Prepared XmlQueryExpression with variables vs String query

John,
I have ran into another performance problem. This time it is the same xpath expression. The difference is one is a prepared one with variables that are being reset for each execution thread where as the other one is alway a new string query with each execution thread.
dbxml> info
Version: Oracle: Berkeley DB XML 2.3.10: (January 30, 2007)
Berkeley DB 4.5.20: (September 20, 2006)
Default container name: en-US
Type of default container: NodeContainer
Index Nodes: on
Shell and XmlManager state:
Verbose: on
Query context state: LiveValues,Eager
declare default element namespace "http://dto.destination.dbxml.valhalla.starwood.com";
collection("en-US")/City[CityDetail/PropertyIds/PropertyId=100]/CityItems/CityItem[@CityItemId=(actual collection of 500 double values)]
Time: 498 ms
vs
declare default element namespace "http://dto.destination.dbxml.valhalla.starwood.com"; collection("en-US")/City[CityDetail/PropertyIds/PropertyId=$PropertyId]/CityItems/CityItem[@CityItemId=$Ids]
Time: 104291 ms
A snippet of query plans is following:
dbxml> queryplan 'declare default element namespace "http://dto.destination.dbxml.valhalla.starwood.com";
collection("en-US")/City[CityDetail/PropertyIds/PropertyId=100]/CityItems/CityItem[@CityItemId=(196970,339036)]'
<XQuery>
<DbXmlNav>
<LookupIndex container="en-US">
<ValueQP index="node-element-equality-double" operation="eq" child="PropertyId:http://dto.destination.dbxml.valhalla.starwood.com"
value="100"/>
</LookupIndex>
<DbXmlStep axis="parent-of-child" uri="http://dto.destination.dbxml.valhalla.starwood.com" name="PropertyIds" nodeType="element"/>
<DbXmlStep axis="parent-of-child" uri="http://dto.destination.dbxml.valhalla.starwood.com" name="CityDetail" nodeType="element">
<OQPlan>P(node-element-presence-none,=,CityDetail:http://dto.destination.dbxml.valhalla.starwood.com)</OQPlan>
</DbXmlStep>
<Join type="parent-of-child" return="argument">
<DbXmlNav>
<QueryPlanFunction result="collection" container="en-US">
<OQPlan>n(P(node-element-presence-none,=,CityDetail:http://dto.destination.dbxml.valhalla.starwood.com),V(node-element-equality-double,P
ropertyId:http://dto.destination.dbxml.valhalla.starwood.com,=,'100'),u(n(P(node-element-presence-none,=,CityItem:http://dto.destination
.dbxml.valhalla.starwood.com),V(node-attribute-equality-double,@CityItemId,=,'196970')),n(V(node-attribute-equality-double,@CityItemId,=
,'339036'),P(node-element-presence-none,=,CityItem:http://dto.destination.dbxml.valhalla.starwood.com))))</OQPlan>
</QueryPlanFunction>
<DbXmlStep axis="child" uri="http://dto.destination.dbxml.valhalla.starwood.com" name="City" nodeType="element"/>
