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Oracle Fusion Middleware Java API Reference for Oracle TopLink 11g Release 1 (11.1.1) E28847-01 |
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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. |
javax.persistence.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 javax.persistence.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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