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| <div class="refsect1"> |
| <h2 class="refsect1"><font face="arial, helvetica, sans-serif" color="#330099">@RangePartitioning</font></h2> |
| <p>Use <code>@RangePartitioning</code> to partitions access to a database cluster by a field value from the object (such as the object's ID, location, or tenant).</p> |
| <p>EclipseLink assigns each server a range of values. All write or read request for objects with a server's value are sent to that specific 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 session's default behavior.</p> |
| <a id="sthref326" name="sthref326"></a> |
| <p><strong><br /><span class="refsubsect">Annotation Elements</span></strong></p> |
| <p><a href="#BCGHJEBE">Table 2-58</a> describes this annotation's elements.</p> |
| <div class="tblhruleformalwide"><a id="TLJPA520" name="TLJPA520"></a><a id="sthref327" name="sthref327"></a><a id="BCGHJEBE" name="BCGHJEBE"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Table 2-58 @RangePartitioning Annotation Elements</font></em></strong></p> |
| <table class="HRuleFormalWide" title="@RangePartitioning Annotation Elements" summary="This table describes this annotation’s elements." dir="ltr" border="1" width="100%" frame="hsides" rules="rows" cellpadding="3" cellspacing="0"> |
| <col width="28%" /> |
| <col width="*" /> |
| <col width="20%" /> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t69"><font face="Arial, Helvetica, sans-serif"><strong>Annotation Element</strong></font></th> |
| <th align="left" valign="bottom" id="r1c2-t69"><font face="Arial, Helvetica, sans-serif"><strong>Description</strong></font></th> |
| <th align="left" valign="bottom" id="r1c3-t69"><font face="Arial, Helvetica, sans-serif"><strong>Default</strong></font></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr align="left" valign="top"> |
| <td align="left" id="r2c1-t69" headers="r1c1-t69"> |
| <p><code>name</code></p> |
| </td> |
| <td align="left" headers="r2c1-t69 r1c2-t69"> |
| <p>(Required) The name of the partition policy; must be unique for the persistence unit.</p> |
| </td> |
| <td align="left" headers="r2c1-t69 r1c3-t69"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r3c1-t69" headers="r1c1-t69"> |
| <p><code>partitionColumn</code></p> |
| </td> |
| <td align="left" headers="r3c1-t69 r1c2-t69"> |
| <p>(Required) The database column or query parameter to partition queries by. This is the <em>table column name</em>, not the class attribute name. The column value must be included in the query and should normally be part of the object's ID.</p> |
| <p>This can also be the name of a query parameter. If a query does not contain the field the query will not be partitioned.</p> |
| </td> |
| <td align="left" headers="r3c1-t69 r1c3-t69"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r4c1-t69" headers="r1c1-t69"> |
| <p><code>partitions</code></p> |
| </td> |
| <td align="left" headers="r4c1-t69 r1c2-t69"> |
| <p>(Required) List of connection pool names to partition across.</p> |
| </td> |
| <td align="left" headers="r4c1-t69 r1c3-t69"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r5c1-t69" headers="r1c1-t69"> |
| <p><code>partitionValueType</code></p> |
| </td> |
| <td align="left" headers="r5c1-t69 r1c2-t69"> |
| <p>The type of the start and end values.</p> |
| </td> |
| <td align="left" headers="r5c1-t69 r1c3-t69"> |
| <p><code>String</code></p> |
| </td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r6c1-t69" headers="r1c1-t69"> |
| <p><code>unionunpartionableQueries</code></p> |
| </td> |
| <td align="left" headers="r6c1-t69 r1c2-t69"> |
| <p>Defines if queries that do not contain the partition field should be sent to every database and have the result unioned.</p> |
| </td> |
| <td align="left" headers="r6c1-t69 r1c3-t69"> |
| <p><code>false</code></p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <br /></div> |
| <!-- class="tblhruleformalwide" --> |
| <a id="sthref328" name="sthref328"></a> |
| <p><strong><br /><span class="refsubsect">Usage</span></strong></p> |
| <p>Partitioning can be enabled on an Entity, relationship, query, or session/persistence unit.</p> |
| <p>Partition policies are globally named to allow reuse, the partitioning policy must also be set using the <code>@Partitioned</code> annotation to be used.</p> |
| <p>The persistence unit properties support adding named connection pools in addition to the existing configuration for read/write/sequence. A named connection pool must be defined for each node in the database cluster.</p> |
| <p>If a transaction modifies data from multiple partitions, you should use JTA ensure proper two-phase commit of the data. You can also configure an exclusive connection in the EntityManager to ensure that only a single node is used for a single transaction.</p> |
| <a id="sthref329" name="sthref329"></a> |
| <p><strong><br /><span class="refsubsect">Examples</span></strong></p> |
| <p><a href="#BCGIJGHH">Example 2-95</a> shows how to use the <code>@RangePartitioning</code> annotation</p> |
| <div class="example"><a id="BCGIJGHH" name="BCGIJGHH"></a><a id="TLJPA521" name="TLJPA521"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-95 Using @RangePartitioning Annotation</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| @Entity |
| @Table(name="PART_PROJECT") |
| <strong>@RangePartitioning</strong>( |
| name="RangePartitioningByPROJ_ID", |
| partitionColumn=@Column(name="PROJ_ID"), |
| partitionValueType=Integer.class, |
| unionUnpartitionableQueries=true, |
| partitions={ |
| @RangePartition(connectionPool="default", startValue="0", endValue="1000"), |
| @RangePartition(connectionPool="node2", startValue="1000", endValue="2000"), |
| @RangePartition(connectionPool="node3", startValue="2000") |
| }) |
| @Partitioned("RangePartitioningByPROJ_ID") |
| public class Project implements Serializable { |
| ... |
| } |
| </pre></div> |
| <!-- class="example" --> |
| <p><a href="#BCGIJGHH">Example 2-95</a> shows how to use the <code><range-partitioning></code> element in the <code>eclipselink-orm.xml</code> file.</p> |
| <div class="example"><a id="TLJPA522" name="TLJPA522"></a><a id="sthref330" name="sthref330"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-96 Using <range-partitioning> XML</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <entity name="Project" class="Project" access="FIELD"> |
| <table name="PART_PROJECT"/> |
| <<strong>range-partitioning</strong> name="RangePartitioningByPROJ_ID" partition-value-type="java.lang.Integer" union-unpartitionable-queries="true"> |
| <partition-column name="PROJ_ID"/> |
| <partition connection-pool="default" start-value="0" end-value="1000"/> |
| <partition connection-pool="node2" start-value="1000" end-value="2000"/> |
| <partition connection-pool="node3" start-value="2000"/> |
| </range-partitioning> |
| <partitioned>RangePartitioningByPROJ_ID</partitioned> |
| </entity> |
| </pre></div> |
| <!-- class="example" --> |
| <a id="sthref331" name="sthref331"></a> |
| <p><strong><br /><span class="refsubsect">See Also</span></strong></p> |
| <p>For more information, see:</p> |
| <ul> |
| <li> |
| <p><a href="a_rangepartition.htm#BABCFDAJ">"@RangePartition"</a></p> |
| </li> |
| <li> |
| <p><a href="a_partitioned.htm#CHDDAHEB">"@Partitioned"</a></p> |
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