_query_stats AS s1
CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS s2
WHERE s2.objectid is null
ORDER BY last_worker_time desc,s1.sql_handle, s1.statement_start_offset, s1.statement_end_offset;

2、資料庫還原

USE [master]
RESTORE DATABASE ETM_Cloud FROM  DISK = N'E:\DB_backup\ETM_Cloud_FullBackup_2018_04_08_162313.bak' WITH  FILE = 1, 
MOVE N'ETM_Cloud' TO N'D:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\ETM_Cloud.mdf', 
MOVE N'ETM_Cloud_log' TO N'D:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\ETM_Cloud_log.ldf', 
NOUNLOAD,NORECOVERY,  REPLACE,  STATS = 5

GO


--注意一定要用NORECOVERY來還原備份
USE [master]
RESTORE DATABASE [ETM_Cloud] FROM  DISK = N'E:\DB_backup\ETM_Cloud_logBackup_2018_04_08_162313.bak' WITH  FILE = 1, 
NOUNLOAD,NORECOVERY,  REPLACE,  STATS = 5

GO

3、日誌清理(alwayson_clean_log)

--備份事務日誌，備份成NUL，就不用佔用硬碟空間
BACKUP LOG [ECloud] TO DISK='NUL:'
USE [ECloud]
GO
--收縮資料庫日誌檔案
DBCC SHRINKFILE(ECloud_log,10)
GO