About fetch


Use temporary files to enable very large transactions

We have transactions in which many objects are created. These objects are no longer needed in the current transaction after creation. Unfortunately, we will receive an OutOfMemory exception because the objects are kept in the first level cache of ObjectDB. In the forum thread http://www.objectdb.com/database/forum/921 on post #4 you wrote, that ObjectDB should support very large transactions in further version. Can you implement it that ObjectDB used temporary files? ... level2 = "0" /> <fetch hollow = "false" /> <persist ...


Error 363 - Failed to read value of inverse relationship

I've got two objects: @Entity public class EEvent { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long id; @ManyToOne(optional=false) private ETown town; public ETown getTown() { return town; } public void setTown(ETown town) { this.town = town; } } And: ... text ;   @ OneToMany ( /*fetch=FetchType.LAZY, cascade=CascadeType.ALL, */ mappedBy = ...


Unexpected exception (Error 990) on find

I have a huge amount of inserts/updates and after a about 850.000 Entities I got the following error: ... ;   @ ElementCollection ( fetch = FetchType . EAGER ) @ CollectionTable ...