ObjectDB Database Search

Jakarta Persistence (JPA) Method in jakarta.persistence. Cache void evict (    Class cls ,    Object primaryKey ) Remove the data for the given entity from the cache . Parameters: cls - entity class primaryKey - primary key Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence. Cache void evict (    Class cls ) Remove the data for entities of the specified class (and its subclasses) from the cache . Parameters: cls - entity class Since: Jakarta Persistence (JPA) 1.0

miscellaneous database engine settings: The cache attribute provides a hint for the amount of memory to use for caching database file pages. The max-threads attribute specifies the maximum number ... for the two query cache mechanisms that ObjectDB manages: The results attribute specifies the size

to have my persistent objects be cached until the Java Virtual Machine (JVM) does a full Garbage Collection (GC ... cache .  I disable the L2 cache and use 1 MB for the ObjectDB Datastore page file cache ... , and a soft reference when the byte[] only needs to be read and sits in the cache until more heap RAM

to find() and lock() . Cache retrieve mode Controls whether data is read from the second-level cache : USE or BYPASS . Scope Usage EntityManagerFactory Set the PersistenceConfiguration. CACHE _RETRIEVE_MODE property when you create the EntityManagerFactory , or set "jakarta.persistence. cache .retrieveMode

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 ? hgzwicker Hans-Georg

. Level 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

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. lwalkowski Lukasz Walkowski

.conf 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

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

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 ... and program cache still available?   CBE CBE Yes, these are server/store side caches . The exact client side code doesn't affect. support Support

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

back transactions. Utilities and Caching Access metadata, manage schema, and interact with the second-level cache using these utility types: A utility interface obtained from Persistence . Use it to check ... -level cache . Use it to check if specific entities are cached or to evict data to ensure

we have a customer system with 64 GByte RAM, 16 CPUs on 8 sockets, the fastest possible ssd. we wonder if the cache and other settings can be optimized to get the most performance these are the current settings, please advice what we could optimize            

. This mode can be useful when the shared L2 cache is enabled and entities might already be available in the cache . Setting query hints (Scopes) You can set query hints in the following scopes, from

. The persistence context serves as a cache for retrieved entities. If a requested entity is not in ... the Level 2 (L2) cache , if enabled. JPA then adds the new entity to the persistence context as a managed

, cache usage, or fetch graphs. For details and examples, see the JPA Named Queries section

that is cached in its persistence context. Therefore, using a separate EntityManager for DELETE queries

, when you use parameters, ObjectDB can identify queries with the same query string and use a cached

Persistence (JPA) 1.0 CacheRetrieveMode getCacheRetrieveMode () The cache retrieval mode that will be in ... getCacheStoreMode () The cache storage mode that will be in effect during query execution ... cacheRetrieveMode ) Set the cache retrieval mode that is in effect during query execution. This cache

of the persistence context (or first-level cache ) with the second-level cache , if any, may be controlled by ... transaction. Since: Jakarta Persistence (JPA) 1.0 CacheRetrieveMode getCacheRetrieveMode () The cache ... getCacheStoreMode () The cache storage mode for this persistence context. Since: Jakarta Persistence (JPA

, an instance of Cache , allowing direct programmatic control over the second-level cache ... Persistence (JPA) 2.1 Cache getCache () Access the cache that is associated with the entity manager factory (the "second level cache "). Returns: an instance of Cache , or null if there is no second

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

files access and only part of the virtual file is in the virtual server's cache . Have you ever heard ... and only part of the virtual file is in the virtual server's cache . Have you ever heard ... caching of the database file is the reason seems reasonable and maybe this could be solved

manager A couple of questions about this: 1. the first evictAll() seems to be clearing the L2 cache ... is a bit tricky. pmf.getDataStoreCache().evictAll() clears the L2 cache . pm.evictAll() clears the persistence manager (L1) cache . But evictAll does not affect objects that have been changed by the current

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

Jakarta Persistence (JPA) Method in jakarta.persistence.EntityManagerFactory Cache getCache() Access the cache that is associated with the entity manager factory (the "second level cache "). Returns: an instance of Cache , or null if there is no second-level cache in use. Throws

stored in memory that assists in searching on indexes?  Are they cached in any way? Here's a bit ... ;  ObjectDB version 2.37_22. Thanks in advance. cvtsc Dev Team There is no special cache for indexes. Pages that contain indexes are cached in the page cache , exactly as pages that contain data. Try

(    CacheRetrieveMode cacheRetrieveMode ) Set the cache retrieval mode that is in effect during query execution. This cache retrieval mode overrides the cache retrieve mode in use by the entity manager. Parameters: cacheRetrieveMode - cache retrieval mode Returns: the same query instance. Since: Jakarta Persistence (JPA) 3.2

