Oracle的分区技术在某些条件下可以极大的提高查询的性能，所以被广泛采用。从产品上说，分区技术是Oracle企业版中独立收费的一个组件。以下是对于分区及本地索引的一个示例。
首先根据字典表创建一个测试分区表：
| SQL> connect eygle/eygle Connected. SQL> CREATE TABLE dbobjs 2 (OBJECT_ID NUMBER NOT NULL, 3 OBJECT_NAME varchar2(128), 4 CREATED DATE NOT NULL 5 ) 6 PARTITION BY RANGE (CREATED) 7 (PARTITION dbobjs_06 VALUES LESS THAN (TO_DATE('01/01/2007', 'DD/MM/YYYY')), 8 PARTITION dbobjs_07 VALUES LESS THAN (TO_DATE('01/01/2008', 'DD/MM/YYYY'))); Table created. SQL> COL segment_name for a20 SQL> COL PARTITION_NAME for a20 SQL> SELECT segment_name, partition_name, tablespace_name 2 FROM dba_segments 3 WHERE segment_name = 'DBOBJS'; SEGMENT_NAME PARTITION_NAME TABLESPACE_NAME -------------------- -------------------- ------------------------------ DBOBJS DBOBJS_06 EYGLE DBOBJS DBOBJS_07 EYGLE |
创建一个Local索引，注意这里可以将不同分区的索引指定创建到不同的表空间：
| SQL> CREATE INDEX dbobjs_idx ON dbobjs (created) LOCAL 2 (PARTITION dbobjs_06 TABLESPACE users, 3 PARTITION dbobjs_07 TABLESPACE users 4 ); Index created. |
这个子句可以进一步调整为类似：
| CREATE INDEX dbobjs_idx ON dbobjs (created) LOCAL (PARTITION dbobjs_06 TABLESPACE users, PARTITION dbobjs_07 TABLESPACE users ) TABLESPACE users; |
