SQL常用性能相关脚本

--查询当前的事务

select
t2.session_id as SPID,
t2.transaction_id,
transaction_begin_time,
N‘已执行‘+ltrim(datediff(mi,transaction_begin_time,getdate()))+N‘分钟‘ as mi,
case transaction_type
when 1 then N‘读/写事务‘
when 2 then N‘只读事务‘
when 3 then N‘系统事务‘
when 4 then N‘分布式事务‘ end tran_Type,
case transaction_state
when 0 then N‘事务尚未完全初始化‘
when 1 then N‘事务已初始化但尚未启动‘
when 2 then N‘事务处于活动状态‘
when 3 then N‘事务已结束。该状态用于只读事务‘
when 4 then N‘已对分布式事务启动提交进程‘
when 5 then N‘事务处于准备就绪状态且等待解析‘
when 6 then N‘事务已提交‘
when 7 then N‘事务正在被回滚‘
when 0 then N‘事务已回滚‘
end transaction_state,
client_net_address,
client_tcp_port,
program_name,
t2.text

from
sys.dm_tran_active_transactions t1 join (
select
a.session_id,
transaction_id,
client_net_address,
client_tcp_port,
text,c.program_name
from sys.dm_tran_session_transactions a join (
select session_id,a2.text,client_net_address,client_tcp_port from sys.dm_exec_connections a1
cross apply sys.dm_exec_sql_text(a1.most_recent_sql_Handle) a2
) b on a.session_id=b.session_id
left join sys.dm_exec_sessions c on a.session_id=c.session_id
where is_user_transaction=1
)t2 on t1.transaction_ID=t2.transaction_ID
ORDER BY t2.transaction_id

----索引执行情况
SELECT objects.name ,
databases.name ,
indexes.name ,
user_seeks ,
user_scans ,
user_lookups ,
partition_stats.row_count
FROM sys.dm_db_index_usage_stats stats
LEFT JOIN sys.objects objects ON stats.object_id = objects.object_id
LEFT JOIN sys.databases databases ON databases.database_id = stats.database_id
LEFT JOIN sys.indexes indexes ON indexes.index_id = stats.index_id
AND stats.object_id = indexes.object_id
LEFT JOIN sys.dm_db_partition_stats partition_stats ON stats.object_id = partition_stats.object_id
AND indexes.index_id = partition_stats.index_id
WHERE 1 = 1
--AND databases.database_id = 7
AND objects.name IS NOT NULL
AND indexes.name IS NOT NULL
AND user_scans>0
ORDER BY user_scans DESC ,stats.object_id ,indexes.index_id

----最占用CPU
SELECT TOP 100 execution_count,
total_logical_reads /execution_count AS [Avg Logical Reads],
total_elapsed_time /execution_count AS [Avg Elapsed Time],
db_name(st.dbid) as [database name],
object_name(st.dbid) as [object name],
object_name(st.objectid) as [object name 1],
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) AS statement_text
FROM sys.dm_exec_query_stats AS qs CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS st
WHERE execution_count > 100 AND qs.creation_time > dateadd(day,-3,getdate())
ORDER BY 1 DESC;

---执行时间最长的命令

SELECT TOP 10 COALESCE(DB_NAME(st.dbid),
DB_NAME(CAST(pa.value as int))+‘*‘,‘Resource‘) AS DBNAME,
SUBSTRING(text,
-- starting value for substring
CASE WHEN statement_start_offset = 0
OR statement_start_offset IS NULL
THEN 1
ELSE statement_start_offset/2 + 1 END,
-- ending value for substring
CASE WHEN statement_end_offset = 0
OR statement_end_offset = -1
OR statement_end_offset IS NULL
THEN LEN(text)
ELSE statement_end_offset/2 END -
CASE WHEN statement_start_offset = 0
OR statement_start_offset IS NULL
THEN 1
ELSE statement_start_offset/2 END + 1
) AS TSQL,
total_logical_reads/execution_count AS AVG_LOGICAL_READS
FROM sys.dm_exec_query_stats
CROSS APPLY sys.dm_exec_sql_text(sql_handle) st
OUTER APPLY sys.dm_exec_plan_attributes(plan_handle) pa
WHERE attribute = ‘dbid‘
ORDER BY AVG_LOGICAL_READS DESC ;

----缺索引

SELECT TOP 30
[Total Cost] = ROUND(avg_total_user_cost * avg_user_impact * (user_seeks + user_scans),0)
, avg_user_impact, TableName = statement, [EqualityUsage] = equality_columns
, [InequalityUsage] = inequality_columns, [Include Cloumns] = included_columns
FROM sys.dm_db_missing_index_groups g
INNER JOIN sys.dm_db_missing_index_group_stats s
ON s.group_handle = g.index_group_handle
INNER JOIN sys.dm_db_missing_index_details d
ON d.index_handle = g.index_handle
ORDER BY [Total Cost] DESC;