(    CacheStoreMode cacheStoreMode ) Set the cache storage mode that is in effect during query execution. This cache storage mode overrides the cache storage mode in use by the entity manager. Parameters: cacheStoreMode - cache storage mode Returns: the same query instance. Since: Jakarta Persistence (JPA) 3.2

setCacheRetrieveMode (    CacheRetrieveMode cacheRetrieveMode ) Set the cache retrieval mode that is in effect during query execution. This cache retrieval mode overrides the cache retrieve mode in use by the entity manager. Parameters: cacheRetrieveMode - cache retrieval mode Returns

setCacheStoreMode (    CacheStoreMode cacheStoreMode ) Set the cache storage mode that is in effect during query execution. This cache storage mode overrides the cache storage mode in use by the entity manager. Parameters: cacheStoreMode - cache storage mode Returns: the same query instance. Since: Jakarta Persistence (JPA) 3.2

Jakarta Persistence (JPA) Method in jakarta.persistence.PersistenceConfiguration PersistenceConfiguration sharedCacheMode (    SharedCacheMode sharedCacheMode ) Specify the shared cache mode for the persistence unit. Parameters: sharedCacheMode - the shared cache mode Returns: this configuration. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.PersistenceConfiguration SharedCacheMode sharedCacheMode() The shared cache mode. The default behavior is unspecified and provider-specific . Returns: the shared cache mode. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Enum Constant in jakarta.persistence.CacheStoreMode USE Insert entity data into cache when read from database and insert/update entity data when written to the database: this is the default behavior. Does not force refresh of already cached items when reading from database. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Enum Constant in jakarta.persistence.CacheStoreMode REFRESH Insert/update entity data held in the cache when read from the database and when written to the database. Force refresh of cache for items read from database. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.EntityManager void setCacheRetrieveMode (    CacheRetrieveMode cacheRetrieveMode ) Set the default cache retrieval mode for this persistence context. Parameters: cacheRetrieveMode - cache retrieval mode Since: Jakarta Persistence (JPA) 3.2

Jakarta Persistence (JPA) Method in jakarta.persistence.EntityManager void setCacheStoreMode (    CacheStoreMode cacheStoreMode ) Set the default cache storage mode for this persistence context. Parameters: cacheStoreMode - cache storage mode Since: Jakarta Persistence (JPA) 3.2

Jakarta Persistence (JPA) Interface jakarta.persistence.FindOption An option influencing the behavior of EntityManager.find . Built-in options control locking , cache interaction , and timeouts . This interface may be implemented by custom provider-specific options which extend the options defined

Jakarta Persistence (JPA) Method in jakarta.persistence.PersistenceConfiguration PersistenceConfiguration validationMode (    ValidationMode validationMode ) Specify the validation mode for the persistence unit. Parameters: validationMode - the shared cache mode Returns: this configuration. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Enum Constant in jakarta.persistence.CacheRetrieveMode USE Read entity data from the cache : this is the default behavior. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Enum Constant in jakarta.persistence.CacheRetrieveMode BYPASS Bypass the cache : get data directly from the database. Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Enum Constant in jakarta.persistence.CacheStoreMode BYPASS Don't insert into cache . Since: Jakarta Persistence (JPA) 1.0

Jakarta Persistence (JPA) Method in jakarta.persistence.EntityManager CacheRetrieveMode getCacheRetrieveMode() The cache retrieval mode for this persistence context. Since: Jakarta Persistence (JPA) 3.2

Jakarta Persistence (JPA) Method in jakarta.persistence.EntityManager CacheStoreMode getCacheStoreMode() The cache storage mode for this persistence context. Since: Jakarta Persistence (JPA) 3.2

:591) at com.objectdb.jpa.EMImpl.find(EMImpl.java:514) at com.ysoft. cache .objectdb.ObjectCacheDB.deleteInOpenTransaction(ObjectCacheDB.java:361) at com.ysoft. cache .objectdb.ObjectCacheDB.delete(ObjectCacheDB.java:356) at com.ysoft. cache .objectdb.ObjectCacheDB.delete(ObjectCacheDB.java:347) at eu.ysoft

of field field eu.ysoft.safeq.core. cache .entity.CacheableJobStat.jais using enhanced method at com ... .core. cache .entity.CacheableJobStat.__odbGet_jobId(CacheableJobStat.java:1) at eu.ysoft.safeq.core. cache .entity.CacheableJobStat.toString(CacheableJobStat.java:136) at java.lang.String.valueOf(Unknown

infrastructure ( cache releated classes? ) that was built up during reading and now ... should be better done inside the DB if possible. btc_es BTC EmbeddedSystems ObjectDB manages several cache data structures: Page cache Query caches Entity caches You may use the above links to the see default

due to increasing page cache  size. I see that the test uses 4 different databases (2 large and 2 small). The default size of each page cache (per database) is 64MB, so the cache of the two large databases consumes at least 128MB (probably a little more). Other caches (page caches of the 2 other databases

is related to dilution of pages from the page cache when it becomes too loaded, but the reason ... traces may indicate an infinite loop in purging pages from the cache , i.e. #1 and #3 indeed reflect ... of cached pages contains a circle since there are no other apparent reasons. With no test case