About performance

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ObjectDB version 2.4.5

Version 2.4.5 Added support of lazy loading of mapped by (inverse) singular relationships (issue #768). Added support for using ObjectDB with TomEE / OpenEJB. Improved loading of eager mapped by (inverse) relationships (issue #769). Improved performance of database file extending. Fixed a bug in
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ObjectDB version 2.4.7

Version 2.4.7 Fixed bugs in cascading merge and refresh. Fixed an internal java.lang.ArrayStoreException bug (com.objectdb.o.InvToOneLoadRequest). Fixed a regression bug (starting 2.4.4_13) in handling embeddable types. Fixed a performance regression (since 2.4.4_01) in query result retrieval
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ObjectDB version 2.5.0

opening and closing. Improved connecting and disconnecting performance when logging is disabled
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ObjectDB version 2.6.2

Version 2.6.2 Added support of entity classes with missing implemented interfaces in the Explorer. Added method com.objectdb.Utilities.newTrackable(em, cls) for improved performance. Added a temporary workaround for NullPointerException on query after flush (issue #1623). Improved title of query
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ObjectDB version 2.6.3

during backup operation). Fixed JOIN FETCH bugs. Fixed a performance issue with mapped by fetch. Fixed
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ObjectDB version 2.6.7

Version 2.6.7 Added an option to write javaagent enhanced classes to file (for diagnosis). Extended temporary files support to update queries (issue #1658). Improved performance of handling multi activations configuration. Fixed a synchronization bug in using temporary files in large transactions
Forum
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500Mb ObjectDb database opening issue

-EventQueue-0): closeDataStore(): Close Pa3 datastore Yes, performance was improved on second opening
Issue
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[ObjectDB 2.2.6_02] Unexpected exception (Error 990) at com.objectdb.o.OBC.aJ(OBC.java:961)

.setEndTime(new GregorianCalendar(2011, 06, 13)); // perform the test try
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Another NPE on em.createQuery(query).getResultList()

classes (you should use enhanced classes anyway to improve performance). Verified and confirming that 2.2.8_01 fixes the issue. kaosko
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ArrayIndexOutOfBoundException

synchronized="true" due to performance reason. I am going to run the stress tests with recommended settings