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General Performance Issues Illustrated with a Specific Method

> </newQueryResponse> ="0.00/0.00" variable="v$1(Person)" binding="bound(c.person)" /> ... ="true">       <btreePlan complexity="12.4799" eval="3.70/6.30" variable="v ... ="12.5432" eval="3.72/6.30" variable="v$1(Person)" scope="index(-119[all])" />    

OutOfMemoryError in a query with many variables

. Can you post the query? Does it have a large number of variables (> 20 ... handle well queries with a lot of variables, and complex navigation (e.g. $1 ... variables. This should be improved in future versions. support Support Build 2.3

DELETE Queries in JPA/JPQL

Country       // no variable DELETE FROM Country c     // an optional variable DELETE FROM Country AS c  // AS + an optional variable ... to the structure of SELECT queries. DELETE queries cannot include multiple variables and JOIN

UPDATE SET Queries in JPA/JPQL

variable (with or without an explicit variable name) for iteration. Multiple variables and JOIN are not ... variable name - if defined). Multiple field update expressions, separated by commas

ORDER BY clause (JPQL / Criteria API)

ORDER BY currency, name Alias variables are referred to as result variables to distinguish them from the identification variables that are defined in the orderBy method takes a variable number of 

GROUP BY and HAVING clauses

. Only identification variables and path expressions are currently ... /groupBy_Expression__">groupBy method takes a variable number of arguments specifying ... >having form takes a variable number of

SELECT clause (JPQL / Criteria API)

directly, but their content can be added to the SELECT clause by using a bound JOIN variable in the multiselect, which takes a variable number of arguments representing multiple

JPA Persistable Types

>final methods or final instance variables. ObjectDB ... classes are forbidden). Instance (non static) variables cannot be final, but classes

JPA Criteria API Queries

variable in the FROM clause. Finally, the range variable, c, is also used in the SELECT

javax.jdo.Query

, variable declarations, import statements, ordering and grouping specifications, result and result class ... corresponds to local variables of a method setFilter and variables