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财富等待之SOS_SCHEDULETiguan_YIELD,也不知是哪位壮

来源:http://www.dfwstonefabricators.com 作者:数据库 人气:152 发布时间:2019-11-04
摘要: 一.概念   SOS_SCHEDULER_YIELD等待类型是三个任务自愿放弃当前的财富占用,让给其余职责接受。  这些等待类型与CPU有向来关联,与内存与也许有直接关联,与CPU有关联是因为在sqlse

 一.概念

   SOS_SCHEDULER_YIELD等待类型是三个任务自愿放弃当前的财富占用,让给其余职责接受。   这些等待类型与CPU有向来关联,与内存与也许有直接关联,与CPU有关联是因为在sql server里是由此任务调节SCHEDULE本田UR-V来涉及CPU。 通过SCHEDULEEnclave下的Worker线程来管理SQL职分。为何跟内享有关系吧,是因为获取的财富需求内部存款和储蓄器来承载。 
  Yelding的发出:是指SCHEDULE凯雷德上运转的Worker都是非抢占式的, 在 SCHEDULELX570上Worker由于财富等待,让出当前Worker给别的Worker就叫Yielding。 关于SCHEDULELX570_YIELD爆发的原理查看  sqlserver 职分调解与CPU。SOS_SCHEDULER_YIELD 等待的情状可以掌握到:

  (1)CPU有压力

  (2) SQL Server CPU scheduler 使用合适处理就能够功用高。

1.1 从实例等第来查阅等待数

select wait_type,
waiting_tasks_count,
wait_time_ms ,
max_wait_time_ms,
signal_wait_time_ms
from sys.dm_os_wait_stats
where wait_type like 'SOS_SCHEDULER_YIELD%' 
order by wait_type

  查询如下图所示: 

图片 1

  这么些等待类型排名第二,从呼吁的次数来讲有693670五十八回,也正是说该线程用完了4ms的日子片,主动放任cpu。假定未有大气的runnable队列或然大量的signal wait,表明不确定是cpu难点。因为这三个目标是cpu压力的一个人展览馆示。供给检查施行布置中是还是不是存在大量围观操作。

1.2 通过dmv scheaduler的描述查看cpu压力

SELECT scheduler_id, current_tasks_count, runnable_tasks_count, work_queue_count, pending_disk_io_count
FROM sys.dm_os_schedulers
WHERE scheduler_id < 255

  如下图所示:

图片 2

  若是您放在心上到runnable_tasks_count计数有两位数,持续相当长日子(意气风发段时间内卡塔 尔(英语:State of Qatar),你就能够精通CPU压力。两位数字平时被以为是一件坏事 不能应对方今负荷。此外能够由此质量监视器%Processor 提姆e 来查阅CPU的光景。

1.3 通过案例实时查看sql语句级的能源等待

SELECT * FROM sys.dm_exec_requests  WHERE wait_type LIKE 'SOS_SCHEDULER_YIELD%'

  -- 或研究能源等待的
  SELECT session_id ,status ,blocking_session_id
  ,wait_type ,wait_time ,wait_resource
  ,transaction_id
  FROM sys.dm_exec_requests
  WHERE status = N'suspended';

  如下图所示 运营sys.dm_exec_requests 表,由于字段多截取了三断。会话202的sql 语句上一次等待类型是SOS_SCHEDULER_YIELD。之所以会并发YIELD,是因为SCHEDULECR-V下的Worker已经发起了task 命令,但由于财富等待 如锁恐怕磁盘输入/输出等,Worker又是非抢占式,所以让出了脚下的Worker。

图片 3

图片 4

图片 5

1.4 减少sos_scheduler_yield 等待

  正如下面所斟酌的,这种等待类型与CPU压力有关。扩展更加多CPU是轻松的应用方案,可是达成那些解决方案并不轻巧。当那一个等待类型异常高时,你能够考虑任何的事务。这里通过从缓存中找到与CPU相关的最昂贵的SQL语句。

