就是这么简单:在连接到 Oracle 11g 的 SQL Developer 中运行只需几秒钟的查询在 SSRS 2008 R2 中需要 15-25 分钟。我还没有尝试过其他版本的 SSRS。到目前为止,我正在从 VS 2008 执行所有报告。
我正在使用 OLE DB 提供程序“OraOLEDB.Oracle.1”,过去它似乎比使用 Oracle 提供程序给了我更好的结果。
以下是我目前能够确定的:
• 延迟发生在数据集执行阶段,与结果集或渲染时间无关。 (通过直接从我插入的表中选择相同的行集来证明。)
• SSRS 本身没有挂断。它真正在等待 Oracle,这是延迟所在(通过从 Oracle 端终止 DB session 来证明,这导致 SSRS 中关于 session 被终止的提示错误)。
• 我曾尝试使用 :Parameter 形式的参数进行直接查询。我的查询的早期版本更简单,可用于直接查询,但似乎超过了一定的复杂性,查询将永远从 SSRS 开始。
• 然后我切换到执行一个 SP,将查询结果插入到一个表或全局临时表中。这帮助了一段时间,让我比直接查询更远,但同样,几乎似乎增加的查询复杂性或长度最终也破坏了这种方法。注意:运行填充表的 SP 是有效的,因为在 DataSource 选项中选中“使用单个事务”选项后,DataSet 将按照它们在 rdl 文件中的出现顺序运行。只要满足所有参数,不返回字段的数据集仍会运行。
• 我刚刚尝试了一个返回表的函数,但仍然没有任何改进,即使在 SQL Developer 中使用文字参数直接调用在 1-5 秒内返回。
• 有问题的数据库没有统计数据。它是供应商创建的产品的一部分,我们没有时间或管理层支持创建/更新统计数据。我使用 DYNAMIC_SAMPLING 提示来动态计算统计数据并获得了更好的执行计划:如果没有统计数据,基于成本的优化器使用 LOOP 连接而不是 HASH 连接的效果很差,导致类似的多分钟执行时间。因此,我输入了查询提示以强制连接顺序并使其使用战略性哈希连接,从而将执行时间缩短到几秒钟。我没有回去尝试使用这些执行提示在 SSRS 中直接查询。
• 我从我们的 Oracle DBA 那里得到了一些帮助,他设置了一个跟踪(或任何 Oracle 等价物),他能够看到正在运行的东西,但到目前为止他还没有发现任何有用的东西。不幸的是,他的时间有限,我们无法真正深入了解服务器端正在执行的内容。我没有快速完成此操作的经验,也没有时间研究如何自己完成此操作。关于如何确定正在发生的事情的建议将不胜感激。
我唯一的假设是:
• 查询以某种方式获得了错误的执行计划。例如,当有数以万计的“左”或外循环行而不是几百行时,不正确地使用 LOOP 连接而不是 HASH 连接。
• SSRS 可能将参数作为 nvarchar(4000) 或其他东西而不是合理的东西提交,并且由于 Oracle SP 和函数参数没有长度规范但从查询调用中获取它们的执行长度,因此一些过程,例如参数嗅探是像上一点一样弄乱执行计划。
• SSRS/提供者以某种方式重写了查询。我正在使用多值参数,但不是原样:参数作为表达式 Join(Parameters!MultiValuedParameter.Value, ",") 提交,因此不需要任何重写。只是一个简单的绑定(bind)和提交。我不明白在 SP 和函数调用中这怎么可能是真的,但是天哪,还能是什么?
