5 | Lock prevents PersistenceManager.close when retainValues = false for detachment during a PersistenceManager close operation. The retainValues == false mode affects commit |
5 | ClassCastException on closing PersistenceManager embeddable detachment feature. Since this feature was requested by you recently and requires enabling |
5 | Fetch Set from DB only works on debug mode about detached entities in the manual and also see the discussion on this issue including the solution in |
5 | Import data from MySQL data from MySQL using JPA as entity objects, detach the retrieved entity objects and then persist |
5 | OptimisticLockException by invoking clear. JDO provides some additional settings in which objects are automatically detached |
5 | Significant I/O costs during batch update or insert data.Our application has some complex entities. We do batch update(merge detached entity) every 2 minutes. We find the period significant IO costs these days, and disappeared when turn off the batch updating. 1.ObjectDB is in embedded mode. 2.ObjectDB version is 2.3.7 3.Database file size is nearly |
1 | Read only hint for querySecond thing after @FetchGroup I've found is read-only hint for EM. You can specify this hint to EM when executing query meaning that returned data will never be edited or persisted. My understanding of this is that each entity returned from query is in detached state as default state. query |
1 | Unexpected exception (Error 990) - Merge with no TransactionI am frequently having an error when merging a detached object outside of a transaction. (Is this allowed? I am not trying to modify the object, just read data from it.) Here is a test case: package com.experiments; import javax.persistence.*; import java.util.HashMap; public class |
1 | Use temporary files to enable very large transactions the first level cache (by flush() and detach()). But an array of bytes, any ObjectDB memory |
1 | ObjectDB 2.5.0Added support of nested paths in JOIN FETCH. Added support of persisting collections and maps of user defined types. Added support of Google (Guava) collections. Added support of inheritance of ID fields. Added support of disabling detachment on rollback in JPA. Added support of using entity |
