Module org.eclipse.persistence.core
Package org.eclipse.persistence.annotations

Annotation Type UnionPartitioning

@Target({TYPE,METHOD,FIELD}) @Retention(RUNTIME) public @interface UnionPartitioning
UnionPartitioning sends queries to all connection pools and unions the results. This is for queries or relationships that span partitions when partitioning is used, such as on a ManyToMany cross partition relationship.

Partitioning can be enabled on an Entity, relationship, query, or session/persistence unit. Partition policies are globally named to allow reuse, the partitioning policy must also be set using the @Partitioned annotation to be used.

Since:
EclipseLink 2.2
See Also:

  • Required Element Summary

    Required Elements
    Modifier and Type
    Required Element
    Description
    String
    name
    The name of the partition policy, names must be unique for the persistence unit.

  • Optional Element Summary

    Optional Elements
    Modifier and Type
    Optional Element
    Description
    String[]
    connectionPools
    List of connection pool names to load balance across.
    boolean
    replicateWrites
    Defines if write queries should be replicated.

  • Element Details

    • name

      String name
      The name of the partition policy, names must be unique for the persistence unit.

    • connectionPools

      String[] connectionPools
      List of connection pool names to load balance across. Defaults to all defined pools in the ServerSession.
      Default:
      {}

    • replicateWrites

      boolean replicateWrites
      Defines if write queries should be replicated. Writes are normally not replicated when unioning, but can be for ManyToMany relationships, when the join table needs to be replicated.
      Default:
      false