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Vs. EHCache

and recovery, advanced queries, etc.  - maybe the fastest solution is to use memory-based HashMap with serialization file as a persistence back end. cburnley
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Working with a cleared cache

I'm working on trying to improve the performance of our database processing class and I'm attempting to keep the L1 cache within the PersistenceManager cleared in an effort to reduce its memory footprint. The code snippet below is part of a Callable task that is run repeatedly with a given list
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[ODB1] Chapter 6 - Persistent Objects

Persistent In JDO applications, every object in memory is either a persistent object, i.e. represents some ... is retrieved from the database, its no-arg constructor is used to construct a memory object ... Cache As noted before, persistent objects are memory objects that represent some content in
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[ODB1] Chapter 9 - ObjectDB Explorer

of memory. If you need to run the Explorer with increased available memory, you can use the -Xmx JVM ... , etc.) are stored in memory, associated with the active transaction. The "File | Save" menu command ... stores String instances in the database using the same encoding that they have in memory
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[ODB1] Chapter 2 - A Quick Tour

instances. ObjectDB, as a pure object database, can simply store a memory data structure in ... to be stored physically in the database when the transaction is committed (line 37). Note: Memory objects ... , which is modified in line 29) are automatically stored in the database. Objects in memory
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[ODB1] Chapter 3 - Persistent Classes

of persistent classes that live only in memory) are called transient objects or transient instances ... schema instances. When an old instance is loaded into the memory it is automatically converted into ... . Until then, the conversion is done only in memory each time the object is loaded, and the content
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[ODB1] Chapter 5 - JDO Connections

and are kept in memory until the transaction is ended. If the transaction is ended with rollback ... in memory (they are never propagated to the database). javax.jdo.option.RetainValues Indicates
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[ODB1] Chapter 7 - JDOQL Queries

a collection is less common than querying an Extent. It is useful for filtering a collection in memory
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[ODB1] Chapter 8 - ObjectDB Server

, you can increase the maximum allowed memory and instruct Java to run in server mode in order to enlarge