</DbXmlNav>
</Join>
<DbXmlStep axis="child" uri="http://dto.destination.dbxml.valhalla.starwood.com" name="CityItems" nodeType="element"/>
<DbXmlStep axis="child" uri="http://dto.destination.dbxml.valhalla.starwood.com" name="CityItem" nodeType="element">
<OQPlan>P(node-element-presence-none,=,CityItem:http://dto.destination.dbxml.valhalla.starwood.com)</OQPlan>
</DbXmlStep>
<Join type="attribute" return="context_item">
<LookupIndex container="en-US">
<UnionQP>
<ValueQP index="node-attribute-equality-double" operation="eq" child="CityItemId" value="196970"/>
<ValueQP index="node-attribute-equality-double" operation="eq" child="CityItemId" value="339036"/>
</UnionQP>
</LookupIndex>
</Join>
</DbXmlNav>
</XQuery>
<XQuery>
<DbXmlNav>
<LookupIndex container="en-US">
<ValueQP index="node-element-equality-double" operation="eq"
child="PropertyId:http://dto.destination.dbxml.valhalla.starwood.com">
<Variable name="PropertyId"/>
</ValueQP>
</LookupIndex>
<DbXmlStep axis="parent-of-child" uri="http://dto.destination.dbxml.valhalla.starwood.com" name="PropertyIds" nodeType="element"/>
<DbXmlStep axis="parent-of-child" uri="http://dto.destination.dbxml.valhalla.starwood.com" name="CityDetail" nodeType="element">
<OQPlan>P(node-element-presence-none,=,CityDetail:http://dto.destination.dbxml.valhalla.starwood.com)</OQPlan>
</DbXmlStep>
<Join type="parent-of-child" return="argument">
<DbXmlNav>
<QueryPlanFunction result="collection" container="en-US">
<OQPlan>n(P(node-element-presence-none,=,CityDetail:http://dto.destination.dbxml.valhalla.starwood.com),P(node-element-presence-none,=,C
ityItem:http://dto.destination.dbxml.valhalla.starwood.com),P(node-attribute-equality-double,prefix,@CityItemId),P(node-element-presence
-none,=,PropertyId:http://dto.destination.dbxml.valhalla.starwood.com))</OQPlan>
</QueryPlanFunction>
<DbXmlStep axis="child" uri="http://dto.destination.dbxml.valhalla.starwood.com" name="City" nodeType="element"/>
</DbXmlNav>
</Join>
<DbXmlStep axis="child" uri="http://dto.destination.dbxml.valhalla.starwood.com" name="CityItems" nodeType="element"/>
<DbXmlStep axis="child" uri="http://dto.destination.dbxml.valhalla.starwood.com" name="CityItem" nodeType="element">
<OQPlan>P(node-element-presence-none,=,CityItem:http://dto.destination.dbxml.valhalla.starwood.com)</OQPlan>
</DbXmlStep>
<Join type="attribute" return="context_item">
<DbXmlNav>
<LookupIndex container="en-US">
<PresenceQP index="node-attribute-equality-double" operation="prefix" child="CityItemId"/>
</LookupIndex>
<DbXmlCompare name="equal" join="self">
<Variable name="Ids"/>
</DbXmlCompare>
</DbXmlNav>
</Join>
</DbXmlNav>
</XQuery>
Any ideas of what is going on?
Thanks,
Dmitriy

