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Caching/Paging Questions...

references to such cached result objects ? or do ObjectDB exploits frequency of querying such objects ... size of ObjectDB L2 cache or EntityManager context ? Q4: Would paging result sets ... of the persistence context (the EntityManager L1 cache) but instantiation of the results

cache optimizing

. we wonder if the cache and other settings can be optimized to get the most performance ... version-check="true" /> <!-- cache: 2048mb/8GByte RAM, 4096mb/16GByte RAM, 8192mb above --> <!-- max-threads: number of processor (cores) * 2 --> <processing cache="16384mb" max-threads="8" /> <index

Cache configuration of database file pages, query programs, query results

Are there some possibilities to configure following caches in order to keep cache data for only some important entity types and for the entire life cycle of the EntityManagerFactory. Cache of database file pages. Cache of query programs. Cache of query execution results. btc_es BTC EmbeddedSystems

JPA Level 2 Cache - app config

Hello! I would like to use selective cache for JPA Level 2 (cached in EntityManagerFactory) in one app, but no cache at all in another app. Both will be connected to the same ObjectDB server & db ... #The_cache_element_ specifies only amount of MB used for Level 2 cache, but the config is at server

Compiled Queries and Cache

objectdb.conf has options for query results and program cache. (objectdb.conf > database > query-cache > results and programs, https://www.objectdb.com/java/jpa/setting/database#The_query-cache ... cache still available? CBE CBE Yes, these are server/store side caches. The exact client side code doesn't affect. support Support

Using of Second Level Cache

was load and the entity MyEntity1 is taken in the second level cache, the other entity types not ... BTC EmbeddedSystems The 2nd level cache stores object data (byte[]) rather than live entity objects ... level cache as object IDs (PK) encoded in the byte[] of a MyEntity1 instance. When you retrieve

Working with a cleared cache

attempting to keep the L1 cache within the PersistenceManager cleared in an effort to reduce its memory ... the cache? try { // Start the transaction m_persistenceManager ... the JDO cache m_persistenceManager.evictAll(); m

Database Explorer

of elements. Use the [First] and [Max] fields to set the result range. Check [Disable Cache] to bypass query program and result caches. Click the Execute button to run the query. If the query is valid ... the Cache When a database is open in the Explorer in client server mode, it can be accessed simultaneously

Page cache File handling produced an java.io.IOException: Negative seek offset

Page cache File handling produced an java.io.IOException: Negative seek offset


the PersistenceManager cache with the datastore. Validates the PersistenceManager cache with the datastore ... , this method verifies the consistency of instances in the cache against the datastore. An implementation ... of the instances in the cache against the datastore. If any inconsistencies are detected

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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