[MSSQL]系统管理常用语句

(1)@@S

 SELECT
 @@CONNECTIONS AS TotalConnections
 ,@@TIMETICKS AS TimeTicks
 ,@@CPU_BUSY AS TotalCPUBusyTime
 ,@@IDLE AS TotalCPUIdleTime
 ,@@IO_BUSY AS TotalIOBusyTime
 ,@@PACK_RECEIVED AS TotalReceivedPackets
 ,@@PACK_SENT AS TotalSentPackets
 ,@@PACKET_ERRORS AS TotalErrorsInNetworkPackets
 ,@@TOTAL_READ AS TotalPhysicalReadOperations
 ,@@TOTAL_WRITE AS TotalWriteOperations
 ,@@TOTAL_ERRORS AS TotalReadWriteErrors

(2)cputime

--必须在master下执行
SELECT 
      total_cpu_time,    
      total_execution_count,
      number_of_statements,
      s2.text  
   FROM 
      (SELECT TOP 50 
            SUM(qs.total_worker_time) AS total_cpu_time, 
            SUM(qs.execution_count) AS total_execution_count,
            COUNT(*) AS  number_of_statements, 
            qs.sql_handle  
      FROM 
            sys.dm_exec_query_stats AS qs
      GROUP BY qs.sql_handle 
      ORDER BY SUM(qs.total_worker_time) DESC) AS stats
      CROSS APPLY sys.dm_exec_sql_text(stats.sql_handle) AS s2




二、
select
highest_cpu_queries.plan_handle,
    highest_cpu_queries.total_worker_time,
 q.dbid,
    q.objectid,
    q.number,
    q.encrypted,
 q.[text]
from
(select top 50
qs.plan_handle,
        qs.total_worker_time
from
sys.dm_exec_query_stats qs
order by qs.total_worker_time desc) as highest_cpu_queries
cross apply sys.dm_exec_sql_text(plan_handle) as q
order by highest_cpu_queries.total_worker_time desc

(3)IO情况

select 
b.name,
c.name ,
c.physical_name,a.num_of_bytes_read,
a.num_of_bytes_written,
a.io_stall_read_ms,a.io_stall_write_ms,
a.io_stall 

from sys.dm_io_virtual_file_stats (null,null) as a ,
sys.databases b, sys.master_files c 
where a.database_id=b.database_id and a.file_id =c.file_id
and a.database_id=c.database_id 

--挂起的IO请求。
select database_id,file_id,
io_stall,io_pending_ms_ticks,
scheduler_address from sys.dm_io_virtual_file_stats(null,null) t1,
sys.dm_io_pending_io_requests t2
where t1.file_handle =t2.io_handle


如果是SQLServer 2005以上的版本。
可以从sys.dm_io_virtual_file_stats查看各个数据库的文件的读写情况。
但是只是保存自上次实例启动之后的统计信息。

select * from sys.dm_io_virtual_file_stats(null,null)

(4)sp_who_lock

create procedure sp_who_lock
as
begin
declare @spid int,@bl int,
@intTransactionCountOnEntry int,
         @intRowcount    int,
         @intCountProperties   int,
         @intCounter    int

create table #tmp_lock_who (
 id int identity(1,1),
 spid smallint,
 bl smallint)

IF @@ERROR<>0 RETURN @@ERROR

insert into #tmp_lock_who(spid,bl) select 0 ,blocked
    from (select * from sysprocesses where blocked>0 ) a 
    where not exists(select * from (select * from sysprocesses where blocked>0 ) b 
    where a.blocked=spid)
    union select spid,blocked from sysprocesses where blocked>0

IF @@ERROR<>0 RETURN @@ERROR 

-- 找到临时表的记录数
select @intCountProperties = Count(*),@intCounter = 1
from #tmp_lock_who

IF @@ERROR<>0 RETURN @@ERROR 

if @intCountProperties=0
select ‘现在没有阻塞和死锁信息‘ as message

-- 循环开始
while @intCounter <= @intCountProperties
begin
-- 取第一条记录
select @spid = spid,@bl = bl
from #tmp_lock_who where Id = @intCounter 
begin
if @spid =0 
             select ‘引起数据库死锁的是: ‘+ CAST(@bl AS VARCHAR(10)) + ‘进程号,其执行的SQL语法如下‘
else
             select ‘进程号SPID：‘+ CAST(@spid AS VARCHAR(10))+ ‘被‘ + ‘进程号SPID：‘+ CAST(@bl AS VARCHAR(10)) +‘阻塞,其当前进程执行的SQL语法如下‘
DBCC INPUTBUFFER (@bl )
end 