--查询编写翻译以来 cpu耗费时间总的数量最多的前50条(Total_woker_time) 第风度翩翩种查询
select
'total_worker_time(ms)'=(total_worker_time/1000),
q.[text], --DB_NAME(dbid),OBJECT_NAME(objectid),
execution_count,
'max_worker_time(ms)'=(max_worker_time/1000),
'last_worker_time(ms)'=(last_worker_time/1000),
'min_worker_time(ms)'=(min_worker_time/1000),
'max_elapsed_time(ms)'=(max_elapsed_time/1000),
'min_elapsed_time(ms)'=(min_elapsed_time/1000),
'last_elapsed_time(ms)'=(last_elapsed_time/1000),
total_physical_reads,
last_physical_reads,
min_physical_reads,
max_physical_reads,
total_logical_reads,
last_logical_reads,
max_logical_reads,
creation_time,
last_execution_time
from
(select top 50 qs.* 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(highest_cpu_queries.plan_handle) as q
order by highest_cpu_queries.total_worker_time DESC

 

试应用环境:SQL2008 R2、SQL2012、SQL2014

[sql] view plaincopy
--语句1:获取前20逻辑读取次数或逻辑写入次数或CPU 时间  
SELECT TOP 20 SUBSTRING(qt.TEXT, (qs.statement_start_offset/2)+1,  
((CASE qs.statement_end_offset  
WHEN -1 THEN DATALENGTH(qt.TEXT)  
ELSE qs.statement_end_offset  
END - qs.statement_start_offset)/2)+1),  
qs.execution_count,  
qs.total_logical_reads, qs.last_logical_reads,  
qs.total_logical_writes, qs.last_logical_writes,  
qs.total_worker_time,  
qs.last_worker_time,  
qs.total_elapsed_time/1000000 total_elapsed_time_in_S,  
qs.last_elapsed_time/1000000 last_elapsed_time_in_S,  
qs.last_execution_time,  
qp.query_plan  
FROM sys.dm_exec_query_stats qs  
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) qt  
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp  
ORDER BY qs.total_logical_reads DESC -- 逻辑读取次数  
 --ORDER BY qs.total_logical_writes DESC -- 逻辑写入次数  
 --ORDER BY qs.total_worker_time DESC -- CPU 时间  


--语句2:获取前20执行的 SP 命令的总工作时间 (CPU 压力)  
    SELECT TOP 20 qt.text AS 'SP Name', qs.total_worker_time AS 'TotalWorkerTime',   
    qs.total_worker_time/qs.execution_count AS 'AvgWorkerTime',  
    qs.execution_count AS 'Execution Count',   
    ISNULL(qs.execution_count/DATEDIFF(Second, qs.creation_time, GetDate()), 0) AS 'Calls/Second',  
    ISNULL(qs.total_elapsed_time/qs.execution_count, 0) AS 'AvgElapsedTime',   
    qs.max_logical_reads, qs.max_logical_writes,   
    DATEDIFF(Minute, qs.creation_time, GetDate()) AS 'Age in Cache'  
    FROM sys.dm_exec_query_stats AS qs  
    CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt  
    WHERE qt.dbid = db_id() -- 当前数据库  
    ORDER BY qs.total_worker_time DESC  

--语句3: 获取前20 执行的 SP 命令逻辑写入/分钟  
    SELECT TOP 20 qt.text AS 'SP Name', qs.total_logical_writes, qs.total_logical_writes/qs.execution_count AS 'AvgLogicalWrites',  
    qs.total_logical_writes/DATEDIFF(Minute, qs.creation_time, GetDate()) AS 'Logical Writes/Min',    
    qs.execution_count AS 'Execution Count',   
    qs.execution_count/DATEDIFF(Second, qs.creation_time, GetDate()) AS 'Calls/Second',   
    qs.total_worker_time/qs.execution_count AS 'AvgWorkerTime',  
    qs.total_worker_time AS 'TotalWorkerTime',  
    qs.total_elapsed_time/qs.execution_count AS 'AvgElapsedTime',  
    qs.max_logical_reads, qs.max_logical_writes, qs.total_physical_reads,   
    DATEDIFF(Minute, qs.creation_time, GetDate()) AS 'Age in Cache',  
    qs.total_physical_reads/qs.execution_count AS 'Avg Physical Reads', qt.dbid  
    FROM sys.dm_exec_query_stats AS qs  
    CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt  
    WHERE qt.dbid = db_id() -- 当前数据库  
    ORDER BY qs.total_logical_writes DESC  

