XQuery Performance in BerkeleyDB More options

We are migrating from IPedo to Berkeley DB.
IPedo did not support multiple indices in their Xqueries, so we had to
concatenate some fields in to one field and index that field, the
Xqueries were really fast.
Unfortunately the same XQuery does not perform well in BerkeleyDB.
This is how we create the index for this filed (ContentKey) in
BerkeleyDB
addIndex '' 'ContentKey' edge-element-equality-string
and this is how I query using Java API.
queryContext.setEvaluationType(XmlQueryContext.Eager);
queryContext.setVariableValue("ContentKey", new XmlValue(
"a0a0188000001115348efcc00000003XXXXXXXXXXXXXYYYYYYYYYYYYYY"));
// Declare the query string
String myQuery = "collection('db/title')/Record[ContentKey=
$ContentKey]";
// Prepare (compile) the query
XmlQueryExpression xmlQueryExpression =
dbManager.prepare(myQuery,queryContext);
1. What is wrong with the index or the way I am using the Java API ?
Changing the evaluation type to Lazy did not help at all.
2. The Query performs OK in dbxml.
3. Are there any other commercial/open source tools to evaluate the
performance of a Xquery in BerkeleyDB? Stylus Studio does not support
BDB - 2.3.10 yet.
Any help would be appreciated.
Thanks,
Suresh

Hi,
I'm sorry, you're in the wrong forum. Please post to the Berkeley DB XML forum:
Berkeley DB XML
Thanks,
Mark

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XQuery Performance in BerkeleyDB

We are migrating from IPedo to Berkeley DB.
IPedo did not support multiple indices in their Xqueries, so we had to
concatenate some fields in to one field and index that field, the
Xqueries were really fast.
Unfortunately the same XQuery does not perform well in BerkeleyDB.
This is how we create the index for this filed (ContentKey) in
BerkeleyDB
addIndex '' 'ContentKey' edge-element-equality-string
and this is how I query using Java API.
queryContext.setEvaluationType(XmlQueryContext.Eager);
queryContext.setVariableValue("ContentKey", new XmlValue(
"a0a0188000001115348efcc00000003XXXXXXXXXXXXXYYYYYYYYYYYYYY"));
// Declare the query string
String myQuery = "collection('db/title')/Record[ContentKey=
$ContentKey]";
// Prepare (compile) the query
XmlQueryExpression xmlQueryExpression =
dbManager.prepare(myQuery,queryContext);
1. What is wrong with the index or the way I am using the Java API ?
Changing the evaluation type to Lazy did not help at all.
2. The Query performs OK in dbxml.
3. Are there any other commercial/open source tools to evaluate the
performance of a Xquery in BerkeleyDB? Stylus Studio does not support
BDB - 2.3.10 yet.
Any help would be appreciated.
Thanks,
Suresh

Hi John:
Thanks for your mail.
I did declare variable as xs:string external, it did not work. I heard from other engineers in the group that since 2.3.8, “external” variables in BerkeleyDB stopped working. We are using 2.3.10.
I also noticed that the query plan when we using external variables is not valid XML (<GlobalVar name="var external="true">). I hope this is just a toString() issue and nothing major.
I have attached the query plans; I do not see anything different between the two. I would really appreciate your help on this.
Thanks,
Suresh
Here are the query plans:
Query that executes in 2 ms (which has the hard coded value):
Query:
String myQuery = "declare namespace tf = \"http://aplaud.com/ns/0.1/tts/format\";" +
"count (collection('db/title')/Record[ContentKey=\"a0a0188000001115348efcc00000003http://daxweb.org/ns/1.0/taxonomy/Product Type/Gift Receipt\"]/tf:TitleDocument/tf:Title/Content/Detail/GiftInfo/Gift)";
Query Plan:
<XQuery>
<Function name="{http://www.w3.org/2005/xpath-functions}:count">
<DocumentOrder>
<DbXmlNav>
<LookupIndex container="db/title">
<ValueQP index="edge-element-equality-string" operation="eq" parent="Record" child="ContentKey" value="a0a0188000001115348efcc00000003http://daxweb.org/ns/1.0/taxonomy/Product Type/Gift Receipt"/>
</LookupIndex>
<Join type="parent-of-child" return="argument">
<DbXmlNav>
<QueryPlanFunction result="collection" container="db/title">
<OQPlan>V(edge-element-equality-string,Record.ContentKey,=,'a0a0188000001115348efcc00000003http://daxweb.org/ns/1.0/taxonomy/Product Type/Gift Receipt')</OQPlan>
</QueryPlanFunction>
<DbXmlStep axis="child" name="Record" nodeType="element"/>
</DbXmlNav>
</Join>
<DbXmlStep axis="child" prefix="tf" uri="http://aplaud.com/ns/0.1/tts/format" name="TitleDocument" nodeType="element"/>
<DbXmlStep axis="child" prefix="tf" uri="http://aplaud.com/ns/0.1/tts/format" name="Title" nodeType="element"/>
<DbXmlStep axis="child" name="Content" nodeType="element"/>
<DbXmlStep axis="child" name="Detail" nodeType="element"/>
<DbXmlStep axis="child" name="GiftInfo" nodeType="element"/>
<DbXmlStep axis="child" name="Gift" nodeType="element"/>
</DbXmlNav>
</DocumentOrder>
</Function>
</XQuery>
Query that executes takes 4 seconds (which has the declared var as xs:string external):
Query:
String myQuery = "declare namespace tf = \"http://aplaud.com/ns/0.1/tts/format\"; declare variable $var as xs:string external;" + "count (collection('db/title')/Record[ContentKey=$var]/tf:TitleDocument/tf:Title/Content/Detail/GiftInfo/Gift)";
Query Plan:
<XQuery>
<GlobalVar name="var external="true">
<SequenceType occurrence="exactly_one" testType="atomic-type" type="http://www.w3.org/2001/XMLSchema:string"/>
</GlobalVar>
<Function name="{http://www.w3.org/2005/xpath-functions}:count">
<DocumentOrder>
<DbXmlNav>
<LookupIndex container="db/title">
<ValueQP index="edge-element-equality-string" operation="eq" parent="Record" child="ContentKey">
<Variable name="var"/>
</ValueQP>
</LookupIndex>
<Join type="parent-of-child" return="argument">
<DbXmlNav>
<QueryPlanFunction result="collection" container="db/title">
<OQPlan>P(edge-element-equality-string,prefix,Record.ContentKey)</OQPlan>
</QueryPlanFunction>
<DbXmlStep axis="child" name="Record" nodeType="element"/>
</DbXmlNav>
</Join>
<DbXmlStep axis="child" prefix="tf" uri="http://aplaud.com/ns/0.1/tts/format" name="TitleDocument" nodeType="element"/>
<DbXmlStep axis="child" prefix="tf" uri="http://aplaud.com/ns/0.1/tts/format" name="Title" nodeType="element"/>
<DbXmlStep axis="child" name="Content" nodeType="element"/>
<DbXmlStep axis="child" name="Detail" nodeType="element"/>
<DbXmlStep axis="child" name="GiftInfo" nodeType="element"/>
<DbXmlStep axis="child" name="Gift" nodeType="element"/>
</DbXmlNav>
</DocumentOrder>
</Function>
</XQuery>

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XQuery Performance in BerkeleyDB More options

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