About cache

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Forum
31

Cache usage

after a runtime of several weeks we are now analyzing the usage of the cache and so on. Looking at the heap dump we suspect that the cache is really used (see heap dump attached), the RAM allocated ... . The config is attached as well. The question is: is the cache really used ? The heap dump shows usage
Forum
31

Level 2 cache not hit in @ManyToOne

2 JPA cache is activated and it works ok for find by id (tested by changing data in explorer and reading in my app). Problem 1: find by id on Item it's good, it hits the cache, but not for its field ... my app). "user" should also be taken from L2 cache, shouldn't it? Otherwise...it's a huge performance
Forum
30

Is 2 level cache in use?

Hi, Is there any way to check, if 2 level cache is in use? Right now I've done two things: 1. objectdb.conf with cache size is placed in WEB-INF directory of my web application. 2. persistence.xml ... , so most of the data should be in cache. ODB and Tomcat are on different servers. You cannot check
Issue
30

JQL-Update Queries fails with activated L2-Cache

a container the updated Entities. Scenario 1: Disabled L2 Cache, updating elements using UPDATE-Query ... database - Actual result: No changes are visble. Scenario 2: Disabled L2 Cache, updating elements using ... a mystery why ".clear()" has to be called. Scenario 3: Enabled L2 Cache, updating elements using UPDATE
Forum
30

Enforce Second Level cache

that is cached in 2nd level cache. so that if i request that entity again I will get actually ... on this (is it really the same object kept in cache).... Now the problem is that I need to have guarantee that this entity object is kept in cache all the time (there are not many of these entities
Forum
30

How Should I Configure objectdb.conf to Obtain 256KB Disk IO Requests and Maximize Shared PersistenceManager Entity Cache?

to give 256KB disk accesses and use PersistenceManager L1 ref=soft caching and datastore pagefile caching 1 MB (4 256KB sized pages).  The goal is to have frequent PersistenceManager L1 cache hit, then less frequent datastore pagefile cache hit, then when absolutely necessary, read/write from
Forum
30

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 ... (the EntityManager L1 cache) but instantiation of the results (if they contain entity objects
Forum
30

Distributed second level cache

Is it possible to configure the second level cache as distributed? The use-case: The object Person "John" is read on application node 1 and also on application node 2 to the second level caches ... cache on application node 1 has a correct data. The object Person is read from application node 2
Forum
30

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. These caches are fully
Forum
30

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