SP 在强大的服务器上很慢，但在本地很快（都来自 SSMS）
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【中文标题】SP 在强大的服务器上很慢，但在本地很快（都来自 SSMS）【英文标题】：SP slow on powerful server, but quick locally (both from SSMS) 【发布时间】：2012-09-19 10:07:19 【问题描述】：我继承了一个大而慢的存储过程，它让我做噩梦：
我的桌面上安装了 SQL Server 2008，并带有生产数据库的副本。我正在运行 SSMS 中的所有内容，并且我尝试过直接的 SQL 和 SP。 Sp vs SQL 的时间已经足够接近了，不必过分担心——我担心的是本地 vs 服务器的时间。
Local:
2Ghz dual-core
4Gb RAM
SQL 2008 Sp1
Microsoft SQL Server 2008 R2 (SP1) - 10.50.2500.0 (Intel X86)
Enterprise Edition on Windows NT 6.1 <X86> (Build 7601: Service Pack 1)
Server:
2Ghz dual-core
4Gb RAM
Microsoft SQL Server 2008 (SP1) - 10.0.2573.0 (X64)
Standard Edition (64-bit) on Windows NT 5.2 <X64> (Build 3790: Service Pack 2) (VM)
当我“本地”运行存储过程时，大约需要 6 秒才能完成。
当我对服务器运行存储过程时，大约需要 25 分钟才能完成！！！
[总插入次数 = 45,500]
我已尝试尽可能多地调整 SP 并避免参数嗅探，但不确定为什么这在几乎等效的机器上会慢得多（我知道 SQL Server 版本略有不同，但看不到为什么会有这么大的不同？）
我知道 SP 并不出色，但如果它在本地运行 6 秒，那么它不是完全裤子！如果在服务器上花费 60 秒，那仍然可以。有 15 次调用此 SP...所以 15*0:06 可以接受...15*25:00 不可以！
当这些 SP 没有运行时，服务器的负载非常低，而当它们在运行时，大约 50% 的 CPU（一个核心 100%？）。本地 CPU 永远不会超过 25%。
Apols 用于发布整个 SP...但是如果有一个可以设置为改进的选项，则看不到如何显示它的作用:(
ALTER PROCEDURE [dbo].[LoadProfitabilitySummaryByCustomer]
@inCustomerType char(2),
@inClearTable int = 0,
@inStartNum int,
@inEndNum int
WITH RECOMPILE
AS
BEGIN
SET ANSI_NULLS ON
DECLARE @customers TABLE (
CUSNUM CHAR(6) DEFAULT 0
,IILQAR DECIMAL(20,5) DEFAULT 0
,IILUSD DECIMAL(20,5) DEFAULT 0
,IILGPB DECIMAL(20,5) DEFAULT 0
,IILEUR DECIMAL(20,5) DEFAULT 0
,IILKWD DECIMAL(20,5) DEFAULT 0
,IILOTH DECIMAL(20,5) DEFAULT 0
,IILMTD DECIMAL(20,5) DEFAULT 0
,IILYTD DECIMAL(20,5) DEFAULT 0
,TCQAR DECIMAL(20,5) DEFAULT 0
,TCUSD DECIMAL(20,5) DEFAULT 0
,TCGPB DECIMAL(20,5) DEFAULT 0
,TCEUR DECIMAL(20,5) DEFAULT 0
,TCKWD DECIMAL(20,5) DEFAULT 0
,TCOTH DECIMAL(20,5) DEFAULT 0
,TCMTD DECIMAL(20,5) DEFAULT 0
,TCYTD DECIMAL(20,5) DEFAULT 0
)
DECLARE @CustomerType char(2)
DECLARE @ClearTable int
DECLARE @StartNum int
DECLARE @EndNum int
SET @CustomerType = @inCustomerType
SET @ClearTable = @inClearTable
SET @StartNum = @inStartNum
SET @EndNum = @inEndNum
DECLARE @sCustomerNumber char(6)
DECLARE @iDaysInMonth decimal
DECLARE @iDaysInYear decimal
DECLARE @dAvgCostQAR DECIMAL(20,5)
DECLARE @dAvgCostUSD DECIMAL(20,5)
DECLARE @dAvgCostGBP DECIMAL(20,5)
DECLARE @dAvgCostEUR DECIMAL(20,5)
