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@Target(value={TYPE,METHOD,FIELD}) @Retention(value=RUNTIME) public @interface ValuePartitioning
ValuePartitioning partitions access to a database cluster by a field value from the object, such as the object's location, or tenant. Each value is assigned a specific server. All write or read request for object's with that value are sent to the server. If a query does not include the field as a parameter, then it can either be sent to all server's and unioned, or left to the sesion's default behavior.
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.
Partitioned
,
ValuePartitioningPolicy
Required Element Summary | |
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java.lang.String |
name
The name of the partition policy, names must be unique for the persistence unit. |
Column |
partitionColumn
The database column or query parameter to partition queries by. |
ValuePartition[] |
partitions
Store the value partitions. |
Optional Element Summary | |
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java.lang.String |
defaultConnectionPool
The default connection pool is used for any unmapped values. |
java.lang.Class |
partitionValueType
The type of the start and end values. |
boolean |
unionUnpartitionableQueries
Defines if queries that do not contain the partition field should be sent to every database and have the result unioned. |
Element Detail |
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public abstract java.lang.String name
public abstract Column partitionColumn
public abstract ValuePartition[] partitions
public abstract java.lang.Class partitionValueType
public abstract java.lang.String defaultConnectionPool
public abstract boolean unionUnpartitionableQueries
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EclipseLink 2.2.0, build 'v20110202-r8913' API Reference | ||||||||
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SUMMARY: REQUIRED | OPTIONAL | DETAIL: ELEMENT |