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在Oracle 11g上,可以在虚拟列上做分区,这个特性还比较有用,下面来做一个测试:SQL> select * from v$version;BANNER
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Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for Linux: Version 11.2.0.1.0 - ProductionNLSRTL Version 11.2.0.1.0 - ProductionSQL> drop table test purge;
SQL> create table test
    (bureau_code varchar2(20) not null,
   province_code as (CAST(SUBSTR(bureau_code,0,2) AS VARCHAR2(2)))
    )
    partition by list (province_code)
    (
    partition p1 values ("01"),
    partition p2 values ("02"),
    partition p3 values ("03"),
    partition p4 values ("04"),
    partition p5 values ("05")
    );SQL> insert into test(bureau_code) values("0101");
SQL> insert into test(bureau_code) values("0102");
SQL> insert into test(bureau_code) values("0202");
SQL> insert into test(bureau_code) values("0202");
SQL> insert into test(bureau_code) values("0302");
SQL> insert into test(bureau_code) values("0302");
SQL> insert into test(bureau_code) values("0402");
SQL> insert into test(bureau_code) values("0502");
SQL> commit;SQL> select * from test partition(p1);
BUREAU_CODE          PR
-------------------- --
0101               01
0102               01SQL> set autotrace traceonly
SQL> select * from test partition(p1);
执行计划
----------------------------------------------------------
Plan hash value: 213508695
----------------------------------------------------------------------------------------------
| Id  | Operation           | Name | Rows  | Bytes | Cost (%CPU)| Time   | Pstart| Pstop |
----------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT      |      |   2 |    30 |   4 (0)| 00:00:01 |     |     |
| 1 |  PARTITION LIST SINGLE|      |   2 |    30 |   4 (0)| 00:00:01 |   1 |   1 |
| 2 | TABLE ACCESS FULL | TEST |   2 |    30 |   4 (0)| 00:00:01 |   1 |   1 |--证明是走了分区的
----------------------------------------------------------------------------------------------
Note
-----
 - dynamic sampling used for this statement (level=2)
统计信息
----------------------------------------------------------
          0  recursive calls
          0  db block gets
          8  consistent gets
          0  physical reads
          0  redo size
        434  bytes sent via SQL*Net to client
        338  bytes received via SQL*Net from client
          2  SQL*Net roundtrips to/from client
          0  sorts (memory)
          0  sorts (disk)
          2  rows processed更多Oracle相关信息见Oracle 专题页面 http://www.linuxidc.com/topicnews.aspx?tid=12本文永久更新链接地址