-- 循环指针下移
set @intCounter = @intCounter + 1
end

drop table #tmp_lock_who


return 0
end

(5)sp_who3

SELECT  dess.session_id AS [SPID],
CASE der.status WHEN ‘background‘ THEN ‘BACKGROUND‘ ELSE der.status END AS ‘Status‘,
CONVERT(varchar(32),dess.original_login_name) AS [Login],
ISNULL(dess.host_name,‘.‘) AS [HostName],CASE CONVERT(varchar(12),der.blocking_session_id) WHEN ‘0‘ THEN ‘.‘
ELSE CONVERT(varchar(12),der.blocking_session_id) END AS BlkBy,DB_NAME(der.database_id) AS DBName,
der.command AS ‘Command‘,der.cpu_time AS [CPUTime],der.logical_reads AS [DiskIO],dess.last_request_start_time
AS [LastBatch],ISNULL(dess.program_name,‘‘) AS [ProgramName],ISNULL(dest.text,‘‘) AS ‘CurrentQuery‘,
ISNULL(deqp.query_plan,‘‘) AS ‘CurrentPlan‘,rgwg.name AS [ResourceWorkgroupName]
FROM sys.dm_exec_requests der 
INNER JOIN sys.resource_governor_workload_groups rgwg ON der.group_id = rgwg.group_id 
INNER JOIN sys.dm_exec_sessions dess ON der.session_id = dess.session_id
OUTER APPLY sys.dm_exec_sql_text(der.sql_handle) dest
OUTER APPLY sys.dm_exec_query_plan(der.plan_handle) deqp

(6)sqlserver2008 查看内存占用

select 
     type, sum(multi_pages_kb) as [KB]
 from 
     sys.dm_os_memory_clerks 
 where 
     multi_pages_kb != 0 
 group by type
 order by 2 desc

(7)sqlserver2008表描述

SELECT
        表名=case   when   a.colorder=1   then   d.name   else   ‘‘   end,
        表说明=case   when   a.colorder=1   then   isnull(f.value,‘‘)   else   ‘‘   end,
        字段序号=a.colorder,
        字段名=a.name,
        标识=case   when   COLUMNPROPERTY(   a.id,a.name,‘IsIdentity‘)=1   then   ‘√‘else   ‘‘   end,
        主键=case   when   exists(SELECT   1   FROM   sysobjects   where   xtype=‘PK‘   and   name   in   (
        SELECT   name   FROM   sysindexes   WHERE   indid   in(
        SELECT   indid   FROM   sysindexkeys   WHERE   id   =   a.id   AND   colid=a.colid
        )))   then   ‘√‘   else   ‘‘   end,
        类型=b.name,
        占用字节数=a.length,
        长度=COLUMNPROPERTY(a.id,a.name,‘PRECISION‘),
        小数位数=isnull(COLUMNPROPERTY(a.id,a.name,‘Scale‘),0),
        允许空=case   when   a.isnullable=1   then   ‘√‘else   ‘‘   end,
        默认值=isnull(e.text,‘‘),
        字段说明=isnull(g.[value],‘‘)
        FROM   syscolumns   a
        left   join   systypes   b   on   a.xusertype=b.xusertype
        inner   join   sysobjects   d   on   a.id=d.id     and   d.xtype=‘U‘   and     d.name<>‘dtproperties‘
        left   join   syscomments   e   on   a.cdefault=e.id
        left   join   sys.extended_properties   g   on   a.id=g.major_id   and   a.colid=g.minor_id
        left   join   sys.extended_properties   f   on   d.id=f.major_id   and   f.minor_id=0
        --where   d.name=‘orders‘         --如果只查询指定表,加上此条件
        order   by   a.id,a.colorder

