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context is one  EntityManager . This section describes a level 2  ( L2 ) cache of entity ... ; EntityManager instances.  In addition to the EntityManager 's L1 cache and the EntityManagerFactory 's L2 ... client machines. Setting the Shared Cache The shared ( L2 ) cache is configured in three scopes: Globally

Predicate l1 = cb. like (path, param); Predicate l2 = cb. like (path, "a%"); Predicate l3 = cb. notLike ... ]) Expression l1 = cb. locate (path, param); Expression l2 = cb. locate (path, "x"); Expression l3 = cb

). This could be useful when the shared L2 cache is enabled and entity objects may already be available in the cache

with data that is retrieved from the database (or from the L2 cache - if enabled). The new entity object

(per EntityManager). L2 shared entity data cache  (per EntityManagerFactory). Database file page cache

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

my app). "user" should also be taken from L2 cache, shouldn't it? Otherwise...it's a huge ... . Shouldn't just 6 and 7 be returned fresh (the first time, then loaded from L2 Cache each time)? I ... Chirac The purpose of the L2 cache is to improve performance mainly by minimizing client server round

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 ... of the L1 versus L2 cache?  I presume L1 is only maintained for a transaction whereas L2

it??   dmoshal David Moshal You can disable the L2 cache (or empty it with evict ) and empty ... from L2 cache ? b) If process B attempts to modify object after it is retrieved by process A, does ... ) Is there no way to automatically refresh objects in the L2 cache?     dmoshal David Moshal so far

You cannot check if the L2 cache is enabled directly but you can check its content , by using emf ... and then check if it is cached. The L2 cache doesn't always improve performance. It depends on the application. Sometimes enabling the L2 cache may slow the application because of the overhead in keeping

;Guest tst = new Guest("testname");     Guest l2 = new Guest("level 2");     tst.addGuest( l2 );     Guest l3 = new Guest("level 3");      l2 .addGuest(l3);     hld.getGuests().add(tst);    

.UserException: Unexpected query token ': l2 ' Does anybody have any idea how to solve these problems? Milan mimac ... is the same. Here is complete stack trace: com.objectdb.o.UserException: Unexpected query token ': l2 ' com

trans is not a transaction of em . Maybe different EntityManager instances are used and the L2 cache is enabled. support Support L2 cache? I'm not sure. But why the second find() will output? By

getting data from the L2 data cache (e.g., due to limited RAM and large cache that might be swapped to the disk?). Try to disable the L2 data cache or decrease its size, assuming you use it. support

memory size of ObjectDB L2 cache or EntityManager context ? Q4: Would paging result sets ... of the L2 cache. Using setFirstResult and setMaxResults could improve performance, but the effect

that the entity and its state must not be cached by the provider. Since: JPA 2.0 The Shared ( L2 ) Entity Cache

The Shared ( L2 ) Entity Cache article explains how to use CacheStoreMode . Enum Constants BYPASS Don't

JPA Enum CacheRetrieveMode java.lang.Object ∟  java.lang.Enum ∟  javax.persistence.CacheRetrieveMode Used as the value of the javax.persistence.cache.retrieveMode property to specify the behavior when data is retrieved by the find methods and by queries. Since: JPA 2.0 The Shared ( L2

JPA Interface Cache Interface used to interact with the second-level cache. If a cache is not in use, the methods of this interface have no effect, except for contains , which returns false. Since: JPA 2.0 The Shared ( L2 ) Entity Cache article explains how to use Cache . Public Methods boolean

cache.  I disable the L2 cache and use 1 MB for the ObjectDB Datastore page file cache

of the profiler. First i thought it might be the L2 Cache or something simular but then i could not understand

discard cached objects in the EntityManager and in the L2 cache.  support Support

is tight, you may have to reduce the sizes of the processing cache , the L2 data cache , and the query results cache . support Support

and disable the L2 data cache. support Support What about calling em.flush(); em.clear

classes. Reduce cache size. You can disable the L2 data cache by setting its size to 0. Use smaller

have this feature, (and L1 or L2 cache is not a guarantee that i'll get the same object

? 3. Can you give us details on how you implement the L1 and L2 caches?   Thank you Emil  

general:temp:threshold value can reduce temporary files usage. The L2 cache does not always help

needed? sjzlondon Steve Zara You can use evictAll  if it works for you. Note that if the L2

this feature is not supported. ObjectDB L2 cache is per EntityManagerFactory , i.e. for multiple

cache Front end shared L2 data cache Front end object cache Query program cache Query results cache

for this project. Any help, please? zmirc Mircea Chirac You can configure the L2 cache in

, in order to avoid retrieving obsolete content from the L2 cache. In your test the PKs are large (32

Added support of report generation using BIRT . Fixed a bug in query optimization of DISTINCT. Fixed a bug in keeping removed entity object in the L2 cache. Fixed orphan removal of owner entity object in bidirectional relationship. Fixed an "Attempt to persist a reference to a non managed instance

. The objects that are added to the heap are related to: (1) the L2 cache, (2) the query caches

Changed log format to include date and time . Changed class loader management. Fixed handling multiple order expressions in inverse (mapped by) fields. Fixed the behavior of CacheStoreMode setting in L2 shared cache. Fixed  TreeSet and TreeMap  element comparison bugs. Fixed an Explorer

Support The test case in #2 above does throw an exception when the L2 cache is disabled, as the tree set