--经常更新却很少使用的索引
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
SELECT
DB_NAME() AS DatabaseName
, SCHEMA_NAME(o.Schema_ID) AS SchemaName
, OBJECT_NAME(s.[object_id]) AS TableName
, i.name AS IndexName
, s.user_updates
, s.system_seeks + s.system_scans + s.system_lookups
AS [System usage]
INTO #TempUnusedIndexes
FROM sys.dm_db_index_usage_stats s
INNER JOIN sys.indexes i ON s.[object_id] = i.[object_id]
AND s.index_id = i.index_id
INNER JOIN sys.objects o ON i.object_id = O.object_id
WHERE 1=2
EXEC sp_MSForEachDB ‘USE [?];
INSERT INTO #TempUnusedIndexes
SELECT TOP 20
DB_NAME() AS DatabaseName
, SCHEMA_NAME(o.Schema_ID) AS SchemaName
, OBJECT_NAME(s.[object_id]) AS TableName
, i.name AS IndexName
, s.user_updates
, s.system_seeks + s.system_scans + s.system_lookups
AS [System usage]
FROM sys.dm_db_index_usage_stats s
INNER JOIN sys.indexes i ON s.[object_id] = i.[object_id]
AND s.index_id = i.index_id
INNER JOIN sys.objects o ON i.object_id = O.object_id
WHERE s.database_id = DB_ID()
AND OBJECTPROPERTY(s.[object_id], ‘‘IsMsShipped‘‘) = 0
AND s.user_seeks = 0
AND s.user_scans = 0
AND s.user_lookups = 0
AND i.name IS NOT NULL
ORDER BY s.user_updates DESC‘
SELECT TOP 20 * FROM #TempUnusedIndexes
WHERE DatabaseName = ‘agilepoint50‘ ORDER BY [user_updates] DESC
DROP TABLE #TempUnusedIndexes

---维护代价最高的索引
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
SELECT
DB_NAME() AS DatabaseName
, SCHEMA_NAME(o.Schema_ID) AS SchemaName
, OBJECT_NAME(s.[object_id]) AS TableName
, i.name AS IndexName
, (s.user_updates ) AS [update usage]
, (s.user_seeks + s.user_scans + s.user_lookups) AS [Retrieval usage]
, (s.user_updates) -
(s.user_seeks + s.user_scans + s.user_lookups) AS [Maintenance cost]
, s.system_seeks + s.system_scans + s.system_lookups AS [System usage]
, s.last_user_seek
, s.last_user_scan
, s.last_user_lookup
INTO #TempMaintenanceCost
FROM sys.dm_db_index_usage_stats s
INNER JOIN sys.indexes i ON s.[object_id] = i.[object_id]
AND s.index_id = i.index_id
INNER JOIN sys.objects o ON i.object_id = O.object_id
WHERE 1=2
EXEC sp_MSForEachDB ‘USE [?];
INSERT INTO #TempMaintenanceCost
SELECT TOP 20
DB_NAME() AS DatabaseName
, SCHEMA_NAME(o.Schema_ID) AS SchemaName
, OBJECT_NAME(s.[object_id]) AS TableName
, i.name AS IndexName
, (s.user_updates ) AS [update usage]
, (s.user_seeks + s.user_scans + s.user_lookups)
AS [Retrieval usage]
, (s.user_updates) -
(s.user_seeks + user_scans +
s.user_lookups) AS [Maintenance cost]
, s.system_seeks + s.system_scans + s.system_lookups AS [System usage]
, s.last_user_seek
, s.last_user_scan
, s.last_user_lookup
FROM sys.dm_db_index_usage_stats s
INNER JOIN sys.indexes i ON s.[object_id] = i.[object_id]
AND s.index_id = i.index_id
INNER JOIN sys.objects o ON i.object_id = O.object_id
WHERE s.database_id = DB_ID()
AND i.name IS NOT NULL
AND OBJECTPROPERTY(s.[object_id], ‘‘IsMsShipped‘‘) = 0
AND (s.user_seeks + s.user_scans + s.user_lookups) > 0
ORDER BY [Maintenance cost] DESC‘
SELECT top 20 * FROM #TempMaintenanceCost WHERE DatabaseName =‘agilepoint50‘ ORDER BY [Maintenance cost] DESC
DROP TABLE #TempMaintenanceCost

---表及数据库的空间占用
set nocount on
declare @db varchar(20)
set @db = db_name()
dbcc updateusage(@db) with no_infomsgs
go

create table #tblspace
(

数据表名称 varchar(50) null,
记录笔数 int null,
保留空间 varchar(15) null,
数据使用空间 varchar(15) null,
索引使用空间 varchar(15) null,
未使用空间 varchar(15) null,

)
declare @tblname varchar(50)
declare curtbls cursor for
select table_name from information_schema.tables
where table_type = ‘base table‘
open curtbls
Fetch next from curtbls into @tblname
while @@fetch_status = 0
begin
insert #tblspace exec sp_spaceused @tblname
fetch next from curtbls into @tblname
end
close curtbls
deallocate curtbls

select * from #tblspace order by
convert(int,left(保留空间,len(保留空间)-2)) desc
drop table #tblspace