--环境

SQL> select * from v$version where rownum<2;

BANNER

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Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bi

SQL> create user leshami identified by xxx;

SQL> grant dba to leshami;

--创建演示需要用到的表空间

SQL> create tablespace tbs_tmp datafile '/u02/database/SYBO2/oradata/tbs_tmp.dbf' size 10m autoextend on;

SQL> alter user leshami default tablespace tbs_tmp;

SQL> create tablespace tbs1 datafile '/u02/database/SYBO2/oradata/tbs1.dbf' size 10m autoextend on;

SQL> create tablespace tbs2 datafile '/u02/database/SYBO2/oradata/tbs2.dbf' size 10m autoextend on;

SQL> create tablespace tbs3 datafile '/u02/database/SYBO2/oradata/tbs3.dbf' size 10m autoextend on;

SQL> create tablespace idx1 datafile '/u02/database/SYBO2/oradata/idx1.dbf' size 10m autoextend on;

SQL> create tablespace idx2 datafile '/u02/database/SYBO2/oradata/idx2.dbf' size 10m autoextend on;

SQL> create tablespace idx3 datafile '/u02/database/SYBO2/oradata/idx3.dbf' size 10m autoextend on;

SQL> conn leshami/xxx

-- 创建一个lookup表

CREATE TABLE lookup (

id            NUMBER(10),

description   VARCHAR2(50)

);

--添加主键约束

ALTER TABLE lookup ADD (

CONSTRAINT lookup_pk PRIMARY KEY (id)

);

--插入数据

INSERT INTO lookup (id, description) VALUES (1, 'ONE');

INSERT INTO lookup (id, description) VALUES (2, 'TWO');

INSERT INTO lookup (id, description) VALUES (3, 'THREE');

COMMIT;

CREATE TABLE big_table (

id            NUMBER(10),

created_date  DATE,

lookup_id     NUMBER(10),

data          VARCHAR2(50)

)

PARTITION BY RANGE (created_date)

(PARTITION big_table_2012 VALUES LESS THAN (TO_DATE('01/01/2013', 'DD/MM/YYYY')) tablespace tbs1,

PARTITION big_table_2013 VALUES LESS THAN (TO_DATE('01/01/2014', 'DD/MM/YYYY')) tablespace tbs2,

PARTITION big_table_2014 VALUES LESS THAN (MAXVALUE)tablespace tbs3 ) ;

--填充数据到分区表

DECLARE

l_lookup_id    lookup.id%TYPE;

l_create_date  DATE;

BEGIN

FOR i IN 1 .. 10000 LOOP

IF MOD(i, 3) = 0 THEN

l_create_date := ADD_MONTHS(SYSDATE, -24);

l_lookup_id   := 2;

ELSIF MOD(i, 2) = 0 THEN

l_create_date := ADD_MONTHS(SYSDATE, -12);

l_lookup_id   := 1;

ELSE

l_create_date := SYSDATE;

l_lookup_id   := 3;

END IF;

INSERT INTO big_table (id, created_date, lookup_id, data)

VALUES (i, l_create_date, l_lookup_id, 'This is some data for ' || i);

END LOOP;

COMMIT;

END;

/

--未指定索引分区及存储表空间情形下创建索引

SQL> CREATE INDEX bita_created_date_i ON big_table(created_date) LOCAL;

Index created.

SQL> select index_name, partitioning_type, partition_count from user_part_indexes;

INDEX_NAME                     PARTITI PARTITION_COUNT

------------------------------ ------- ---------------

BITA_CREATED_DATE_I            RANGE                 3

--Author : Leshami

--从下面的查询可知，索引直接存放到分表表对应的表空间

SQL> select partition_name, high_value, tablespace_name from user_ind_partitions;

PARTITION_NAME                 HIGH_VALUE                               TABLESPACE_NAME

------------------------------ ---------------------------------------- ------------------------------

BIG_TABLE_2014                 MAXVALUE                                 TBS3

BIG_TABLE_2013                 TO_DATE(' 2014-01-01 00:00:00', 'SYYYY-M TBS2

M-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA

BIG_TABLE_2012                 TO_DATE(' 2013-01-01 00:00:00', 'SYYYY-M TBS1

M-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA

--删除索引

SQL> drop index bita_created_date_i;

--指定索引分区名表空间名创建索引

SQL> CREATE INDEX bita_created_date_i

2     ON big_table (created_date)

3     LOCAL (

4        PARTITION idx_2012 TABLESPACE idx1,

5        PARTITION idx_2013 TABLESPACE idx2,

6        PARTITION idx_2014 TABLESPACE idx3)

7     PARALLEL 3;

Index created.

SQL> select partition_name, high_value, tablespace_name from user_ind_partitions;

PARTITION_NAME                 HIGH_VALUE                               TABLESPACE_NAME

------------------------------ ---------------------------------------- ------------------------------

IDX_2014                       MAXVALUE                                 IDX3

IDX_2013                       TO_DATE(' 2014-01-01 00:00:00', 'SYYYY-M IDX2

M-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA

IDX_2012                       TO_DATE(' 2013-01-01 00:00:00', 'SYYYY-M IDX1

M-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA

SQL> select * from big_table where rownum<2;

ID CREATED_  LOOKUP_ID DATA

---------- -------- ---------- --------------------------------------------------

1413 20120625          2 This is some data for 1413

--查看local index是否被使用，从下面的执行计划中可知，索引被使用，支持分区消除

SQL> set autot trace exp;

SQL> select * from big_table where created_date=to_date('20120625','yyyymmdd');

Execution Plan

----------------------------------------------------------

Plan hash value: 2556877094

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| Id  | Operation                          | Name                | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |

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|   0 | SELECT STATEMENT                   |                     |     1 |    41 |     2   (0)| 00:00:01 |       |       |

|   1 |  PARTITION RANGE SINGLE            |                     |     1 |    41 |     2   (0)| 00:00:01 |     1 |     1 |

|   2 |   TABLE ACCESS BY LOCAL INDEX ROWID| BIG_TABLE           |     1 |    41 |     2   (0)| 00:00:01 |     1 |     1 |

|*  3 |    INDEX RANGE SCAN                | BITA_CREATED_DATE_I |     1 |       |     1   (0)| 00:00:01 |     1 |     1 |

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