(8)sqlserver查看阻塞

SELECT
  blocked_query.session_id AS blocked_session_id,
  blocking_query.session_id AS blocking_session_id,
 blocking_sql_text.text AS blocking_sql_text,
 blocked_sql_text.text AS blocked_sql_text,
  waits.wait_type AS blocking_resource,
blocked_query.command AS blocked_command,
  blocking_query.command AS blocking_command,  
 blocked_query.wait_type AS blocked_wait_type,
blocked_query.wait_time AS blocked_wait_time,  
blocking_query.total_elapsed_time AS blocking_elapsed_time,
  GETDATE()
FROM sys.dm_exec_requests blocked_query
  JOIN sys.dm_exec_requests blocking_query ON
blocked_query.blocking_session_id = blocking_query.session_id
CROSS APPLY
(
SELECT *
FROM sys.dm_exec_sql_text(blocking_query.sql_handle)
) blocking_sql_text
CROSS APPLY
(
SELECT *
FROM sys.dm_exec_sql_text(blocked_query.sql_handle)
) blocked_sql_text JOIN sys.dm_os_waiting_tasks waits ON
waits.session_id = blocking_query.session_id

(9)sqlserver查看作业状态

SELECT  [sJOB].[job_id] AS [作业ID] ,  
       [sJOB].[name] AS [作业名] ,  
        CASE WHEN [sJOBH].[run_date] IS NULL  
                  OR [sJOBH].[run_time] IS NULL THEN NULL  
            ELSE CAST(CAST([sJOBH].[run_date] AS CHAR(8)) + ‘ ‘  
                  + STUFF(STUFF(RIGHT(‘000000‘  
                                      + CAST([sJOBH].[run_time] AS VARCHAR(6)),  
                                      6), 3, 0, ‘:‘), 6, 0, ‘:‘) AS DATETIME)  
        END AS [最近执行时间] ,  
        CASE [sJOBH].[run_status]  
          WHEN 0 THEN ‘失败‘  
          WHEN 1 THEN ‘成功‘  
         WHEN 2 THEN ‘重试‘  
          WHEN 3 THEN ‘取消‘  
          WHEN 4 THEN ‘正在运行‘ -- In Progress  
        END AS [最近执行状态] ,  
        STUFF(STUFF(RIGHT(‘000000‘  
                          + CAST([sJOBH].[run_duration] AS VARCHAR(6)), 6), 3,  
                    0, ‘:‘), 6, 0, ‘:‘) AS [LastRunDuration (HH:MM:SS)] ,  
        [sJOBH].[message] AS [最近运行状态信息] ,  
        CASE [sJOBSCH].[NextRunDate]  
          WHEN 0 THEN NULL  
         ELSE CAST(CAST([sJOBSCH].[NextRunDate] AS CHAR(8)) + ‘ ‘  
               + STUFF(STUFF(RIGHT(‘000000‘  
                                   + CAST([sJOBSCH].[NextRunTime] AS VARCHAR(6)),  
                                   6), 3, 0, ‘:‘), 6, 0, ‘:‘) AS DATETIME)  
        END AS [下次运行时间]  
FROM    [msdb].[dbo].[sysjobs] AS [sJOB]  
        LEFT JOIN ( SELECT  [job_id] ,  
                            MIN([next_run_date]) AS [NextRunDate] ,  
                            MIN([next_run_time]) AS [NextRunTime]  
                    FROM    [msdb].[dbo].[sysjobschedules]  
                    GROUP BY [job_id]  
                  ) AS [sJOBSCH] ON [sJOB].[job_id] = [sJOBSCH].[job_id]  
        LEFT JOIN ( SELECT  [job_id] ,  
                            [run_date] ,  
                            [run_time] ,  
                           [run_status] ,  
                           [run_duration] ,  
                            [message] ,  
                           ROW_NUMBER() OVER ( PARTITION BY [job_id] ORDER BY [run_date] DESC, [run_time] DESC ) AS RowNumber  
                    FROM    [msdb].[dbo].[sysjobhistory]  
                   WHERE   [step_id] = 0  
                  ) AS [sJOBH] ON [sJOB].[job_id] = [sJOBH].[job_id]  
                                  AND [sJOBH].[RowNumber] = 1  
ORDER BY [作业名] 

(10)sqlserver紧急状态

EXEC sp_configure ‘allow updates‘, 1     --指定可以直接更新系统表 
go
reconfigure with override     --如果配置不需要重启服务，则配置值直接,改运行值
go                                           
use master
go
update sysdatabases set status = 32768    --该参数为置为紧急状态
where name = ‘AIS20051209164544‘
go
EXEC sp_configure ‘allow updates‘, 0
go
reconfigure with override



