About cache

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One transaction or two?

) so if you implement such a pool you may gain some performance in some cases (e.g. if the L1 cache is important in ... . Since you are asking about add/remove operations rather than read operation (in which the L1 cache is important
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Optimistic locking: prevent version increment on entity collection attribute

the transaction. - I then clear the EntityManager so I don't have the cached Document and then find ... clear the EntityManager it all works fine because I have the cached value of the Document returned
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Performance Questions...

of the EntityManager's persistence context (L1) cache. But otherwise read only databases are not faster. Future versions of ObjectDB might share an L1 cache of read only entity managers automatically
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Performance with large databases

, the entire database can reside in memory (using the OS cache, regardless of the JVM heap size and the ObjectDB cache size). Except this, ObjectDB performance should not be affected significantly by
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Removing of an entity removes also another entity type

. For example, the  EntityManager may not be aware that a cached entity object in its persistence context ... that a cached entity object in its persistence context has been removed from the database by a DELETE query
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Replaying recorded requests...

" />     cache="64mb" max-threads="10" />     cache results="32mb" programs="500
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Replication failed

" path="." mode="write" /> cache="128mb" max-threads="10" /> cache results="64mb" programs="500" />   
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RT Java application recording into 100DB run OOM after a few hours.

, the default cache size for database pages is 64GB per database, or 6.4GB per 100 databases, so it can easily exceeds your VPS RAM. If you must keep 100 databases open concurrently then you will have to reduce cache sizes, etc. EKK
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Suspected memory leak

, Password: public The screen shots may indicate a problem in the page cache (which keeps too many ... the number of threads and the cache size (notice that this setting is per open database
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Time Sequence Object Command DB

and transactions you can also cache the last state in the database. On restore - this cache will be deleted