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ObjectDB version 2.2.8

Version 2.2.8 Fixed a critical bug in extensive removal operations of large objects. Improved the performance of navigation through an inverse (mapped by) field if the owner field is indexed. Fixed a LEFT OUTER JOIN bug. Fixed a bug in parsing queries with parenthesis followed by NOT. Fixed a bug
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ObjectDB version 2.3.7

Version 2.3.7 Fixed a critical issue that may cause database corruption (issue #630). Initial attempt to enable navigation through lazy loading from detached objects (feature request #326). Improved toString of criteria queries to use aliases (issue #127). Fixed automatic variable naming in
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ObjectDB version 2.4.0

very slow query execution when using entity parameters. Fixed issues in navigation through detached objects.
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@OneToOne query issue with OR and IS NULL

WHERE a.another IS NULL OR b.counter = 0 You missed the A instance with no another because navigation
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[Explorer] Executing Queries

The new Explorer of ObjectDB 2 supports retrieval of database objects by classes and navigation. Retrieval of database objects by executing queries visually should also be supported. This is one of the features that have been supported by the old Explorer of ObjectDB 1. It has been temporarily
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[ObjectDB 2.5.5_03] Unexpected exception (Error 990)

overlooked the NULL navigation thing. Sorry. Your suggested query doesn't work but I modified it a little
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com.objectdb.o.InternalException NPE

.objectdb.o.REG.S(REG.java:822) The stack trace indicates navigation through a broken reference
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Composite indexes

also on relations? @OneToOne, @ManyToOne? Yes. They are useful when the query includes navigation between entities (directly or using JOIN).   kborkowski
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How to install ObjectDB on my Amazon EC2?

the ObjectDB archive, then you navigate into "bin" folder of the folder that was created
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Is 2 level cache in use?

, regardless the cache. So the cache is mainly useful for retrieval by find and by navigation (and not