我意识到这是一个非常复杂和冗长的查询,但它正是我所需要的。它会在 1-5 秒内运行,具体取决于请求的数据量。复杂性的一些原因是:
无论如何,这里是查询,SP 版本(尽管我认为它不会有太大帮助)。
create or replace
PROCEDURE VendorInvoiceSummary (
FromDate IN date,
ToDate IN date,
CostCenterList IN varchar2,
IncludeWeekly IN varchar2,
ComparisonMonths IN number,
IncludeYTD IN varchar2
)
AS
BEGIN
INSERT INTO InvoiceSummary (Mo, CostCenter, Vendor, VendorName, Section, TimeUnit, Amt)
SELECT
Mo,
CostCenter,
Vendor,
VendorName,
Section,
TimeUnit,
Amt
FROM (
WITH CostCenters AS (
SELECT Substr(REGEXP_SUBSTR(CostCenterList, '[^,]+', 1, LEVEL) || ' ', 1, 15) CostCenter
FROM DUAL
CONNECT BY LEVEL <= Length(CostCenterList) - Length(Replace(CostCenterList, ',', '')) + 1
), Invoices AS (
SELECT /*+ORDERED USE_HASH(D)*/
TRUNC(I.Invoice_Dte, 'YYYY') Yr,
TRUNC(I.Invoice_Dte, 'MM') Mo,
D.Dis_Acct_Unit CostCenter,
I.Vendor,
V.Vendor_VName,
CASE
WHEN I.Invoice_Dte >= FromDate AND I.Invoice_Dte < ToDate
THEN (TRUNC(I.Invoice_Dte, 'W') - TRUNC(I.Invoice_Dte, 'MM')) / 7 + 1
ELSE 0
END WkNum,
Sum(D.To_Base_Amt) To_Base_Amt
FROM
ICCompany C
INNER JOIN APInvoice I
ON C.Company = I.Company
INNER JOIN APDistrib D
ON C.Company = D.Company
AND I.Invoice = D.Invoice
AND I.Vendor = D.Vendor
AND I.Suffix = D.Suffix
INNER JOIN CostCenters CC
ON D.Dis_Acct_Unit = CC.CostCenter
INNER JOIN APVenMast V ON I.Vendor = V.Vendor
WHERE
D.Cancel_Seq = 0
AND I.Cancel_Seq = 0
AND I.Invoice_Dte >= Least(ADD_MONTHS(FromDate, -ComparisonMonths), TRUNC(FromDate, 'YYYY'))
AND I.Invoice_Dte < ToDate
AND V.Vendor_Group = '1 ' -- index help
GROUP BY
TRUNC(I.Invoice_Dte, 'YYYY'),
TRUNC(I.Invoice_Dte, 'MM'),
D.Dis_Acct_Unit,
I.Vendor,
V.Vendor_VName,
CASE
WHEN I.Invoice_Dte >= FromDate AND I.Invoice_Dte < ToDate
THEN (TRUNC(I.Invoice_Dte, 'W') - TRUNC(I.Invoice_Dte, 'MM')) / 7 + 1
ELSE 0
END
), Months AS (
SELECT ADD_MONTHS(Least(ADD_MONTHS(FromDate, -ComparisonMonths), TRUNC(FromDate, 'YYYY')), LEVEL - 1) Mo
FROM DUAL
CONNECT BY LEVEL <= MONTHS_BETWEEN(ToDate, Least(ADD_MONTHS(FromDate, -ComparisonMonths), TRUNC(FromDate, 'YYYY')))
), Sections AS (
SELECT 1 Section, 1 StartUnit, 5 EndUnit FROM DUAL
UNION ALL SELECT 2, 0, ComparisonMonths FROM DUAL
UNION ALL SELECT 3, 1, 1 FROM DUAL WHERE IncludeYTD = 'Y'
), Vals AS (
SELECT LEVEL - 1 TimeUnit
FROM DUAL
CONNECT BY LEVEL <= (SELECT Max(EndUnit) FROM Sections) + 1
), TimeUnits AS (
SELECT S.Section, V.TimeUnit
FROM
Sections S
INNER JOIN Vals V
ON V.TimeUnit BETWEEN S.StartUnit AND S.EndUnit
), Names AS (
SELECT DISTINCT
M.Mo,
Coalesce(I.Vendor, '0') Vendor,
Coalesce(I.Vendor_VName, 'No Paid Invoices') Vendor_VName,
Coalesce(I.CostCenter, ' ') CostCenter
FROM
Months M
LEFT JOIN Invoices I
