SQL优化语句、sqlserver会话进程阻塞：FETCH API_CURSOR00000xx语句是什么？
jhchina1、查询当前阻塞语句
SQL
SELECT TOP 500
ds.host_name ,
ds.program_name ,
der.[session_id] ,
[request_id] ,
der.[cpu_time] ,
[start_time] AS '开始时间' ,
der.[status] AS '状态' ,
[command] AS '命令' ,
CASE WHEN statement_end_offset = -1 THEN text
ELSE SUBSTRING(text, statement_start_offset / 2 + 1,
( statement_end_offset - statement_start_offset )
/ 2)
END AS query_text ,
dest.[text] AS 'sql语句' ,
dest.objectid ,
DB_NAME([database_id]) AS '数据库名' ,
[blocking_session_id] AS '正在阻塞其他会话的会话ID' ,
der.[wait_type] AS '等待资源类型' ,
[wait_time] AS '等待时间' ,
[wait_resource] AS '等待的资源' ,
der.[reads] AS '物理读次数' ,
der.[writes] AS '写次数' ,
der.[logical_reads] AS '逻辑读次数' ,
der.[row_count] AS '返回结果行数' ,
percent_complete
FROM sys.[dm_exec_requests] AS der
INNER JOIN sys.dm_exec_sessions ds ON der.session_id = ds.session_id
CROSS APPLY sys.[dm_exec_sql_text](der.[sql_handle]) AS dest
CROSS APPLY sys.dm_exec_query_plan(der.plan_handle) qp
WHERE --[session_id]>50 and
der.session_id <> @@SPID
ORDER BY der.[cpu_time] DESC;2、当前进程及其语句：
SQL
SELECT PRO.loginame AS LoginName ,
DB.name AS DatabaseName ,
PRO.[status] AS ProcessStatus ,
PRO.cmd AS Command ,
PRO.last_batch AS LastBatch ,
PRO.cpu AS Cpu ,
PRO.physical_io AS PhysicalIo ,
SES.row_count AS [RowCount] ,
STM.[text] AS SQLStatement
FROM sys.sysprocesses AS PRO
INNER JOIN sys.databases AS DB ON PRO.dbid = DB.dbid
INNER JOIN sys.dm_exec_sessions AS SES ON PRO.spid = SES.session_id
CROSS APPLY sys.dm_exec_sql_text(PRO.sql_handle) AS STM
WHERE PRO.spid >= 50 -- Exclude system processes
ORDER BY PRO.physical_io DESC ,
PRO.cpu DESC;3、查看数据库中表的语句消耗
SQL
SELECT TOP 10
s2.dbid ,
DB_NAME(s2.dbid) AS [数据库名] ,
--s1.sql_handle ,
( SELECT TOP 1
SUBSTRING(s2.text, statement_start_offset / 2 + 1,
( ( CASE WHEN statement_end_offset = -1
THEN ( LEN(CONVERT(NVARCHAR(MAX), s2.text))
* 2 )
ELSE statement_end_offset
END ) - statement_start_offset ) / 2 + 1)
) AS [语句] ,
execution_count AS [执行次数] ,
last_execution_time AS [上次开始执行计划的时间] ,
total_worker_time AS [自编译以来执行所用的 CPU 时间总量（微秒）] ,
last_worker_time AS [上次执行计划所用的 CPU 时间（微秒）] ,
min_worker_time AS [单次执行期间曾占用的最小 CPU 时间（微秒）] ,
max_worker_time AS [单次执行期间曾占用的最大 CPU 时间（微秒）] ,
total_logical_reads AS [总逻辑读] ,
last_logical_reads AS [上次逻辑读] ,
min_logical_reads AS [最少逻辑读] ,
max_logical_reads AS [最大逻辑读] ,
total_logical_writes AS [总逻辑写] ,
last_logical_writes AS [上次逻辑写] ,
min_logical_writes AS [最小逻辑写] ,
max_logical_writes AS [最大逻辑写]
FROM sys.dm_exec_query_stats AS s1
CROSS APPLY sys.dm_exec_sql_text(sql_handle) AS s2
WHERE s2.objectid IS NULL
ORDER BY last_worker_time DESC;4、查看存储过程执行的语句开销大
SQL
SELECT TOP 20
DB_NAME(ISNULL(EPS.database_id, '')) [数据库名称] ,
OBJECT_NAME(EPS.object_id, EPS.database_id) [存储过程名称] --AS ObjectName
,
EPS.cached_time [添加到缓存的时间]--AS CachedTime
,
EPS.last_elapsed_time '最近执行所耗费时间（微秒）'--AS LastElapsedTime
,
EPS.last_worker_time '上次执行存储过程所用的CPU时间(微秒)' ,
EPS.execution_count [上次编译以来所执行的次数]--AS ExecutionCount
,
EPS.total_worker_time / EPS.execution_count [平均每次执行所用的CPU时间总量(微秒)]--AS AvgWorkerTime
,
EPS.total_elapsed_time / EPS.execution_count [平均每次执行所用的时间(微秒)]--AS AvgElapsedTime
,
( EPS.total_logical_reads + EPS.total_logical_writes )
/ EPS.execution_count AS AvgLogicalIO ,
b.text [存储过程内容]
FROM sys.dm_exec_procedure_stats AS EPS
CROSS APPLY sys.dm_exec_sql_text(EPS.sql_handle) b
ORDER BY EPS.last_elapsed_time DESC;5、开销较大的查询：
SQL
SELECT ss.SUM_Execution_count ,
t.text ,
ss.SUM_total_elapsed_time ,
ss.SUM_total_worker_time ,
ss.SUM_total_logical_reads ,
ss.SUM_total_logical_writes
FROM ( SELECT s.plan_handle ,
SUM(s.execution_count) SUM_Execution_count ,
SUM(s.total_elapsed_time) SUM_total_elapsed_time ,
SUM(s.total_worker_time) SUM_total_worker_time ,
SUM(s.total_logical_reads) SUM_total_logical_reads ,
SUM(s.total_logical_writes) SUM_total_logical_writes
FROM sys.dm_exec_query_stats s
GROUP BY s.plan_handle
) AS ss
CROSS APPLY sys.dm_exec_sql_text(ss.plan_handle) t
ORDER BY SUM_total_logical_reads DESC;查看SQLServer最耗资源时间的SQL语句
SQL
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;sqlserver会话显示在执行的FETCH API_CURSOR00000xx语句是什么？
通过常用的两种方式，都没有看到原始SQL脚本
SQL
select t.spid, t.kpid, t.blocked, t.status, t.lastwaittype, t.waitresource, t.waittime, t.open_tran
, DB_NAME(t.dbid) DbName, t.last_batch, t.loginame, t.program_name, t.hostname, t.hostprocess
, t.cmd, t.stmt_start, t.stmt_end, t.request_id, dc.text
from master.sys.sysprocesses t
outer apply master.sys.dm_exec_sql_text(t.sql_handle) dc
where t.spid = 53SQL
SELECT t.text
FROM sys.dm_exec_connections c
CROSS APPLY sys.dm_exec_sql_text (c.most_recent_sql_handle) t
WHERE session_id = 53通过DBCC INPUTBUFFER(spid)，返回结果也是：FETCH API_CURSOR00000xx
那么还有没有其他的视图来帮助我们呢？我们可以使用sys.dm_exec_cursors视图，将spid代入进去
SQL
SELECT c.session_id, c.properties, c.creation_time, c.is_open, t.text
FROM sys.dm_exec_cursors(53) c
CROSS APPLY sys.dm_exec_sql_text (c.sql_handle) t文章最后编辑时间：2023-10-02 08:25:37