DECLARE @dAvgCostKWD DECIMAL(20,5)
DECLARE @dAvgCostOTH DECIMAL(20,5)
DECLARE @dAvgCostTOT DECIMAL(20,5)
DECLARE @dTIIntIncLnsQAR DECIMAL(20,5)
DECLARE @dTIIntIncLnsUSD DECIMAL(20,5)
DECLARE @dTIIntIncLnsGBP DECIMAL(20,5)
DECLARE @dTIIntIncLnsEUR DECIMAL(20,5)
DECLARE @dTIIntIncLnsKWD DECIMAL(20,5)
DECLARE @dTIIntIncLnsOTH DECIMAL(20,5)
DECLARE @dTIIntIncLnsTOT DECIMAL(20,5)
DECLARE @dTIIntIncLnsYTD DECIMAL(20,5)
DECLARE @dTITradeCommQAR DECIMAL(20,5)
DECLARE @dTITradeCommUSD DECIMAL(20,5)
DECLARE @dTITradeCommGBP DECIMAL(20,5)
DECLARE @dTITradeCommEUR DECIMAL(20,5)
DECLARE @dTITradeCommKWD DECIMAL(20,5)
DECLARE @dTITradeCommOTH DECIMAL(20,5)
DECLARE @dTITradeCommTOT DECIMAL(20,5)
DECLARE @dTITradeCommYTD DECIMAL(20,5)
DECLARE @dtMaxDate varchar(30)
DECLARE @iReportYear int
DECLARE @START_DATE datetime
DECLARE @FIRST_MONTH datetime
DECLARE @END_MONTH datetime
DECLARE @iNumMonths int
DECLARE @iNumDaysToday int
INSERT INTO @customers (CUSNUM)
SELECT DISTINCT CUSNUM
FROM EQPRF_SUMMARY
WHERE CUSTYP = @CustomerType
AND CUSNUM >= @StartNum
AND CUSNUM < @EndNum
GROUP BY CUSNUM
UPDATE @customers
SET IILQAR = t2.Amount
FROM @customers c INNER JOIN
(
SELECT CUSNUM,
-SUM(ISNULL(CONVERT(decimal(20,5),t.TOTALMTDLCY),0)) as Amount
FROM TI_INTINCLOANS t
WHERE t.CCY = 'IILQAR'
AND t.LINEID = 'LN17'
GROUP BY t.CUSNUM
) AS t2
ON c.CUSNUM = t2.CUSNUM
UPDATE @customers
SET IILUSD = t2.Amount
FROM @customers c INNER JOIN
(
SELECT CUSNUM,
-SUM(ISNULL(CONVERT(decimal(20,5),t.TOTALMTDLCY),0)) as Amount
FROM TI_INTINCLOANS t
WHERE t.CCY = 'IILUSD'
AND t.LINEID = 'LN17'
GROUP BY t.CUSNUM
) AS t2
ON c.CUSNUM = t2.CUSNUM
--REPEAT FOR 14 OTHER CRITERIA
IF (@ClearTable = 1)
BEGIN
IF EXISTS (SELECT name FROM sysindexes WHERE name = 'IX_GROUP_ACCT') DROP INDEX IX_GROUP_ACCT ON PROFITABILITY_SUMMARY
TRUNCATE TABLE [PROFITABILITY_SUMMARY]
IF NOT EXISTS (SELECT name FROM sysindexes WHERE name = 'IX_GROUP_ACCT')
CREATE NONCLUSTERED INDEX IX_GROUP_ACCT
ON dbo.PROFITABILITY_SUMMARY(CUST_TYPE,GROUP_CODE,ACCOUNT)
WITH (FILLFACTOR = 90,PAD_INDEX = ON);
END
IF MONTH(getdate())= 1 SET @iReportYear = YEAR(DATEADD(m,-1,getdate())) -- get last month's year
ELSE SET @iReportYear = YEAR(getdate())
SET @START_DATE = CAST('1/1/'+cast(@iReportYear as varchar(4)) as datetime) --first day of report year (If Jan, it's last year)