ON Least(ADD_MONTHS(M.Mo, -ComparisonMonths), TRUNC(M.Mo, 'YYYY')) < I.Mo
AND M.Mo >= I.Mo
WHERE
M.Mo >= FromDate
AND M.Mo < ToDate
)
SELECT
N.Mo,
N.CostCenter,
N.Vendor,
N.Vendor_VName VendorName,
T.Section,
T.TimeUnit,
Sum(I.To_Base_Amt) Amt
FROM
Names N
CROSS JOIN TimeUnits T
LEFT JOIN Invoices I
ON N.CostCenter = I.CostCenter
AND N.Vendor = I.Vendor
AND (
(
T.Section = 1 -- Weeks for current month
AND N.Mo = I.Mo
AND T.TimeUnit = I.WkNum
) OR (
T.Section = 2 -- Summary months
AND ADD_MONTHS(N.Mo, -T.TimeUnit) = I.Mo
) OR (
T.Section = 3 -- YTD
AND I.Mo BETWEEN TRUNC(N.Mo, 'YYYY') AND N.Mo
)
)
WHERE
N.Mo >= FromDate
AND N.Mo < ToDate
AND NOT ( -- Only 4 weeks when a month is less than 28 days long
T.Section = 2
AND T.TimeUnit = 5
AND TRUNC(N.Mo + 28, 'MM') <> N.Mo
AND I.CostCenter IS NULL
) AND (
T.Section <> 1
OR IncludeWeekly = 'Y'
)
GROUP BY
N.Mo,
N.CostCenter,
N.Vendor,
N.Vendor_VName,
T.Section,
T.TimeUnit
) X;
COMMIT;
END;
更新
即使在学习了所有关于 Oracle 执行计划和提示(翻译我的 SQL Server 知识)之后,我仍然无法让查询在 SSRS 中快速运行,直到我分两步运行,首先将真实的表结果放入
GLOBAL TEMPORARY TABLE
然后第二个从中提取数据。 DYNAMIC_SAMPLING
给了我一个很好的执行计划,然后我使用连接和访问提示复制了它。这是最终的 SP(它不能是函数,因为在 Oracle 中,当在 SELECT 语句中调用该函数时,您无法在该函数中执行 DML):有时我发誓它忽略了我的连接提示,例如
swap_join_inputs
和 no_swap_join_inputs
,但从我的阅读来看,显然甲骨文只会在实际上无法使用或您做错了什么时忽略提示。幸运的是,表适本地交换了(如在 USE_NL(CC)
的情况下,它可靠地将 CC 表作为交换的左输入,即使它最后加入)。CREATE OR REPLACE
PROCEDURE VendorInvoicesSummary (
FromDate IN date,
ToDate IN date,
CostCenterList IN varchar2,
IncludeWeekly IN varchar2,
ComparisonMonths IN number,
IncludeYTD IN varchar2
)
AS
BEGIN
INSERT INTO InvoiceTemp (Yr, Mo, CostCenter, Vendor, WkNum, Amt) -- A global temporary table
SELECT /*+LEADING(C I D CC) USE_HASH(I D) USE_NL(CC)*/
TRUNC(I.Invoice_Dte, 'YYYY') Yr,
TRUNC(I.Invoice_Dte, 'MM') Mo,
D.Dis_Acct_Unit CostCenter,
I.Vendor,
CASE
WHEN I.Invoice_Dte >= FromDate AND I.Invoice_Dte < ToDate
THEN (TRUNC(I.Invoice_Dte, 'W') - TRUNC(I.Invoice_Dte, 'MM')) / 7 + 1
ELSE 0
END WkNum,
Sum(D.To_Base_Amt) To_Base_Amt
FROM
ICCompany C
INNER JOIN APInvoice I
ON C.Company = I.Company
INNER JOIN APDistrib D
ON C.Company = D.Company
AND I.Invoice = D.Invoice
AND I.Vendor = D.Vendor
AND I.Suffix = D.Suffix
INNER JOIN (
SELECT Substr(REGEXP_SUBSTR(CostCenterList, '[^,]+', 1, LEVEL) || ' ', 1, 15) CostCenter
FROM DUAL
CONNECT BY LEVEL <= Length(CostCenterList) - Length(Replace(CostCenterList, ',', '')) + 1
) CC ON D.Dis_Acct_Unit = CC.CostCenter
WHERE
D.Cancel_Seq = 0
AND I.Cancel_Seq = 0
AND I.Invoice_Dte >= Least(ADD_MONTHS(FromDate, -ComparisonMonths), TRUNC(FromDate, 'YYYY'))
AND I.Invoice_Dte < ToDate
GROUP BY
TRUNC(I.Invoice_Dte, 'YYYY'),
TRUNC(I.Invoice_Dte, 'MM'),
D.Dis_Acct_Unit,
I.Vendor,
CASE
