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General Performance Issues Illustrated with a Specific Method

><sub-planning vars="v$1" filter="">     <step vars="()+v$1" future ... -planning vars="c,v$1" filter="and(or((toLower(v$1.nic)=:q),(v$1.phone2=:q),(v$1.phone1=:q),(toLower(v$1 ... " filter="(c.retired=false)">           <filterPlan complexity="3

SELECT clause (JPQL / Criteria API)

%' The only difference between SELECT and SELECT DISTINCT is that the later filters duplicate results. Filtering duplicate results might have some effect on performance, depending on the size

FROM clause (JPQL / Criteria API)

, however, adds support for filtering instances of specific types at the WHERE clause filters any

queries under 2.7.6_4 significantly slower than under 2.7.6

>[Step 2b] Evaluate fields in ObjectNode (v$1) instances. [Step 2c] Filter ... (v$2) instances. [Step 3c] Filter the results of step 3b retaining only results that satisfy:   (v$2.doubleValue!=13). [Step 3d] Filter the results of step 3c

Step 1: Create a Maven Web Project

Next. Enter maven-archetype-webapp as a filter

[ODB1] Chapter 9 - ObjectDB Explorer

the candidate collection of the query. Optional JDOQL components, such as filter, parameters ... elements from the auto completion list when you write the query filter


JDO JavaDoc Reference Documentation -


JDO JavaDoc Reference Documentation - PersistenceManager is the primary interface for JDO-aware application components.


> Execute the query and return the filtered The filter ... expression of the filter. The element passes the filter if there exist unique values for all variables

addSubquery(sub, variableDeclaration, candidateCollectionExpression, parameters)

the candidate class, filter, parameter declarations, variable declarations, imports, ordering ... the filter if not explicitly declared in the subquery.