从 DotNet 执行存储过程需要很长时间,但在 SSMS 中它是立即的
我在 SQL Server 2000 上有一个存储过程,它有 3 个参数。当我使用 SqlCommand.ExecuteReader () 从 DotNet 调用存储过程时,大约需要 28 秒。
当我直接在 SSMS 中运行相同的查询时,它会立即返回。
当我从存储过程中取出查询并直接使用 DotNet 运行它时,它也会立即返回。
这些是 SQL Profiler 会话的结果
SP Inside Dot Net
- 持续时间:28030
- 读取:2663365
- 写入:0
SP Inside SSMS
- 持续时间:450
- 读取:23535
- 写入:65
直接在 Dot Net 内查询
- 持续时间:360
- 读取:24865
- 写入:57
以下事情对我来说很突出:
- SSMS 的统计数据和 Dot Net 中的直接查询非常相似
- Dot Net SP 做了很多工作读取但没有写入
- 另外两个读取很少,但写入几次
任何帮助将不胜感激。
这是 SP 的一个稍微模糊的版本:
我怀疑这是一个查询计划问题,因为即使我从 DotNet 重复运行它,我总是得到相同的结果。
这是由于 IP 问题而稍作修改的 SP 版本。我希望它仍然有意义:
SELECT
t1.pkiOrderID,
t1.fkiBasketId,
t1.sOriginBasketCode,
t1.dtDateCreated,
t1.sOrderCode,
t1.fkiUserCde,
t1.fkiOrgCde,
t1.sApprovalPerson,
t1.dtDateApproved,
t1.sRequestNo,
t1.dtRequiredDate,
t1.Requestor,
t1.OnBehalfOf,
t1.OrderDesc,
t1.OrderTypeId,
t1.fkiAgentID,
t1.fkiAgentRegionID,
stat.iStatus,
count(oi.pkiOrderItemId) as OrderItems,
count(wf.fkiOrderId) as WorkflowCount,
t1.Currency_Id,
t1.ExchangeRate,
t1.ref_odr_idn,
t2.sOrderCode as ref_odr_cde,
t1.ref_rfq_nbr,
t1.ref_rfs_nbr,
t1.ref_doc_nbr,
t1.ref_rsn,
t1.ref_forip_cde,
t1.ref_fa_nbr,
t1.odr_sub_typ
FROM tbl1 t1 INNER JOIN
tbl1Status stat ON
t1.pkiOrderID = stat.fkiOrderID AND
stat.dtDateStatusChanged = (SELECT MAX(stat2.dtDateStatusChanged)
FROM tbl1Status stat2
WHERE stat2.fkiOrderId = t1.pkiOrderID) LEFT OUTER JOIN
tbl1Item oi ON
t1.pkiOrderID = oi.fkiOrderId LEFT OUTER JOIN
tbl1Workflows wf ON
t1.pkiOrderID = wf.fkiOrderId LEFT OUTER JOIN
tbl1 t2 ON
t1.ref_odr_idn = t2.pkiOrderID
WHERE (t1.fkiUserCde = 'x'
or t1.fkiUserCde in (select fkiUserCde from tbl1 where fkiOrgCde in
(select sys_org_cde from tbl3 t3 where t3.sys_lnk_org_cde = '123')))
AND ((t1.fkiOrgCde = '123'
and ('123' not in (select sys_org_cde from tbl3 t3)
or (t1.OrderTypeID < 1 or stat.iStatus IN (2,3,4,5,6,7))))
OR (t1.fkiOrgCde in (select sys_org_cde from tbl3 t3 where t3.sys_lnk_org_cde = '123')
and t1.OrderTypeID = 1
and stat.iStatus NOT IN (2,3,4,5,6,7)))
AND t1.OrderTypeID = 2
GROUP BY
t1.pkiOrderID,
t1.fkiBasketId,
t1.sOriginBasketCode,
t1.dtDateCreated,
t1.sOrderCode,
t1.fkiUserCde,
t1.fkiOrgCde,
t1.sApprovalPerson,
t1.dtDateApproved,
t1.sRequestNo,
t1.dtRequiredDate,
t1.Requestor,
t1.OnBehalfOf,
t1.OrderDesc,
t1.OrderTypeId,
t1.fkiAgentID,
t1.fkiAgentRegionID,
stat.iStatus,
t1.Currency_Id,
t1.ExchangeRate,
t1.ref_odr_idn,
t2.sOrderCode,
t1.ref_rfq_nbr,
t1.ref_rfs_nbr,
t1.ref_doc_nbr,
t1.ref_rsn,
t1.ref_forip_cde,
t1.ref_fa_nbr,
t1.odr_sub_typ
ORDER BY t1.dtDateCreated DESC
对格式感到抱歉。我努力让它在论坛上可读。
I have a stored proc on SQL Server 2000 that takes 3 parameters. When I call the stored proc from DotNet using SqlCommand.ExecuteReader () it takes about 28 seconds.
When I run the same query inside SSMS directly it returns immediately.
When I take the query out of the stored proc and run it directly using DotNet it also returns immediately.