SET @FIRST_MONTH = DATEADD(day,-DAY(getdate())+1,getdate())--first day of current month
SET @END_MONTH = DATEADD(day,-1,@FIRST_MONTH)--determine last day of the previous month
SET @FIRST_MONTH = DATEADD(M,-1,@FIRST_MONTH)--reset to first day of the previous month
SET @FIRST_MONTH = CAST(FLOOR( CAST( @FIRST_MONTH AS FLOAT ) ) AS DATETIME) --TRUNCATE HOURS
SET @END_MONTH = CAST(FLOOR( CAST( @END_MONTH AS FLOAT ) ) AS DATETIME) --TRUNCATE HOURS
SELECT TOP 1
@dAvgCostQAR = AVGCOSTQAR
,@dAvgCostUSD = AVGCOSTUSD
,@dAvgCostGBP = AVGCOSTGBP
,@dAvgCostEUR = AVGCOSTEUR
,@dAvgCostKWD = AVGCOSTKWD
,@dAvgCostOTH = AVGCOSTOTH
,@dAvgCostTOT = AVGCOSTTOT
FROM dbo.PRFCOSTF
SET @dtMaxDate = (select top 1 s.txnstmp from EQPRF_SUMMARY s)
SELECT @iDaysInMonth = dbo.ufn_GetDaysInMonth(CAST(@dtMaxDate as datetime))
SELECT @iDaysInYear = 360
SET @iNumDaysToday = (DATEDIFF(dd, @START_DATE, @END_MONTH)+1)
DECLARE CustomerCursor CURSOR FAST_FORWARD
FOR
SELECT CUSNUM
FROM @customers
OPEN CustomerCursor
FETCH NEXT FROM CustomerCursor
INTO @sCustomerNumber
WHILE @@FETCH_STATUS = 0
BEGIN
SELECT
@dTIIntIncLnsQAR = c.IILQAR
,@dTIIntIncLnsUSD = c.IILUSD
,@dTIIntIncLnsGBP = c.IILGPB
,@dTIIntIncLnsEUR = c.IILEUR
,@dTIIntIncLnsKWD = c.IILKWD
,@dTIIntIncLnsOTH = c.IILOTH
,@dTIIntIncLnsTOT = c.IILMTD
,@dTIIntIncLnsYTD = c.IILYTD
,@dTITradeCommQAR = c.TCQAR
,@dTITradeCommUSD = c.TCUSD
,@dTITradeCommGBP = c.TCGPB
,@dTITradeCommEUR = c.TCEUR
,@dTITradeCommKWD = c.TCKWD
,@dTITradeCommOTH = c.TCOTH
,@dTITradeCommTOT = c.TCMTD
,@dTITradeCommYTD = c.TCYTD
FROM @customers c
WHERE c.CUSNUM = @sCustomerNumber
INSERT INTO PROFITABILITY_SUMMARY
SELECT SORT_ORDER = 1, LINE_NO = 'LN01', RPT_DATE=cast(TXNSTMP as datetime),
LINE_TITLE='Month Loans Outstanding',
ACCOUNT = RTRIM(CUSNUM),
CUST_TYPE = RTRIM(CUSTYP),
GROUP_CODE = (CASE
WHEN RTRIM(CUSGRP) IS NULL OR RTRIM(CUSGRP)='' THEN LEFT(CUSNAME,3)+'--'+RTRIM(CUSNUM)
ELSE RTRIM(CUSGRP)
END),
PARENT_COUNTRY = RTRIM(CUSNAP),
RM_CODE = RTRIM(CUSACO),
RM_NAME = RTRIM(CUSRNAM),
CUST_NAME = RTRIM(CUSNAME),
RISK_CODE = RTRIM(CUSRSKE),
QAR = ISNULL((SELECT CAST(CURDLAMT AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='QAR'),0),
USD = ISNULL((SELECT CAST(CURDLAMT AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='USD'),0),