Dmitriy,
Do you have patch #4 for 2.3.10 applied?
http://www.oracle.com/technology/products/berkeley-db/xml/update/2.3.10/patch.2.3.10.html
Regards,
George

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                                   INNER JOIN [dbo].[OITM] B ON A.ITEMCODE = B.ITEMCODE
                                   INNER JOIN [dbo].[OWHT] C ON B.ITEMCODE = C.U_TGV_CODE_ITEM
                                   WHERE U_TGV_PERCEP_FLAG = 1 AND U_TGV_PERC_TYPE = 1
                                   group by A.DOCENTRY) AA ON AA.DOCENTRY = A.DOCENTRY
LEFT JOIN (SELECT A.DOCENTRY, SUM(A.LINETOTAL) AS TOTAL FROM [dbo].[PCH1] A
                                   INNER JOIN [dbo].[OITM] B ON A.ITEMCODE = B.ITEMCODE
                                   INNER JOIN [dbo].[OWHT] C ON B.ITEMCODE = C.U_TGV_CODE_ITEM
                                   WHERE U_TGV_PERCEP_FLAG = 1 AND U_TGV_PERC_TYPE = 2
                                   group by A.DOCENTRY) BB ON BB.DOCENTRY = A.DOCENTRY
INNER JOIN [dbo].[OITM] I on b.ItemCode = I.ItemCode
Where I.U_TGV_PERCEP_FLAG = 0
group by b.taxcode
UNION ALL
SELECT
'' AS C1,
'' AS C2,
'' AS C3,
'' AS C4,
'' AS C5,
'' AS C6,
round(sum(case when b.vatprcnt = 0 then b.linetotal else 0 end), 4) as NOGRAVEXCENTO,
round(sum(case when b.vatprcnt <> 0 then b.linetotal else 0 end),4) as IMPGRAVADO,
max(b.vatprcnt) as ALICUOTA,
round(sum(b.vatsum),4) as IVA,
round(sum(case when a.U_TGV_TVAT_POS_BP = 'EX' then b.linetotal else 0 end),4) as OPEXENTA,
max(round(ISNULL(AA.TOTAL, 0),4)) AS PERCIVA,
max(round(ISNULL(BB.TOTAL, 0),4)) AS PERCIIBB,
'2' AS CONSULTA
FROM [dbo].[ORPC] A
INNER JOIN RPC1 AS B ON A.DOCENTRY = B.DOCENTRY
LEFT JOIN (SELECT A.DOCENTRY, SUM(A.LINETOTAL) AS TOTAL FROM [dbo].[PCH1] A
                                   INNER JOIN [dbo].[OITM] B ON A.ITEMCODE = B.ITEMCODE
                                   INNER JOIN [dbo].[OWHT] C ON B.ITEMCODE = C.U_TGV_CODE_ITEM
                                   WHERE U_TGV_PERCEP_FLAG = 1 AND U_TGV_PERC_TYPE = 1
                                   group by A.DOCENTRY) AA ON AA.DOCENTRY = A.DOCENTRY
LEFT JOIN (SELECT A.DOCENTRY, SUM(A.LINETOTAL) AS TOTAL FROM [dbo].[PCH1] A
                                   INNER JOIN [dbo].[OITM] B ON A.ITEMCODE = B.ITEMCODE
                                   INNER JOIN [dbo].[OWHT] C ON B.ITEMCODE = C.U_TGV_CODE_ITEM
                                   WHERE U_TGV_PERCEP_FLAG = 1 AND U_TGV_PERC_TYPE = 2
                                   group by A.DOCENTRY) BB ON BB.DOCENTRY = A.DOCENTRY
INNER JOIN [dbo].[OITM] I on b.ItemCode = I.ItemCode
Where I.U_TGV_PERCEP_FLAG = 0
group by b.taxcode
) TOT
group by TOT.ALICUOTA) TOTGEN
where TOTGEN.FECHA between @fdesde and @fhasta
order by TOTGEN.fecha

Hi Roberto,
Try the following:
DECLARE @cnt AS SMALLINT, @DateFrom AS DATETIME , @DateTo AS DATETIME
SELECT @cnt = count(*) FROM [dbo].[OINV] T0 WHERE T0.DocDate = '[%0]'
SELECT @cnt = count(*) FROM [dbo].[OINV] T1 WHERE T1.DocDate = '[%1]'
SET @DateFrom = '[%0]'
SET @DateTo = '[%1]'
IF @DateTo = '1900-01-01'
BEGIN
SET @DateTo = '2999-12-31'
END
SELECT DocNum, DocDate, CardCode, DocTotal
FROM dbo.[OINV]
WHERE DocDate >= @DateFrom AND DocDate <= @DateTo
ORDER BY DocNum
FOR BROWSE
The @cnt variable is only used as a mechanism to get the user values into the SAP parameter variables, which are then assigned to @DateFrom and @DateTo.
If the user does not enter any parameter values then SAP automatically assigns a value of '1900-01-01', which is fine for DateFrom but not DateTo - so if @DateTo equals this then I assign some future date so all transactions should be returned.
Hope this helps.
Regards,
Andrew.