These are the results from a SQL Profiler session
SP Inside Dot Net
- Duration: 28030
- Reads: 2663365
- Writes: 0
SP Inside SSMS
- Duration: 450
- Reads: 23535
- Writes: 65
Query directly inside Dot Net
- Duration: 360
- Reads: 24865
- Writes: 57
The following things stand out to me:
- The stats for the SSMS and direct query in Dot Net are very similar
- The Dot Net SP one does a huge amount of reads but no writes
- The other two make very few reads, but a couple of writes
Any help would be appreciated.
Here is a slightly obviscated version of the SP:
I doubt that it is a query plan issue because even if I run it repeatedly from DotNet, I always get the same results.
Here is a version of the SP that's been altered slightly because of IP issues. I hope it still makes sense:
SELECT
t1.pkiOrderID,
t1.fkiBasketId,
t1.sOriginBasketCode,
t1.dtDateCreated,
t1.sOrderCode,
t1.fkiUserCde,
t1.fkiOrgCde,
t1.sApprovalPerson,
t1.dtDateApproved,
t1.sRequestNo,
t1.dtRequiredDate,
t1.Requestor,
t1.OnBehalfOf,
t1.OrderDesc,
t1.OrderTypeId,
t1.fkiAgentID,
t1.fkiAgentRegionID,
stat.iStatus,
count(oi.pkiOrderItemId) as OrderItems,
count(wf.fkiOrderId) as WorkflowCount,
t1.Currency_Id,
t1.ExchangeRate,
t1.ref_odr_idn,
t2.sOrderCode as ref_odr_cde,
t1.ref_rfq_nbr,
t1.ref_rfs_nbr,
t1.ref_doc_nbr,
t1.ref_rsn,
t1.ref_forip_cde,
t1.ref_fa_nbr,
t1.odr_sub_typ
FROM tbl1 t1 INNER JOIN
tbl1Status stat ON
t1.pkiOrderID = stat.fkiOrderID AND
stat.dtDateStatusChanged = (SELECT MAX(stat2.dtDateStatusChanged)
FROM tbl1Status stat2
WHERE stat2.fkiOrderId = t1.pkiOrderID) LEFT OUTER JOIN
tbl1Item oi ON
t1.pkiOrderID = oi.fkiOrderId LEFT OUTER JOIN
tbl1Workflows wf ON
t1.pkiOrderID = wf.fkiOrderId LEFT OUTER JOIN
tbl1 t2 ON
t1.ref_odr_idn = t2.pkiOrderID
WHERE (t1.fkiUserCde = 'x'
or t1.fkiUserCde in (select fkiUserCde from tbl1 where fkiOrgCde in
(select sys_org_cde from tbl3 t3 where t3.sys_lnk_org_cde = '123')))
AND ((t1.fkiOrgCde = '123'
and ('123' not in (select sys_org_cde from tbl3 t3)
or (t1.OrderTypeID < 1 or stat.iStatus IN (2,3,4,5,6,7))))
OR (t1.fkiOrgCde in (select sys_org_cde from tbl3 t3 where t3.sys_lnk_org_cde = '123')
and t1.OrderTypeID = 1
and stat.iStatus NOT IN (2,3,4,5,6,7)))
AND t1.OrderTypeID = 2
GROUP BY
t1.pkiOrderID,
t1.fkiBasketId,
t1.sOriginBasketCode,
t1.dtDateCreated,
t1.sOrderCode,
t1.fkiUserCde,
t1.fkiOrgCde,
t1.sApprovalPerson,
t1.dtDateApproved,
t1.sRequestNo,
t1.dtRequiredDate,
t1.Requestor,
t1.OnBehalfOf,
t1.OrderDesc,
t1.OrderTypeId,
t1.fkiAgentID,
t1.fkiAgentRegionID,
stat.iStatus,
t1.Currency_Id,
t1.ExchangeRate,
t1.ref_odr_idn,
t2.sOrderCode,
t1.ref_rfq_nbr,
t1.ref_rfs_nbr,
t1.ref_doc_nbr,
t1.ref_rsn,
t1.ref_forip_cde,
t1.ref_fa_nbr,
t1.odr_sub_typ
ORDER BY t1.dtDateCreated DESC
Sorry about the formatting. I struggled to get it readable at all on the forum.
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由于我的评论似乎提供了正确的答案,因此我决定本着 stackoverflow 的精神将其转变为后代的完整答案。
您的问题似乎是由 SQL Server 的 参数 引起的嗅探。
为了防止这种情况发生,只需将传入的参数值分配给在 SP 顶部声明的其他变量即可。
查看这篇关于它的好文章
示例:
我从 eggheadcafe.com。
编辑:根据 Johann Strydom 的评论,这是另一种选择:
优化参数驱动使用 SQL Server OPTIMIZE FOR Hint 进行查询。
Since my comment seemed to provide the correct answer, I decided to move it into a full answer for posterity in the spirit of stackoverflow.
Your problem seems to be caused by SQL Server's Parameter Sniffing.
To prevent it, just assign your incoming parameter values to other variables declared right at the top of your SP.
See this nice Article about it
Example:
I copied this information from eggheadcafe.com.
Edit: As per Johann Strydom's comment, here is another option:
Optimize Parameter Driven Queries with SQL Server OPTIMIZE FOR Hint.
只是重新创建了存储过程并修复了它。确实很奇怪。
Just recreated the stored proc and that fixed it. Very strange indeed.