然后重建LDF


dbcc rebuild_log( ‘AIS20051209164544‘, ‘E:\K3data\mrp\AIS20051209164544_Log.LDF‘)



五、运行以下语句，就可以把数据库的状态还原：

update sysdatabases set status=28 where name=‘AIS20051209164544‘
EXEC sp_configure ‘allow updates‘,0
reconfigure with override
Go

(11)查出走全表扫描最频繁的TOP20表

----- 查出走全表扫描最频繁的TOP20表
select top 20 db_name(a.database_id) database_name,object_name(a.object_id) table_name,b.name index_name,a.user_seeks,a.user_scans,a.last_user_seek,a.last_user_scan from sys.dm_db_index_usage_stats a
inner join sys.indexes b
on a.object_id=b.object_id and a.index_id=b.index_id
order by user_scans desc

----查出缺失的索引的表和字段
SELECT mig.*, statement AS table_name,
    column_id, column_name, column_usage
FROM sys.dm_db_missing_index_details AS mid
CROSS APPLY sys.dm_db_missing_index_columns (mid.index_handle)
INNER JOIN sys.dm_db_missing_index_groups AS mig ON mig.index_handle = mid.index_handle
ORDER BY mig.index_group_handle, mig.index_handle, column_id;

(12)查看sql启动以来执行耗时top语句

SELECT  creation_time  N‘语句编译时间‘
         ,last_execution_time  N‘上次执行时间‘
         ,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‘
         , total_worker_time/1000 N‘所用的CPU总时间ms‘
         , total_elapsed_time/1000  N‘总花费时间ms‘
         , (total_elapsed_time / execution_count)/1000  N‘平均时间ms‘
         ,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‘
 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;

(13)查看磁盘情况1

USE master

GO

SET NOCOUNT ON

--===================public variables

declare

        @db_name        sysname

        ,@drive                sysname

;

select

        @db_name        = NULL        --NULL: all databases

        ,@drive                = ‘D‘        --NULL:all drives

;

--================end public variables


--===================private variables

declare

        @sql nvarchar(max)

        ,@exec_sql nvarchar(max)

        ,@database_name sysname

        ,@reservedpages int

;

select

        @sql = N‘

select @reservedpages = sum(a.total_pages)

from sys.partitions p WITH(NOLOCK)

        inner join sys.allocation_units a WITH(NOLOCK)

                on p.partition_id = a.container_id‘

        ,@database_name = N‘‘

        ,@exec_sql = N‘‘

        ,@reservedpages = 0

;

--================end private variables


--================for reserved pages saving

declare

        @tb_database_reservedpages table

(

        id int identity(1,1) not null PRIMARY key

        ,database_id int null

        ,database_name sysname null

        ,reservedpages int null

);


DECLARE

        @tb_dbSize TABLE

(

id int identity(1,1) not null PRIMARY key

,size int null

,name sysname null

,database_id int null

,type bit null 
,on_drive char(1) null

,f_name sysname null

);


--size = 8K

INSERT INTO @tb_dbSize

SELECT 
        F.size

        ,DB.name

        ,F.database_id

        ,F.type

        ,left(F.physical_name,1)

        ,F.name AS f_name

FROM sys.master_files AS F WITH (NOLOCK)

        INNER JOIN sys.databases AS DB WITH (NOLOCK)

        ON F.database_id = DB.database_id


--==============================================all database reservedpages generation

declare cur_database cursor local static forward_only read_only

for

select name

from sys.databases with(nolock)

--==============you can filter the system database or not

--where name not in(

--‘master‘

--,‘tempdb‘

--,‘model‘

--,‘msdb‘

--,‘distribution‘

--);


open cur_database

fetch next from cur_database into @database_name


while(@@FETCH_STATUS = 0)

begin

        SET 
                @exec_sql = N‘USE ‘ + QUOTENAME(@database_name) + ‘;‘

                + @sql;


        exec sys.sp_executesql @exec_sql

                                                        ,N‘@reservedpages int output‘

                                                        ,@reservedpages = @reservedpages output



        insert into @tb_database_reservedpages

        select db_id(@database_name),@database_name,@reservedpages;


        fetch next from cur_database into @database_name

end;


close cur_database

deallocate cur_database


--select * from @tb_database_reservedpages

--============================================end all database reservedpages generation


--====================all database size statistics

;WITH dbSize--type = 0

AS

(

SELECT 
        database_name = name,

        database_id,

        on_drive,

        fileSize = sum(size)--*8./1024.