--语句4: 获取前20执行的 SP 命令的逻辑读取(内存压力)   
    SELECT TOP 20 qt.text AS 'SP Name', total_logical_reads,   
    qs.execution_count AS 'Execution Count', total_logical_reads/qs.execution_count AS 'AvgLogicalReads',  
    qs.execution_count/DATEDIFF(Second, qs.creation_time, GetDate()) AS 'Calls/Second',   
    qs.total_worker_time/qs.execution_count AS 'AvgWorkerTime',  
    qs.total_worker_time AS 'TotalWorkerTime',  
    qs.total_elapsed_time/qs.execution_count AS 'AvgElapsedTime',  
    qs.total_logical_writes,  
    qs.max_logical_reads, qs.max_logical_writes, qs.total_physical_reads,   
    DATEDIFF(Minute, qs.creation_time, GetDate()) AS 'Age in Cache', qt.dbid   
    FROM sys.dm_exec_query_stats AS qs  
    CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt  
    WHERE qt.dbid = db_id() -- 当前数据库  
    ORDER BY total_logical_reads DESC  

--语句5: 获取前20执行的 SP 命令由物理读取 (读取 I/O 压力)  
    SELECT TOP 20 qt.text AS 'SP Name', qs.total_physical_reads, qs.total_physical_reads/qs.execution_count AS 'Avg Physical Reads',  
    qs.execution_count AS 'Execution Count',  
    qs.execution_count/DATEDIFF(Second, qs.creation_time, GetDate()) AS 'Calls/Second',    
    qs.total_worker_time/qs.execution_count AS 'AvgWorkerTime',  
    qs.total_worker_time AS 'TotalWorkerTime',  
    qs.total_elapsed_time/qs.execution_count AS 'AvgElapsedTime',  
    qs.max_logical_reads, qs.max_logical_writes,    
    DATEDIFF(Minute, qs.creation_time, GetDate()) AS 'Age in Cache', qt.dbid   
    FROM sys.dm_exec_query_stats AS qs  
    CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt  
    WHERE qt.dbid = db_id() -- 当前数据库  
    ORDER BY qs.total_physical_reads DESC  

--语句6: 获取前20执行的 SP 命令执行计数  
    SELECT TOP 20 qt.text AS 'SP Name', qs.execution_count AS 'Execution Count',    
    qs.execution_count/DATEDIFF(Second, qs.creation_time, GetDate()) AS 'Calls/Second',  
    qs.total_worker_time/qs.execution_count AS 'AvgWorkerTime',  
    qs.total_worker_time AS 'TotalWorkerTime',  
    qs.total_elapsed_time/qs.execution_count AS 'AvgElapsedTime',  
    qs.max_logical_reads, qs.max_logical_writes, qs.total_physical_reads,   
    DATEDIFF(Minute, qs.creation_time, GetDate()) AS 'Age in Cache'  
    FROM sys.dm_exec_query_stats AS qs  
    CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt  
    WHERE qt.dbid = db_id() -- Filter by current database  
    ORDER BY qs.execution_count DESC  

查看10秒时间内存储过程执行次数和CPU时间
[sql] view plaincopy在CODE上查看代码片派生到我的代码片
SELECT DB_NAME(st.dbid) DBName  
      ,OBJECT_SCHEMA_NAME(st.objectid,dbid) SchemaName  
      ,OBJECT_NAME(st.objectid,dbid) StoredProcedure  
      ,max(cp.usecounts) Execution_count  
      ,sum(qs.total_worker_time) total_cpu_time  
      ,sum(qs.total_worker_time) / (max(cp.usecounts) * 1.0)  avg_cpu_time  
 into #temp  
 FROM sys.dm_exec_cached_plans cp join sys.dm_exec_query_stats qs on cp.plan_handle = qs.plan_handle  
      CROSS APPLY sys.dm_exec_sql_text(cp.plan_handle) st  
 where DB_NAME(st.dbid) is not null and cp.objtype = 'proc'  
 group by DB_NAME(st.dbid),OBJECT_SCHEMA_NAME(objectid,st.dbid), OBJECT_NAME(objectid,st.dbid)   
 order by sum(qs.total_worker_time) desc  