WHEN I.Invoice_Dte >= FromDate AND I.Invoice_Dte < ToDate
THEN (TRUNC(I.Invoice_Dte, 'W') - TRUNC(I.Invoice_Dte, 'MM')) / 7 + 1
ELSE 0
END;
INSERT INTO InvoiceSummary (Mo, CostCenter, Vendor, VendorName, Section, TimeUnit, Amt)
SELECT
Mo,
CostCenter,
Vendor,
VendorName,
Section,
TimeUnit,
Amt
FROM (
WITH Months AS (
SELECT ADD_MONTHS(Least(ADD_MONTHS(FromDate, -ComparisonMonths), TRUNC(FromDate, 'YYYY')), LEVEL - 1) Mo
FROM DUAL
CONNECT BY LEVEL <= MONTHS_BETWEEN(ToDate, Least(ADD_MONTHS(FromDate, -ComparisonMonths), TRUNC(FromDate, 'YYYY')))
), Sections AS (
SELECT 1 Section, 1 StartUnit, 5 EndUnit FROM DUAL
UNION ALL SELECT 2, 0, ComparisonMonths FROM DUAL
UNION ALL SELECT 3, 1, 1 FROM DUAL WHERE IncludeYTD = 'Y'
), Vals AS (
SELECT LEVEL - 1 TimeUnit
FROM DUAL
CONNECT BY LEVEL <= (SELECT Max(EndUnit) FROM Sections) + 1
), TimeUnits AS (
SELECT S.Section, V.TimeUnit
FROM
Sections S
INNER JOIN Vals V
ON V.TimeUnit BETWEEN S.StartUnit AND S.EndUnit
), Names AS (
SELECT DISTINCT
M.Mo,
Coalesce(I.Vendor, '0') Vendor,
Coalesce(I.CostCenter, ' ') CostCenter
FROM
Months M
LEFT JOIN InvoiceTemp I
ON Least(ADD_MONTHS(M.Mo, -ComparisonMonths), TRUNC(M.Mo, 'YYYY')) <= I.Mo
AND I.Mo <= M.Mo
WHERE
M.Mo >= FromDate
AND M.Mo < ToDate
)
SELECT
N.Mo,
N.CostCenter,
N.Vendor,
Coalesce(V.Vendor_VName, 'No Paid Invoices') VendorName,
T.Section,
T.TimeUnit,
Sum(I.Amt) Amt
FROM
Names N
INNER JOIN APVenMast V ON N.Vendor = V.Vendor
CROSS JOIN TimeUnits T
LEFT JOIN InvoiceTemp I
ON N.CostCenter = I.CostCenter
AND N.Vendor = I.Vendor
AND (
(
T.Section = 1 -- Weeks for current month
AND N.Mo = I.Mo
AND T.TimeUnit = I.WkNum
) OR (
T.Section = 2 -- Summary months
AND ADD_MONTHS(N.Mo, -T.TimeUnit) = I.Mo
) OR (
T.Section = 3 -- YTD
AND I.Mo BETWEEN TRUNC(N.Mo, 'YYYY') AND N.Mo
)
)
WHERE
N.Mo >= FromDate
AND N.Mo < ToDate
AND V.Vendor_Group = '1 '
AND NOT ( -- Only 4 weeks when a month is less than 28 days long
T.Section = 2
AND T.TimeUnit = 5
AND TRUNC(N.Mo + 28, 'MM') <> N.Mo
AND I.CostCenter IS NULL
) AND (
T.Section <> 1
OR IncludeWeekly = 'Y'
)
GROUP BY
N.Mo,
N.CostCenter,
N.Vendor,
V.Vendor_VName,
T.Section,
T.TimeUnit
) X;
COMMIT;
END;
这是一段漫长而痛苦的旅程,但如果我学到了一件事,那就是在没有正确更新统计信息的数据库中工作(即使供应商不关心,我也会考虑让我们的 DBA 添加)关于他们)对于想要在合理的时间内完成任务的人来说可能是一场真正的灾难。
最佳答案
发布查询可能会有所帮助。
您的 DBA 应该能够在名为 v$session 的 View 中识别 session ,并且列 EVENT 和 WAIT_CLASS 应该指示 Oracle 端发生的情况。
他还能够识别 SQL(来自 v$session 的 SQL_ID)并在 SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY_CURSOR(sql_id)) 中使用它来确定计划。
如果是开发/测试实例,如果他(或她)很忙,看看他是否会授予您自己执行此操作的权限。
关于sql-server - 查询在 Oracle SQL Developer 中运行很快,但在 SSRS 2008 R2 中运行缓慢,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4788987/