Performance issue doing a prepare statement with LIKE

Hi
I'm doing a preparestatement like this
select foo
from bar
where des like ?
and then do the prepare with the string 'foo%'
If I do the prepare of this variable, the query is very slow. If I don't do the prepare, the query is very fast. Can anyone help me out on this? DBA's will kill me if I don't use prepare statements but users will kill be if the query is slow...
Thank you!
HappyGuy

As indicated in the last reply this probably has to do with use of string literals over bound variables
With a prepared statement the optimiser dosen't get the chance to use histograms against your data... so whilst it might be more efficent to drive off an index for some of the searches it looses access to the data (histograms) that enable it to make this decission...
Hints are probably the way to go... if your sure that driving off a index is always going to be the most efficent...
Using explain (inside of JDeveloper9i or turning on the autotrace functionality inside of sqlplus) will give you some idea of how Oracle would drive the query if you use a string literal
Dom

Problem with variables in formulas when using CrystalReportViewer

Post Author: Aksu
CA Forum: Formula
Hi! I have a problem with variables in Crystal Reports formulas, when using CrystalDecisions.Windows.Forms.CrystalReportViewer class from VS2005-project. ReportViewer always gives error:*************Crystal Report Windows Forms ViewerThis field name is not known.Details: errorKindError in File C:\{dir]}\{file}.rpt:Error in formula <mCustomerAttributes>.'Dim result As String'This field name is not known.Details: errorKind ************* Report without variables works fine with Viewer and in Crystal Reports Designer report with variables works also fine. I have tried with both "formula-syntaxes" - basic and crystal. But Viewer always gives error when trying to define new variable.I think the problem might be with CR -versions, because VS-project has formerly been designed to VS2003 and CR9 or 10. Now I'm using VS2005 and CR11. Though I have changed all references to new CrystalDecisions-asseblies (Ver.11.0.3300.0), when I debug the project and checkout the Viewers ReportSources FormatEngine Shows version CR9_2.... I have no idea where it gets this version...***************DEBUG-view when Viewer is created *******************CrystalReportViewer |_ ReportSourceClassFactoryName ... , Version=11.0.3300.0 , ... |_ ReportSource |_ FormatEngine {CrystalDecisions.CrystalReports.Engine.FormatEngine} |_ ClientVersionHeader {CrystalDecisions.Shared.ReportServiceVersionHeader} |_ | version = 920 (int) |_ Static members |_ VER_CR9 = 920 (int)**************************************** Could anyone have any answers or tips for this problem? I'd really appreciate it... ---Aksu

Has anyone been able to answer this question?
I am having the same problem:
I am designing a report in Crystal Reports XI Developer that contains parameters, which are passed to a stored procedure and are also used within formulas ( in Crystal Syntax ie. {?FORMAT_ID} ) in the report itself.
I can run the report successfully in CRXI Developer. The formulas use the correct values from the parameters entered during execution and everything looks good.
I then deploy the report to Business Objects Enterprise XI. I do all of the things necessary to manage the report including setting up the proper database connection information and default parameter values.
When I run the report using the Crystal Report Viewer, I get the following error message:
Error in File Forecasting.rpt:
Error in formula <Report Format>.
'if (not isNull({?FORMAT_ID} ) ) then
This field name is not known.
Details: errorKind
This happens when I press the "Preview" button in the Manage Object dialog from Crystal or when I run the report using InfoView.
I have changed the formulas and it doesn't seem to matter what the specific content of the formula is; other than the existence of a parameter reference in the formula. If I comment out the parameter and replace it with a hard-coded value, it gets through the formula fine.
Does Business Objects Enterprise XI support crystal reports with parameter references in the formulas?
Thanks,
Tim H.
Edited by: Tim Haley on Nov 25, 2008 11:11 PM
Edited by: Tim Haley on Nov 25, 2008 11:12 PM

Need some clarification on Replacement Path with Variable

Hello Experts,
Need some clarification on Replacement Path with Variable.
We have 2 options with replacement path for characteristic variables i.e.
1) Replace with query
2) Replace with variable.
Now, when we use "Replace with variable" we give the variable name. Then we get a list for "Replace with" as follows:
1) Key
2) External Characteristic Value Key
3)Label
4)Attribute value.
I need detailed explanation for the above mentioned 4 options with scenarios.
Thanks in advance.
Regards
Lavanya

Hi Lavanya,
Please go through the below link.
http://help.sap.com/saphelp_nw70/helpdata/EN/a4/1be541f321c717e10000000a155106/frameset.htm
Hope this gives you complete and detailed explaination.
Regards,
Reddy

Prepared XmlQueryExpression with variables vs String query

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