GBP = ISNULL((SELECT CAST(CURDLAMT AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='GBP'),0),
EUR = ISNULL((SELECT CAST(CURDLAMT AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='EUR'),0),
KWD = ISNULL((SELECT CAST(CURDLAMT AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='KWD'),0),
OTHER = ISNULL((SELECT sum(CAST(CURDLAMT AS DECIMAL(20,5))) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY NOT IN ('QAR', 'USD', 'GBP', 'EUR', 'KWD')),0),
TOTAL = SUM(CAST(CURDLAMT AS DECIMAL(20,5))),
YTD = 0
FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY] where CUSNUM=@sCustomerNumber
GROUP BY CUSNUM,CUSTYP,CUSGRP,CUSNAP,CUSACO,CUSRNAM,CUSNAME,CUSRSKE,TXNSTMP
UNION ALL
SELECT SORT_ORDER = 2,LINE_NO = 'LN02', RPT_DATE=cast(TXNSTMP as datetime),
LINE_TITLE ='Average Loans Outstanding',
ACCOUNT = RTRIM(CUSNUM),
CUST_TYPE = RTRIM(CUSTYP),
GROUP_CODE = (CASE
WHEN RTRIM(CUSGRP) IS NULL OR RTRIM(CUSGRP)='' THEN LEFT(CUSNAME,3)+'--'+RTRIM(CUSNUM)
ELSE RTRIM(CUSGRP)
END),
PARENT_COUNTRY = RTRIM(CUSNAP),
RM_CODE = RTRIM(CUSACO),
RM_NAME = RTRIM(CUSRNAM),
CUST_NAME = RTRIM(CUSNAME),
RISK_CODE = RTRIM(CUSRSKE),
QAR = ISNULL((SELECT CAST(LNAVGMTD AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='QAR'),0),
USD = ISNULL((SELECT CAST(LNAVGMTD AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='USD'),0),
GBP = ISNULL((SELECT CAST(LNAVGMTD AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='GBP'),0),
EUR = ISNULL((SELECT CAST(LNAVGMTD AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='EUR'),0),
KWD = ISNULL((SELECT CAST(LNAVGMTD AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='KWD'),0),
OTHER = ISNULL((SELECT SUM(CAST(LNAVGMTD AS DECIMAL(20,5))) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY NOT IN ('QAR', 'USD', 'GBP', 'EUR', 'KWD')),0),
TOTAL = SUM(CAST(LNAVGMTD AS DECIMAL(20,5))),
YTD = SUM(CAST(LNAVGYTD AS DECIMAL(20,5)))
FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY] where CUSNUM=@sCustomerNumber
GROUP BY CUSNUM,CUSTYP,CUSGRP,CUSNAP,CUSACO,CUSRNAM,CUSNAME,CUSRSKE,TXNSTMP
------------------------------------------------------------------------------
--THERE ARE 32 LINES IN TOTAL...ALL FOLLOWING ROUGHLY SAME PATTERN
------------------------------------------------------------------------------
UNION ALL