WAITFOR DELAY '00:00:10'   

SELECT DB_NAME(st.dbid) DBName  
      ,OBJECT_SCHEMA_NAME(st.objectid,dbid) SchemaName  
      ,OBJECT_NAME(st.objectid,dbid) StoredProcedure  
      ,max(cp.usecounts) Execution_count  
      ,sum(qs.total_worker_time) total_cpu_time  
      ,sum(qs.total_worker_time) / (max(cp.usecounts) * 1.0)  avg_cpu_time  
 into #temp2  
 FROM sys.dm_exec_cached_plans cp join sys.dm_exec_query_stats qs on cp.plan_handle = qs.plan_handle  
      CROSS APPLY sys.dm_exec_sql_text(cp.plan_handle) st  
 where DB_NAME(st.dbid) is not null and cp.objtype = 'proc'  
 group by DB_NAME(st.dbid),OBJECT_SCHEMA_NAME(objectid,st.dbid), OBJECT_NAME(objectid,st.dbid)   
 order by sum(qs.total_worker_time) desc  

SELECT a.DBNAMe, a.SchemaName, a.StoredProcedure,  
b.Execution_count - a.Execution_count as ExecCnt,  
b.total_cpu_time - a.total_cpu_time as CPU   
FROM #temp a inner join #temp2 b on a.DBName = b.DBname and a.SchemaName = b.SchemaName and a.StoredProcedure = b.StoredProcedure  
ORDER BY 5 desc  

drop table #temp  
drop table #temp2   

  

