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About concurrency

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Pessimistic Lock Timeouts setting

locking due to a highly concurrent system that requires integrity on some value. Rest assured
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Query and commit simultaneously

. To have real concurrent operations, you have to use ObjectDB 2.0 (and not ObjectDB 1.0
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Remove an entity which attributes were changed - OptimisticLockException

a concurrent update by another user (using another EntityManager). According to your description
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Server out of memory exceptions

. How many open databases do you use concurrently? Following the thread dump I count about 9 open
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Transaction isolation support?

the same object by different users concurrently (even for read) you can use explicit locking
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Unable to store AtomicInteger

In the docs, all serializable types should be persistable. However, when I tried to persist a field of type AtomicInteger, I got the following message: Message: Failed to commit transaction: Attempt to store an instance of a non persistable type java.util.concurrent.atomic.AtomicInteger I am using
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Understanding Database max-threads objectdb.conf Settings Option

a semaphore that limits the number of threads that can access the database file concurrently (queuing
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Use temporary files to enable very large transactions

to hold multiple versions for concurrent transactions in order to support MCC. We understand
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using objectdb.jar in writing data to mariadb or mysql db

(see this stackoverflow thread) and can serve 200 or more concurrent connections in client-server mode. kaybel
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Using of ConcurrentHashMap as attribute

Hello, it is possible to use an entity attribute of type java.util.concurrent.ConcurrentHashMap Your web site http://www.objectdb.com/object/db/database/features 'Object Model & Data Types' has no guidelines about this data type. Best regards You can persist a Map field holding a ConcurrentHashMap