FROM @tb_dbSize

WHERE type = 0

GROUP BY name,database_id,on_drive

)

,logSize--type = 1

AS

(

SELECT 
        database_name = name,

        database_id,

        on_drive,

        fileSize = sum(size)--*8./1024.

FROM @tb_dbSize

WHERE type = 1

GROUP BY name,database_id,on_drive

)

,Size

AS

(

        SELECT 
                database_name = name,

                database_id,

                dbSize = sum(size)--*8./1024.

        FROM @tb_dbSize

        GROUP BY name,database_id

)

SELECT 
                server_name = @@SERVERNAME

                ,A.database_name

                ,[dbSize(MB)] = S.dbSize * 8./1024.

                ,[dataSize(MB)] = A.fileSize * 8./1024.

                ,[unallocatedSize(MB)] = ltrim(str((case 
                                                                                                when A.fileSize/*@dbsize*/ >= rvp.reservedpages/*@reservedpages*/ then  

                                                                                                                                (convert (dec (15,2),A.fileSize/*@dbsize*/) - convert (dec (15,2),rvp.reservedpages/*@reservedpages*/))   

                                                                                                                                * 8192 / 1048576 
                                                                                                else 0 
                                                                                        end),15,2) + ‘ MB‘)

                ,data_Drive = A.on_drive

                ,[logSize(MB)] = B.fileSize * 8./1024.

                ,log_Drive = B.on_drive

FROM dbSize AS A

        INNER JOIN logSize AS B

        ON A.database_id = B.database_id

        INNER JOIN Size AS S

        ON A.database_id = S.database_id

        INNER JOIN @tb_database_reservedpages AS rvp

        ON A.database_id = rvp.database_id

WHERE A.database_name = ISNULL(@db_name,A.database_name)

        AND (A.on_drive = ISNULL(@drive,A.on_drive)

  OR B.on_drive= ISNULL(@drive,B.on_drive)

  )ORDER BY S.dbSize DESC         

--=================end all database size statistics


--====================instance summary

;WITH DATA

AS

(select 
        Size = cast(sum(size)*8./1024./1024. AS decimal(9,2))

        ,type

FROM @tb_dbSize

GROUP BY type

)


SELECT 
        server_name = @@SERVERNAME

        ,[0] + [1] AS [dbSize(GB)]

        ,[0] AS [dataSize(GB)]

        ,[1] AS [logSize(GB)] 
FROM (

                SELECT *

                FROM DATA

) AS A

PIVOT

(

        sum(size)

        FOR type in([0],[1])

) AS B


--=================end instance summary

(14)查看磁盘情况2

USE master

GO


declare

@drive sysname

;

select

@drive = NULL --null: all the drives

;


if OBJECT_ID(‘tempdb.dbo.#Disk‘,‘u‘) is not null

drop table #Disk


CREATE TABLE #Disk

( 
driver char(1) 
,freespace nvarchar(255) 
,totalspace nvarchar(255) 
,freeprecent nvarchar(5) 
) 
DECLARE @TotalDisk TABLE 
( 
t nvarchar(100) 
) 

DECLARE 
@driver nvarchar(5) 
,@totalsize nvarchar(50)

; 
INSERT INTO #Disk 
( 
driver 
,freespace 
) 
EXEC master.sys.xp_fixeddrives


--------============open xp_cmdshell

IF EXISTS (

SELECT TOP 1 *

FROM sys.configurations WITH (NOLOCK)

WHERE name=‘xp_cmdshell‘ and value=0)

BEGIN

EXEC master.dbo.sp_configure ‘show advanced options‘, 1 
RECONFIGURE WITH OVERRIDE 
EXEC master.dbo.sp_configure ‘xp_cmdshell‘, 1

