Performance question on small XML content but with large volume

Hi all,
I am new to Berkeley XML DB.
I have the following simple XML content:
<s:scxml xmlns:s="http://www.w3.org/2005/07/scxml">
<s:state id="a"/>
<s:state id="b"/>
<s:state id="c"/>
</s:scxml>
about 1.5K bytes each but the total number of such content is large (5 million+ records).
This is a typical query:
query 'count(collection("test.dbxml")/s:scxml/s:state[@id="a"]/following-sibling::s:state[@id="e"])'
where the id attribute is used heavily.
I've tested with about 10000 records with the following indexes:
Index: edge-attribute-equality-string for node {}:id
Index: unique-node-metadata-equality-string for node {http://www.sleepycat.com/2002/dbxml}:name
Index: edge-element-presence-none for node {}:scxml
Index: edge-element-presence-none for node {}:state
but the query took just under one minute to complete. Is this the expected performance? It seems slow. Is there anyway to speed it up?
In addition, the total size of the XML content is about 12M but ~100M of data is generated with the log.xxxxxxxxxx files. Is this expected?
Thanks.

Hi Ron,
Yes, I've noticed the URI issue after sending the post and changed them to:
dbxml> listindex
Default Index: none
Index: edge-attribute-equality-string for node {http://www.w3.org/2005/07/scxml}
:id
Index: unique-node-metadata-equality-string for node {http://www.sleepycat.com/2
002/dbxml}:name
Index: edge-element-presence-none for node {http://www.w3.org/2005/07/scxml}:scx
ml
Index: edge-element-presence-none for node {http://www.w3.org/2005/07/scxml}:sta
te
5 indexes found.
I added more records (total ~30000) but the query still took ~1 minute and 20 seconds to run. Here is the query plan:
dbxml> queryplan 'count(collection("test.dbxml")/s:scxml/s:state[@id="start"]/fo
llowing-sibling::s:state[@id="TryToTransfer"])'
<XQuery>
<Function name="{http://www.w3.org/2005/xpath-functions}:count">
<DocumentOrder>
<DbXmlNav>
<QueryPlanFunction result="collection" container="test.dbxml">
<OQPlan>n(P(edge-element-presence-none,=,root:http://www.sleepycat.com
/2002/dbxml.scxml:http://www.w3.org/2005/07/scxml),P(edge-element-presence-none,
=,scxml:http://www.w3.org/2005/07/scxml.state:http://www.w3.org/2005/07/scxml))<
/OQPlan>
</QueryPlanFunction>
<DbXmlStep axis="child" prefix="s" uri="http://www.w3.org/2005/07/scxml"
name="scxml" nodeType="element"/>
<DbXmlStep axis="child" prefix="s" uri="http://www.w3.org/2005/07/scxml"
name="state" nodeType="element"/>
<DbXmlFilter>
<DbXmlCompare name="equal" join="attribute" name="id" nodeType="attrib
ute">
<Sequence>
<AnyAtomicTypeConstructor value="start" typeuri="http://www.w3.org
/2001/XMLSchema" typename="string"/>
</Sequence>
</DbXmlCompare>
</DbXmlFilter>
<DbXmlStep axis="following-sibling" prefix="s" uri="http://www.w3.org/20
05/07/scxml" name="state" nodeType="element"/>
<DbXmlFilter>
<DbXmlCompare name="equal" join="attribute" name="id" nodeType="attrib
ute">
<Sequence>
<AnyAtomicTypeConstructor value="TryToTransfer" typeuri="http://ww
w.w3.org/2001/XMLSchema" typename="string"/>
</Sequence>
</DbXmlCompare>
</DbXmlFilter>
</DbXmlNav>
</DocumentOrder>
</Function>
</XQuery>
I've noticed the indexes with URI were not used so I added back the indexes without URI:
dbxml> listindex
Default Index: none
Index: edge-attribute-equality-string for node {}:id
Index: edge-attribute-equality-string for node {http://www.w3.org/2005/07/scxml}
:id
Index: unique-node-metadata-equality-string for node {http://www.sleepycat.com/2
002/dbxml}:name
Index: edge-element-presence-none for node {}:scxml
Index: edge-element-presence-none for node {http://www.w3.org/2005/07/scxml}:scx
ml
Index: edge-element-presence-none for node {}:state
Index: edge-element-presence-none for node {http://www.w3.org/2005/07/scxml}:sta
te
8 indexes found.
Here is the query plan with the above indexes:
dbxml> queryplan 'count(collection("test.dbxml")/s:scxml/s:state[@id="start"]/fo
llowing-sibling::s:state[@id="TryToTransfer"])'
<XQuery>
<Function name="{http://www.w3.org/2005/xpath-functions}:count">
<DocumentOrder>
<DbXmlNav>
<QueryPlanFunction result="collection" container="test.dbxml">
<OQPlan>n(P(edge-element-presence-none,=,root:http://www.sleepycat.com
/2002/dbxml.scxml:http://www.w3.org/2005/07/scxml),P(edge-element-presence-none,
=,scxml:http://www.w3.org/2005/07/scxml.state:http://www.w3.org/2005/07/scxml),V
(edge-attribute-equality-string,state:http://www.w3.org/2005/07/scxml.@id,=,'sta
rt'),V(edge-attribute-equality-string,state:http://www.w3.org/2005/07/scxml.@id,
=,'TryToTransfer'))</OQPlan>
</QueryPlanFunction>
<DbXmlStep axis="child" prefix="s" uri="http://www.w3.org/2005/07/scxml"
name="scxml" nodeType="element"/>
<DbXmlStep axis="child" prefix="s" uri="http://www.w3.org/2005/07/scxml"
name="state" nodeType="element"/>
<DbXmlFilter>
<DbXmlCompare name="equal" join="attribute" name="id" nodeType="attrib
ute">
<Sequence>
<AnyAtomicTypeConstructor value="start" typeuri="http://www.w3.org
/2001/XMLSchema" typename="string"/>
</Sequence>
</DbXmlCompare>
</DbXmlFilter>
<DbXmlStep axis="following-sibling" prefix="s" uri="http://www.w3.org/20
05/07/scxml" name="state" nodeType="element"/>
<DbXmlFilter>
<DbXmlCompare name="equal" join="attribute" name="id" nodeType="attrib
ute">
<Sequence>
<AnyAtomicTypeConstructor value="TryToTransfer" typeuri="http://ww
w.w3.org/2001/XMLSchema" typename="string"/>
</Sequence>
</DbXmlCompare>
</DbXmlFilter>
</DbXmlNav>
</DocumentOrder>
</Function>
</XQuery>
The indexes are used in this case and the execution time was reduced to about 40 seconds. I set the namespace with setNamespace when the session is created. Is this the reason why the indexes without URI are used?
Any other performance improvement hints?
Thanks,
Ken

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