试应用情形:SQL2009 PAJERO2、SQL二〇一二、SQL二〇一五

[sql] view plaincopy

  1. --语句1:获取前20逻辑读取次数或逻辑写入次数或CPU 时间  
  2. SELECT TOP 20 SUBSTRING(qt.TEXT, (qs.statement_start_offset/2)+1,  
  3. ((CASE qs.statement_end_offset  
  4. WHEN -1 THEN DATALENGTH(qt.TEXT)  
  5. ELSE qs.statement_end_offset  
  6. END - qs.statement_start_offset)/2)+1),  
  7. qs.execution_count,  
  8. qs.total_logical_reads, qs.last_logical_reads,  
  9. qs.total_logical_writes, qs.last_logical_writes,  
  10. qs.total_worker_time,  
  11. qs.last_worker_time,  
  12. qs.total_elapsed_time/1000000 total_elapsed_time_in_S,  
  13. qs.last_elapsed_time/1000000 last_elapsed_time_in_S,  
  14. qs.last_execution_time,  
  15. qp.query_plan  
  16. FROM sys.dm_exec_query_stats qs  
  17. CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) qt  
  18. CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp  
  19. ORDER BY qs.total_logical_reads DESC -- 逻辑读取次数  
  20.  --ORDER BY qs.total_logical_writes DESC -- 逻辑写入次数  
  21.  --ORDER BY qs.total_worker_time DESC -- CPU 时间  
  22.   
  23.   
  24. --语句2:获取前20实行的 SP 命令的总工程师时 (CPU 压力卡塔 尔(英语:State of Qatar)  
  25.     SELECT TOP 20 qt.text AS 'SP Name', qs.total_worker_time AS 'TotalWorkerTime',   
  26.     qs.total_worker_time/qs.execution_count AS 'AvgWorkerTime',  
  27.     qs.execution_count AS 'Execution Count',   
  28.     ISNULL(qs.execution_count/DATEDIFF(Second, qs.creation_time, GetDate()), 0) AS 'Calls/Second',  
  29.     ISNULL(qs.total_elapsed_time/qs.execution_count, 0) AS 'AvgElapsedTime',   
  30.     qs.max_logical_reads, qs.max_logical_writes,   
  31.     DATEDIFF(Minute, qs.creation_time, GetDate()) AS 'Age in Cache'  
  32.     FROM sys.dm_exec_query_stats AS qs  
  33.     CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt  
  34.     WHERE qt.dbid = db_id() -- 当前数据库  
  35.     ORDER BY qs.total_worker_time DESC  
  36.   
  37. --语句3: 获取前20 实施的 SP 命令逻辑写入/分钟  
  38.     SELECT TOP 20 qt.text AS 'SP Name', qs.total_logical_writes, qs.total_logical_writes/qs.execution_count AS 'AvgLogicalWrites',  
  39.     qs.total_logical_writes/DATEDIFF(Minute, qs.creation_time, GetDate()) AS 'Logical Writes/Min',    
  40.     qs.execution_count AS 'Execution Count',   
  41.     qs.execution_count/DATEDIFF(Second, qs.creation_time, GetDate()) AS 'Calls/Second',   
  42.     qs.total_worker_time/qs.execution_count AS 'AvgWorkerTime',  
  43.     qs.total_worker_time AS 'TotalWorkerTime',  
  44.     qs.total_elapsed_time/qs.execution_count AS 'AvgElapsedTime',  
  45.     qs.max_logical_reads, qs.max_logical_writes, qs.total_physical_reads,   
  46.     DATEDIFF(Minute, qs.creation_time, GetDate()) AS 'Age in Cache',  
  47.     qs.total_physical_reads/qs.execution_count AS 'Avg Physical Reads', qt.dbid  
  48.     FROM sys.dm_exec_query_stats AS qs  
  49.     CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt  
  50.     WHERE qt.dbid = db_id() -- 当前数据库  
  51.     ORDER BY qs.total_logical_writes DESC  
  52.   
  53. --语句4: 获取前20实行的 SP 命令的逻辑读取(内部存款和储蓄器压力卡塔尔   
  54.     SELECT TOP 20 qt.text AS 'SP Name', total_logical_reads,   
  55.     qs.execution_count AS 'Execution Count', total_logical_reads/qs.execution_count AS 'AvgLogicalReads',  
  56.     qs.execution_count/DATEDIFF(Second, qs.creation_time, GetDate()) AS 'Calls/Second',   
  57.     qs.total_worker_time/qs.execution_count AS 'AvgWorkerTime',  
  58.     qs.total_worker_time AS 'TotalWorkerTime',  
  59.     qs.total_elapsed_time/qs.execution_count AS 'AvgElapsedTime',  
  60.     qs.total_logical_writes,  
  61.     qs.max_logical_reads, qs.max_logical_writes, qs.total_physical_reads,   
  62.     DATEDIFF(Minute, qs.creation_time, GetDate()) AS 'Age in Cache', qt.dbid   
  63.     FROM sys.dm_exec_query_stats AS qs  
  64.     CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt  
  65.     WHERE qt.dbid = db_id() -- 当前数据库  
  66.     ORDER BY total_logical_reads DESC  
  67.   
  68. --语句5: 获取前20执行的 SP 命令由物理读取 (读取 I/O 压力卡塔 尔(英语:State of Qatar)  
  69.     SELECT TOP 20 qt.text AS 'SP Name', qs.total_physical_reads, qs.total_physical_reads/qs.execution_count AS 'Avg Physical Reads',  
  70.     qs.execution_count AS 'Execution Count',  
  71.     qs.execution_count/DATEDIFF(Second, qs.creation_time, GetDate()) AS 'Calls/Second',    
  72.     qs.total_worker_time/qs.execution_count AS 'AvgWorkerTime',  
  73.     qs.total_worker_time AS 'TotalWorkerTime',  
  74.     qs.total_elapsed_time/qs.execution_count AS 'AvgElapsedTime',  
  75.     qs.max_logical_reads, qs.max_logical_writes,    
  76.     DATEDIFF(Minute, qs.creation_time, GetDate()) AS 'Age in Cache', qt.dbid   
  77.     FROM sys.dm_exec_query_stats AS qs  
  78.     CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt  
  79.     WHERE qt.dbid = db_id() -- 当前数据库  
  80.     ORDER BY qs.total_physical_reads DESC  
  81.   
  82. --语句6: 获取前20试行的 SP 命令实践计数  
  83.     SELECT TOP 20 qt.text AS 'SP Name', qs.execution_count AS 'Execution Count',    
  84.     qs.execution_count/DATEDIFF(Second, qs.creation_time, GetDate()) AS 'Calls/Second',  
  85.     qs.total_worker_time/qs.execution_count AS 'AvgWorkerTime',  
  86.     qs.total_worker_time AS 'TotalWorkerTime',  
  87.     qs.total_elapsed_time/qs.execution_count AS 'AvgElapsedTime',  
  88.     qs.max_logical_reads, qs.max_logical_writes, qs.total_physical_reads,   
  89.     DATEDIFF(Minute, qs.creation_time, GetDate()) AS 'Age in Cache'  
  90.     FROM sys.dm_exec_query_stats AS qs  
  91.     CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) AS qt  
  92.     WHERE qt.dbid = db_id() -- Filter by current database  
  93.     ORDER BY qs.execution_count DESC  

