SqlServer优化排查

--查看死锁进程spid
sp_who2 active 
--进程持续排行cpu：
SELECT * FROM sys.sysprocesses order by cpu desc

--查询造成阻塞或死锁的Sql语句：
dbcc inputbuffer(520)
--查看数据库列表
select* from master..sysdatabases
查看锁表：
select   request_session_id   spid,OBJECT_NAME(resource_associated_entity_id) tableName   
from   sys.dm_tran_locks where resource_type='OBJECT'
--杀死进程：
kill 520
--找出执行最慢的SQL语句（适用于SQL SERVER 2005及其以上版本）
--https://blog.csdn.net/CSDN515/article/details/120428652
SELECT  
    (total_elapsed_time / execution_count)/1000 N'平均时间ms'  
    ,total_elapsed_time/1000 N'总花费时间ms'  
    ,total_worker_time/1000 N'所用的CPU总时间ms'  
    ,total_physical_reads N'物理读取总次数'  
    ,total_logical_reads/execution_count N'每次逻辑读次数'  
    ,total_logical_reads N'逻辑读取总次数'  
    ,total_logical_writes N'逻辑写入总次数'  
    ,execution_count N'执行次数'  
    ,SUBSTRING(st.text, (qs.statement_start_offset/2) + 1  
    ,((CASE statement_end_offset  
    WHEN -1 THEN DATALENGTH(st.text)  
    ELSE qs.statement_end_offset END  
    - qs.statement_start_offset)/2) + 1) N'执行语句'  
    ,creation_time N'语句编译时间'  
    ,last_execution_time N'上次执行时间'  
    FROM  
    sys.dm_exec_query_stats AS qs CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) st  
WHERE  
SUBSTRING(st.text, (qs.statement_start_offset/2) + 1,  
((CASE statement_end_offset  
WHEN -1 THEN DATALENGTH(st.text)  
ELSE qs.statement_end_offset END  
- qs.statement_start_offset)/2) + 1) not like 'fetch%'  
ORDER BY  
total_elapsed_time / execution_count DESC;  

  set statistics profile on
set statistics io on
set statistics time on
go
 --sql
go
set statistics profile off
set statistics io off
set statistics time off  

--查询数据库中表数据条数排序
SELECT B.NAME,A.ROW_COUNT FROM SYS.DM_DB_PARTITION_STATS A,
SYS.OBJECTS B
WHERE A.OBJECT_ID=B.OBJECT_ID
AND A.INDEX_ID<=1
AND B.TYPE='U'AND A.ROW_COUNT>0
ORDER BY  ROW_COUNT  DESC
--查询数据库表占用空间和记录情况
SELECT t.NAME AS TableName,
         s.Name AS SchemaName,
         p.rows AS RowCounts,
         SUM(a.total_pages) * 8 AS TotalSpaceKB,
         CAST(ROUND(((SUM(a.total_pages) * 8) / 1024.00),
         2) AS NUMERIC(36,
         2)) AS TotalSpaceMB,
         SUM(a.used_pages) * 8 AS UsedSpaceKB,
         CAST(ROUND(((SUM(a.used_pages) * 8) / 1024.00),
         2) AS NUMERIC(36,
         2)) AS UsedSpaceMB,
         (SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceKB,
         CAST(ROUND(((SUM(a.total_pages) - SUM(a.used_pages)) * 8) / 1024.00,
         2) AS NUMERIC(36,
         2)) AS UnusedSpaceMB
FROM sys.tables t
INNER JOIN sys.indexes i
    ON t.OBJECT_ID = i.object_id
INNER JOIN sys.partitions p
    ON i.object_id = p.OBJECT_ID
        AND i.index_id = p.index_id
INNER JOIN sys.allocation_units a
    ON p.partition_id = a.container_id LEFT OUTER
JOIN sys.schemas s
    ON t.schema_id = s.schema_id
WHERE 1=1
        AND t.is_ms_shipped = 0
        AND i.OBJECT_ID > 255
GROUP BY  t.Name, s.Name, p.Rows
ORDER BY  p.rows desc