SELECT SORT_ORDER = 32,LINE_NO = 'GRANTOTAL',RPT_DATE=cast(TXNSTMP as datetime),
LINE_TITLE ='Total Income',
ACCOUNT = RTRIM(CUSNUM),
CUST_TYPE = RTRIM(CUSTYP),
GROUP_CODE = (CASE
WHEN RTRIM(CUSGRP) IS NULL OR RTRIM(CUSGRP)='' THEN LEFT(CUSNAME,3)+'--'+RTRIM(CUSNUM)
ELSE RTRIM(CUSGRP)
END),
PARENT_COUNTRY = RTRIM(CUSNAP),
RM_CODE = RTRIM(CUSACO),
RM_NAME = RTRIM(CUSRNAM),
CUST_NAME = RTRIM(CUSNAME),
RISK_CODE = RTRIM(CUSRSKE),
QAR = @dTITradeCommQAR+@dTIIntIncLnsQAR+ISNULL((SELECT CAST(SUSINTMTD AS DECIMAL(20,5)) + CAST(INTINCMTD AS DECIMAL(20,5))- cast(COSTLNMTD as DECIMAL(20,5))+cast(COSTDPMTD as DECIMAL(20,5)) - CAST(INTEXPMTD AS DECIMAL(20,5))+CAST(LNFEEMTD AS DECIMAL(20,5))+CAST(OTRINCMTD AS DECIMAL(20,5))+CAST(EXCHINCMTD AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='QAR'),0),
USD = @dTITradeCommUSD+@dTIIntIncLnsUSD+ISNULL((SELECT CAST(SUSINTMTD AS DECIMAL(20,5)) + CAST(INTINCMTD AS DECIMAL(20,5))- cast(COSTLNMTD as DECIMAL(20,5))+cast(COSTDPMTD as DECIMAL(20,5)) - CAST(INTEXPMTD AS DECIMAL(20,5))+CAST(LNFEEMTD AS DECIMAL(20,5))+CAST(OTRINCMTD AS DECIMAL(20,5))+CAST(EXCHINCMTD AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='USD'),0),
GBP = @dTITradeCommGBP+@dTIIntIncLnsGBP+ISNULL((SELECT CAST(SUSINTMTD AS DECIMAL(20,5)) + CAST(INTINCMTD AS DECIMAL(20,5))- cast(COSTLNMTD as DECIMAL(20,5))+cast(COSTDPMTD as DECIMAL(20,5)) - CAST(INTEXPMTD AS DECIMAL(20,5))+CAST(LNFEEMTD AS DECIMAL(20,5))+CAST(OTRINCMTD AS DECIMAL(20,5))+CAST(EXCHINCMTD AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='GBP'),0),
EUR = @dTITradeCommEUR+@dTIIntIncLnsEUR+ISNULL((SELECT CAST(SUSINTMTD AS DECIMAL(20,5)) + CAST(INTINCMTD AS DECIMAL(20,5))- cast(COSTLNMTD as DECIMAL(20,5))+cast(COSTDPMTD as DECIMAL(20,5)) - CAST(INTEXPMTD AS DECIMAL(20,5))+CAST(LNFEEMTD AS DECIMAL(20,5))+CAST(OTRINCMTD AS DECIMAL(20,5))+CAST(EXCHINCMTD AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='EUR'),0),
KWD = @dTITradeCommKWD+@dTIIntIncLnsKWD+ISNULL((SELECT CAST(SUSINTMTD AS DECIMAL(20,5)) + CAST(INTINCMTD AS DECIMAL(20,5))- cast(COSTLNMTD as DECIMAL(20,5))+cast(COSTDPMTD as DECIMAL(20,5)) - CAST(INTEXPMTD AS DECIMAL(20,5))+CAST(LNFEEMTD AS DECIMAL(20,5))+CAST(OTRINCMTD AS DECIMAL(20,5))+CAST(EXCHINCMTD AS DECIMAL(20,5)) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY='KWD'),0),
