Index for attributes with boolean expression

hi
in our project we use a XML database to store our data. we have a lot of searches in the DB in the form
//object\[@class="..." and @module="..."\]
thus i created an index for the attributes class and module (node-attribute-equality-string) to improve the performance. this works really well, but I'm still not satisfied with the results. is there a way to create an index that handles both attributes at once (instead of two indexes).
another problem, occurs after an insert. when i access the data (via a query like the above), then it goes fast. when i insert another node into the database (that does not even has attributes class or module, so it does not interfere with the index) then the same query as before is slower (by a factor of 3 to 5). when i then reindex manually everything is fast again.
btw. we use a node container
greets
Edited by: user11787357 on Aug 13, 2009 4:35 AM

user11787357 wrote:
//object\[@class="..." and @module="..."\]
thus i created an index for the attributes class and module (node-attribute-equality-string) to improve the performance. this works really well, but I'm still not satisfied with the results. is there a way to create an index that handles both attributes at once (instead of two indexes). Add an attribute to your document that combines @class and @module. This @class-module attribute needs a delimiter to seperate the two parts, some string that may not be found in either valuespace. Simply create an index on that attribute. You can use XQuery to update your documents in the database, or maybe XSLT or SAX or BDB XML XmlReader/XmlWriter as a preprocessing step.
another problem, occurs after an insert. when i access the data (via a query like the above), then it goes fast. when i insert another node into the database (that does not even has attributes class or module, so it does not interfere with the index) then the same query as before is slower (by a factor of 3 to 5). when i then reindex manually everything is fast again.
btw. we use a node containerWhich version and patch level? There have been various patches floating about this forum, some of them related to indexing. I've lost track of them. It would be good to see a Consolidated Patch 2 (CP2) for 2.4.16 even though 2.5 seems not too far away.
Michael Ludwig

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2     FUNCTION f1( p IN VARCHAR2 ) RETURN NUMBER;
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4 END pkg;
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2
3     PROCEDURE ins( p1 IN VARCHAR2, p2 IN VARCHAR2 ) IS
4        PRAGMA autonomous_transaction;
5     BEGIN
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9
10     FUNCTION f1( p IN VARCHAR2 ) RETURN NUMBER IS
11     BEGIN
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24                 GROUP BY
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27 END bool_order;
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