step1:===查看缺失的索引
SELECT t4.name,t1.[statement],t1.object_id, t2.user_seeks, t2.user_scans,
t1.equality_columns, t1.inequality_columns,t1.included_columns,
case
--when t1.equality_columns is null and charindex(',',t1.inequality_columns)=0 and t1.included_columns is null
-- then 'create UNIQUE NONCLUSTERED INDEX IX_' + replace((replace((replace(t1.[statement],'[','_')),']','_')),'.','_') +'_'+ replace((replace((replace(isnull(t1.equality_columns,'1'),'[','_')),']','_')),'.','_') +'_'
-- +replace((replace((replace(isnull(t1.inequality_columns,'_2'),'[','_')),']','_')),'.','_') + ' ON '+ t1.[statement] + ' (' + t1.inequality_columns + ' ASC )'
when --t1.equality_columns is null and charindex(',',t1.inequality_columns)>0 and
t1.included_columns is null
then 'create NONCLUSTERED INDEX IX_' + replace((replace((replace((replace(t1.[statement],'[','_')),']','_')),'.','_')),',','_') +'_'
+replace(replace(replace(replace(replace(isnull(t1.equality_columns,'2'),' [',''),'[',''),'.',''),',',''),']','')
+replace((replace((replace((replace(isnull(t1.inequality_columns,'2'),'[','')),']','')),'.','')),',','_') + ' ON '+ t1.[statement] + ' (' +
case when t1.equality_columns is null then ' '
when charindex(',',t1.equality_columns)=0 then t1.equality_columns +' ASC '
when charindex(',',t1.equality_columns)>0 then replace(t1.equality_columns,',',' ASC,') + ' ASC '
end
+
case when charindex(',',t1.inequality_columns)=0 then ' ,'+t1.inequality_columns + ' ASC )'
when t1.inequality_columns is null then ' )'
when charindex(',',t1.inequality_columns)>0 then ' ,'+ replace(t1.inequality_columns,',',' ASC,') + ' ASC )'
end
when t1.included_columns is not null
then 'create NONCLUSTERED INDEX IX_' + replace((replace((replace((replace(t1.[statement],'[','_')),']','_')),'.','_')),',','_') +'_'
+replace(replace(replace(replace(replace(isnull(t1.equality_columns,'2'),' [',''),'[',''),'.',''),',',''),']','')
+replace((replace((replace((replace(replace(isnull(t1.inequality_columns,'2'),' [',''),'[','')),']','')),'.','')),',','_') + ' ON '+ t1.[statement] + ' (' +
case when t1.equality_columns is null then ' '
when charindex(',',t1.equality_columns)=0 then t1.equality_columns +' ASC '
when charindex(',',t1.equality_columns)>0 then replace(t1.equality_columns,',',' ASC,') + ' ASC '
end
+
case when t1.equality_columns is null then ''+t1.inequality_columns + ' ASC )'
when charindex(',',t1.inequality_columns)=0 then ' ,'+t1.inequality_columns + ' ASC )'
when t1.inequality_columns is null then ' )'
when charindex(',',t1.inequality_columns)>0 then ' ,'+ replace(t1.inequality_columns,',',' ASC,') + ' ASC )'
end
+ ' INCLUDE ( ' + t1.included_columns + ' )'
end as '建立索引的语句'
FROM sys.dm_db_missing_index_groups AS t3
join sys.dm_db_missing_index_details AS t1
on t1.index_handle = t3.index_handle
join sys.dm_db_missing_index_group_stats AS t2
on t2.group_handle = t3.index_group_handle
join sys.databases AS t4
on t1.database_id = t4.database_id
WHERE t1.database_id = DB_ID() --AND object_id = OBJECT_ID('dealer.升级码_经销商添加升级码')
order by t2.user_seeks desc
step2：===查看锁的语句
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED ;
with C as
(
SELECT DB_NAME(resource_database_id) AS DatabaseName
, request_session_id
, resource_type
, CASE
WHEN resource_type = 'OBJECT'
THEN OBJECT_NAME(resource_associated_entity_id)
WHEN resource_type IN ('KEY', 'PAGE', 'RID')
THEN (SELECT OBJECT_NAME(OBJECT_ID)
FROM sys.partitions p
WHERE p.hobt_id = l.resource_associated_entity_id)
END AS resource_type_name
, request_status
, request_mode
FROM sys.dm_tran_locks l
WHERE request_session_id !=@@spid
)
select C.DatabaseName,C.request_session_id,C.request_mode,C.request_status,C.resource_type,
C.resource_type_name,b.loginame,b.program_name,m.plan_handle,f.text,gp.query_plan
from C join sys.sysprocesses as b
on C.request_session_id = b.spid
join sys.dm_exec_query_stats as m
on b.sql_handle = m.sql_handle
CROSS APPLY sys.dm_exec_sql_text(b.sql_handle) as f
CROSS APPLY sys.dm_exec_query_plan(m.plan_handle) as gp
where resource_type <> 'database' ORDER BY request_session_id
step3:
===最占I/O的20个语句和他们的执行计划
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
SELECT TOP 20
[Total IO] = (qs.total_logical_reads + qs.total_logical_writes)
, [Average IO] = (qs.total_logical_reads + qs.total_logical_writes) /
qs.execution_count
, qs.execution_count
, SUBSTRING (qt.text,(qs.statement_start_offset/2) + 1,
((CASE WHEN qs.statement_end_offset = -1
THEN LEN(CONVERT(NVARCHAR(MAX), qt.text)) * 2
ELSE qs.statement_end_offset
END - qs.statement_start_offset)/2) + 1) AS [Individual Query]
, qt.text AS [Parent Query]
, DB_NAME(qt.dbid) AS DatabaseName
, qp.query_plan
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
ORDER BY [Total IO] DESC
step4
===查看没关闭事务的空闲进程,当前未完成的事务
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED ;
with C as
(
SELECT es.session_id, es.login_name, es.host_name, est.text
, cn.last_read, cn.last_write, es.program_name
FROM sys.dm_exec_sessions es
INNER JOIN sys.dm_tran_session_transactions st
ON es.session_id = st.session_id
INNER JOIN sys.dm_exec_connections cn
ON es.session_id = cn.session_id
CROSS APPLY sys.dm_exec_sql_text(cn.most_recent_sql_handle) est
LEFT OUTER JOIN sys.dm_exec_requests er
ON st.session_id = er.session_id
AND er.session_id IS NULL
)
select [session_id],[login_name],[host_name],[text],[last_read],[last_write],[program_name] from C
step5:
===查看cpu占用
select * from sys.sysprocesses order by cpu desc
select * from sys.sysprocesses as s
cross apply sys.dm_exec_sql_text(s.sql_handle) as t order by cpu desc
查询CPU占用高的语句
SELECT TOP 10
total_worker_time/execution_count AS avg_cpu_cost, plan_handle,
execution_count,
(SELECT SUBSTRING(text, statement_start_offset/2 + 1,
(CASE WHEN statement_end_offset = -1
THEN LEN(CONVERT(nvarchar(max), text)) * 2
ELSE statement_end_offset
END - statement_start_offset)/2)
FROM sys.dm_exec_sql_text(sql_handle)) AS query_text
FROM sys.dm_exec_query_stats
ORDER BY [avg_cpu_cost] DESC