 

翻开10秒时间内囤积进度实行次数和CPU时间

[sql] view plaincopy图片 6图片 7

  1. SELECT DB_NAME(st.dbid) DBName  
  2.       ,OBJECT_SCHEMA_NAME(st.objectid,dbid) SchemaName  
  3.       ,OBJECT_NAME(st.objectid,dbid) StoredProcedure  
  4.       ,max(cp.usecounts) Execution_count  
  5.       ,sum(qs.total_worker_time) total_cpu_time  
  6.       ,sum(qs.total_worker_time) / (max(cp.usecounts) * 1.0)  avg_cpu_time  
  7.  into #temp  
  8.  FROM sys.dm_exec_cached_plans cp join sys.dm_exec_query_stats qs on cp.plan_handle = qs.plan_handle  
  9.       CROSS APPLY sys.dm_exec_sql_text(cp.plan_handle) st  
  10.  where DB_NAME(st.dbid) is not null and cp.objtype = 'proc'  
  11.  group by DB_NAME(st.dbid),OBJECT_SCHEMA_NAME(objectid,st.dbid), OBJECT_NAME(objectid,st.dbid)   
  12.  order by sum(qs.total_worker_time) desc  
  13.   
  14. WAITFOR DELAY '00:00:10'   
  15.   
  16. SELECT DB_NAME(st.dbid) DBName  
  17.       ,OBJECT_SCHEMA_NAME(st.objectid,dbid) SchemaName  
  18.       ,OBJECT_NAME(st.objectid,dbid) StoredProcedure  
  19.       ,max(cp.usecounts) Execution_count  
  20.       ,sum(qs.total_worker_time) total_cpu_time  
  21.       ,sum(qs.total_worker_time) / (max(cp.usecounts) * 1.0)  avg_cpu_time  
  22.  into #temp2  
  23.  FROM sys.dm_exec_cached_plans cp join sys.dm_exec_query_stats qs on cp.plan_handle = qs.plan_handle  
  24.       CROSS APPLY sys.dm_exec_sql_text(cp.plan_handle) st  
  25.  where DB_NAME(st.dbid) is not null and cp.objtype = 'proc'  
  26.  group by DB_NAME(st.dbid),OBJECT_SCHEMA_NAME(objectid,st.dbid), OBJECT_NAME(objectid,st.dbid)   
  27.  order by sum(qs.total_worker_time) desc  
  28.   
  29. SELECT a.DBNAMe, a.SchemaName, a.StoredProcedure,  
  30. b.Execution_count - a.Execution_count as ExecCnt,  
  31. b.total_cpu_time - a.total_cpu_time as CPU   
  32. FROM #temp a inner join #temp2 b on a.DBName = b.DBname and a.SchemaName = b.SchemaName and a.StoredProcedure = b.StoredProcedure  
  33. ORDER BY 5 desc  
  34.   
  35. drop table #temp  
  36. drop table #temp2   

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