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ObjectDB version 2.3.0

that leads to memory leak (issue #453). Completed missing documentation (e.g. UPDATE & DELETE queries). Fixed memory leak issues. Fixed server hang and deadlock issues. Fixed several NullPointerException
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ObjectDB version 2.5.6

a NullPointerException in query compilation. Fixed a memory leak (Negative snapshot user count) in UPDATE queries on uncommitted changes (issue #1407). Fixed a memory leak in reflection mode
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ObjectDB version 2.6.4

Version 2.6.4 Added memory only database mode. Added an option to cascade detachment to embedded objects. Added an option to disable reuse of database page objects. Improved release of query resources. Improved memory management in multi flush transactions. Extended detachment of embedded objects
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2.7.3_03 Erroneous "Attempt to modify a primary key of a managed object"

change, and save some space in memory. You can still use StringIdentity to represent object IDs ... StringIdentity id; to @Index private String id; and that might fix the issue, save memory, and not require
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500Mb ObjectDb database opening issue

500Mb ObjectDb database opening issue
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Bulk Delete and Update - best practice?

The attached test creates 1000 large objects and then attempts to delete them all in one go using a DELETE statement. I'm trying to run with -Xmx512m but the test runs out of memory during the delete. The attachment also contains an update test which has similar memory problems. I'm running
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Create simple index for a Id field

operations (see this comparison). But obviously a HashMap in memory is faster than any DBMS for simple ... cache in memory for specific objects if you need the extra performance. But note that your post provides
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Custom Classloader: Issues with the Enhancer Agent

my call to defineClass(), makes the enhancement to the class and loads the modified version in memory ... the modified version in memory first. Not exactly. The enhancer loads the class before enhancement, as
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database optimization

, on the same set of objects.       Memory management in Java is a complex topic and in some cases smaller cache might be slightly more efficient because keeping objects in memory for longer time has some
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Database(*.odb) file size on disk

memory always used by new entities? -Will be the database file automatically reduced?   We have created a small test, in which we create and delete entities. It looks like that the released memory