Interesting query

[David Zonsheine <Da...@enigma.com>]

> Hello derby-user,
> 
> We installed Derby on our application to be used instead of SQL Server and
> worked very hard to improve the queries.
> The process results were quite good even though we should improve them
> more.
> 
> Now, we have 1 long and complicated query that take 0.04 seconds on SQL
> Server and about 25 seconds on Derby.
> We worked very hard to improve it but couldn't.
> Please take a look at it and see if you have any idea. You'll help us very
> very much if you do.
> If by any chance you want the DB dump itself I'll be very happy to post
> it.
> 
> The query is:
> 
> select distinct TN_RT_TOC.TOC_ID, TN_RT_TOC.NODE_ID,
> TN_RT_TOC.CHILD_INDEX,TN_RT_TOC.PARENT_NODE_ID, 
> TN_RT_TOC.NODE_NAME AS TITLE, TN_RT_TOC.NODE_TYPE AS CLASS, 
> 'Document(docID='|| char(35)|| 'xpointer(id(' || char(36) ||
> TN_RT_TOC.NODE_LINK || char(36) || ')),storage=REPOSITORY)' AS LINK, 
> 'Exact' AS LINKTYPE, 
> 'Document(docID='|| char(35)|| 'xpointer(id(' || char(36) ||
> TN_RT_TOC.NODE_LINK || char(36) || ')),storage=REPOSITORY)' AS SOURCE_ID, 
> TN_RT_TOC.NODE_TYPE AS TYPE, TN_RT_TOC.NODE_ID AS PERSISTENTID, 
> supplement.PROPERTY_VALUE AS NODE_CLASS 
> FROM 
> TN_RT_TOC LEFT JOIN TN_RT_TOC_PROPERTI as supplement ON
> TN_RT_TOC.TOC_ID=supplement.TOC_ID 
> AND TN_RT_TOC.NODE_ID=supplement.NODE_ID AND supplement.PROPERTY_VALUE IN
> ('JOP', 'Bulletin') 
> left join TN_RT_TOC_PROPERTI as effectivity on
> TN_RT_TOC.TOC_ID=effectivity.TOC_ID 
> AND TN_RT_TOC.NODE_ID=effectivity.NODE_ID , TAIL_NUMBERS 
> where 
> TN_RT_TOC.TOC_ID = 'B767' AND PARENT_NODE_ID = 1 
> AND (effectivity.property_name='EFF' OR effectivity.TOC_ID is null) 
> AND TAIL_NUMBERS.TAIL_NUMBER='JA601J' AND
> TAIL_NUMBERS.ATTR_NAME='FLEET_EFF' 
> and TAIL_NUMBERS.ATTR_VALUE>=CASE when effectivity.property_value is not
> NULL 
> then SUBSTR(effectivity.property_value, 1, 3) 
> ELSE '0' END AND TAIL_NUMBERS.ATTR_VALUE<=CASE when
> effectivity.property_value is not NULL 
> then SUBSTR(effectivity.property_value, 4, 3) ELSE '999' END 
> order by TN_RT_TOC.CHILD_INDEX
> Thank you very much!
> David Zonsheine
> Projects Development Manager
> www.enigma.com <www.enigma.com> 
> Cell: 972-54-6658784.
> 
> 
> 
> 
> 
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