RECONFIGURE WITH OVERRIDE 

END

--------============end open xp_cmdshell


DECLARE disk_cur CURSOR LOCAL STATIC FORWARD_ONLY READ_ONLY

FOR 
SELECT 
driver 
FROM #Disk


OPEN disk_cur 
FETCH NEXT FROM disk_cur INTO @driver 

WHILE @@FETCH_STATUS=0 
BEGIN 
INSERT INTO @TotalDisk 
EXEC(‘xp_cmdshell ‘‘wmic LogicalDisk WHERE "Caption=‘‘‘‘‘+@driver+‘:‘‘‘‘" GET FreeSpace ,SIZE /VALUE‘‘‘ ) 
SELECT 
@totalsize=t 
FROM @TotalDisk 
WHERE 
t LIKE ‘Size%‘ 

if(@totalsize is not null and LEN(@totalsize)>4) 
BEGIN 
SET @totalsize=REPLACE(SUBSTRING(@totalsize,CHARINDEX(‘=‘,@totalsize)+1,LEN(@totalsize)-CHARINDEX(‘=‘,@totalsize)-1),‘ ‘,‘‘) 
SET @totalsize=cast(cast(RTRIM(@totalsize) as bigint)/1024/1024 as nvarchar(50)) 

UPDATE #Disk 
SET totalspace=@totalsize 
,freeprecent=CAST(CAST(freespace AS bigint)*1.0/CAST(@totalsize AS bigint)*100 AS decimal(5,2)) 
WHERE 
driver=@driver 
END 

FETCH NEXT FROM disk_cur INTO @driver 
END 

close disk_cur 
deallocate disk_cur 

---==============query summary

SELECT 
GETDATE() datetime 
,driver 
,[freespace(GB)] = cast(freespace as decimal(10,2))/1024.

,[totalspace(GB)] = cast(totalspace as decimal(10,2))/1024.

,[freeprecent(%)]= freeprecent 
FROM #Disk 
WHERE driver = ISNULL(@drive,driver);


if OBJECT_ID(‘tempdb.dbo.#Disk‘,‘u‘) is not null

drop table #Disk

GO

(15)查看所有进程所执行的slq

CREATE TABLE #spids(   i    INT,   spid INT);
CREATE TABLE #dbcc(   i INT IDENTITY(1,1),
EventType  NVARCHAR(255),    
Parameters NVARCHAR(4000),   
 EventInfo  NVARCHAR(4000));
 DECLARE @spid INT, 
 @sql NVARCHAR(255);
 SET @sql = N‘DBCC INPUTBUFFER(@spid);‘;
 DECLARE c CURSOR   LOCAL STATIC FORWARD_ONLY READ_ONLY    FOR    
   -- substitute your own query to determine SPIDs to check: 
       SELECT session_id        FROM sys.dm_exec_sessions      
         WHERE is_user_process = 1;OPEN c;FETCH NEXT FROM c INTO 
         @spid;WHILE @@FETCH_STATUS = 0BEGIN   
         INSERT #dbcc(EventType, [Parameters], EventInfo)   
             EXEC sp_executesql @sql, N‘@spid INT‘, @spid;  
              INSERT #spids SELECT SCOPE_IDENTITY(), @spid;  
               FETCH NEXT FROM c INTO @spid;END
               CLOSE c;DEALLOCATE c;
               SELECT s.spid, d.EventInfo   FROM #spids AS s   
                INNER JOIN #dbcc AS d    ON s.i = d.i   ORDER BY s.spid;
                DROP TABLE #spids, #dbcc;

(16)查看索引碎片

SELECT schema_name(T.schema_id) AS Schema_Name,T.Name AS Table_Name,I.name AS Index_Name,
I.type AS Index_Type,D.avg_fragmentation_in_percent AS avg_fragmentation_in_percent 
FROM sys.dm_db_index_physical_stats(DB_id(‘zdlzydb‘),null, null, null, null) AS D
INNER JOIN sys.indexes AS I WITH(NOLOCK) ON D.index_id=I.index_id AND D.object_id=I.object_id
INNER JOIN sys.tables AS T WITH(NOLOCK) ON T.object_id=D.object_id
WHERE I.type>0 AND T.is_ms_shipped=0 AND D.avg_fragmentation_in_percent>=30
order by D.avg_fragmentation_in_percent desc

(17)查找连续7天登录

问如何查询出所有在某一段时间内（如：2012-1-1至2012-1-17)连续7天都有登录的用户。

SELECT uid   
  FROM(  
      SELECT count(login_time) as login_count, uid    
         FROM (SELECT date(login_time) login_time, uid FROM tmp_test  
                 WHERE login_time>=‘2012-01-01 00:00:00‘ AND 
                       login_time <‘2012-01-18 00:00:00‘ 
                  GROUP BY uid, date(login_time)  
                  ORDER BY uid, date(login_time)  
              ) x  
          GROUP BY uid  
     ) x   

  WHERE login_count=7;