OTHER=@dTITradeCommOTH+@dTIIntIncLnsOTH+ISNULL((SELECT SUM(CAST(SUSINTMTD AS DECIMAL(20,5)))+ SUM(CAST(INTINCMTD AS DECIMAL(20,5)))-SUM(CAST(COSTLNMTD AS DECIMAL(20,5)))+SUM(CAST(COSTDPMTD AS DECIMAL(20,5))) - SUM(CAST(INTEXPMTD AS DECIMAL(20,5)))+SUM(CAST(LNFEEMTD AS DECIMAL(20,5)))+SUM(CAST(OTRINCMTD AS DECIMAL(20,5)))+SUM(CAST(EXCHINCMTD AS DECIMAL(20,5))) FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY]
where CUSNUM=@sCustomerNumber AND CUSCCY NOT IN ('QAR', 'USD', 'GBP', 'EUR', 'KWD')),0),
TOTAL = @dTITradeCommTOT+@dTIIntIncLnsTOT+ SUM(CAST(SUSINTMTD AS DECIMAL(20,5)))+SUM(CAST(INTINCMTD AS DECIMAL(20,5)))-SUM(CAST(COSTLNMTD AS DECIMAL(20,5)))+SUM(cast(COSTDPMTD as DECIMAL(20,5))) - SUM(CAST(INTEXPMTD AS DECIMAL(20,5)))+SUM(CAST(LNFEEMTD AS DECIMAL(20,5)))+SUM(CAST(OTRINCMTD AS DECIMAL(20,5)))+SUM(CAST(EXCHINCMTD AS DECIMAL(20,5))),
YTD = @dTITradeCommYTD+@dTIIntIncLnsYTD+ SUM(CAST(SUSINTYTD AS DECIMAL(20,5)))+SUM(CAST(INTINCYTD AS DECIMAL(20,5)))-SUM(CAST(COSTLNYTD AS DECIMAL(20,5)))+SUM(cast(COSTDPYTD as DECIMAL(20,5))) - SUM(CAST(INTEXPYTD AS DECIMAL(20,5)))+SUM(CAST(LNFEEYTD AS DECIMAL(20,5)))+SUM(CAST(OTRINCYTD AS DECIMAL(20,5)))+SUM(CAST(EXCHINCYTD AS DECIMAL(20,5)))
FROM [MISReportInterface].[dbo].[EQPRF_SUMMARY] where CUSNUM=@sCustomerNumber
GROUP BY CUSNUM,CUSTYP,CUSGRP,CUSNAP,CUSACO,CUSRNAM,CUSNAME,CUSRSKE,TXNSTMP
ORDER BY 1
FETCH NEXT
FROM CustomerCursor
INTO @sCustomerNumber
END
CLOSE CustomerCursor
DEALLOCATE CustomerCursor
END
【问题讨论】：
为什么这被标记为关闭？这是一个合理的问题：为什么 SP 在服务器上的运行速度会比本地慢得多？如果有原因（代码太长？），请发表评论，我会相应地进行编辑。 相同的数据库（表中的数据相同）？ 虚拟机是（VM）吗？ 是的，相同的数据库（生产副本）和虚拟机上的产品。 插入 db 可能会导致磁盘写入负载过高。通过他们的（不是专家）“虚拟磁盘接口”，VM 并不是真正适合在硬件上进行高负载写入。当性能成为问题时，我总是选择不虚拟化 SQL Server。 【参考方案1】：桌面无负载，服务器负载低。方式不同。如果您想要公平比较，请关闭用户并将两个数据库置于单用户模式。
这些插入需要获取锁。即使是低负载也可能持有很多锁。
另一个需要注意的是索引碎片，但我敢打赌它可以用锁来解释。
如果您有活动用户使用共享锁，他们不会互相阻止。
但是共享锁会阻止 SP 获取更新锁。
脏读（无锁）不会阻塞更新锁。
启动用户并进行测试。如果时间减少，那么很可能是锁定问题。
【讨论】：
谢谢，但试过了。没有用户（除了我）并且表格对用户来说是只读的（它用于报告 - 所以他们只能通过 s-s-rS 访问......我停止了测试） 如您所料，Profiler 显示为插入获取/释放了很多锁...有没有其他方法可以做到这一点。例如批量插入，以便将它们全部放在一个“锁定”下？ 如果它是一个只读表，那么你如何插入记录。我解释了一个共享锁，你的回答是“无论如何都是只读的”。 "对用户只读"...即他们无法执行插入。这并没有向我解释共享锁，它只是告诉我我可能拥有它们。【参考方案2】：答案：VM Ware 导致磁盘写入速度非常慢。
物理服务器上的相同数据库非常快。 VM 服务器上的同一个数据库又变慢了。
【讨论】：
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