说明：之前使用range分区做出来的效果不明显，这次使用hash分区。

1、准备工作：

 ----创建两张一样的hash分区表，jacks_part和echos_part------------------ 1 SQL> create table jacks_part (owner varchar2(30),object_id number,object_name varchar2(128))
 2   2     partition by hash(object_id)
 3   3  partitions 30;
 4
 5 Table created.
 6
 7 SQL> create table echos_part (owner varchar2(30),object_id number,object_name varchar2(128))
 8   2     partition by hash(object_id)
 9   3  partitions 30;
10
11 Table created.
12
 ----分别向两张表插入一些记录-----------------13 SQL> insert into jacks_part select owner,object_id,object_name from dba_objects;
14
15 72196 rows created.
16
17 SQL> insert into echos_part select owner,object_id,object_name from jacks_part;
18
19 72196 rows created.
20
21 SQL> commit;
22
23 Commit complete.
24
 ----分别创建global索引和local索引---------------25 SQL> create index globals_ind on jacks_part(object_id)
26   2   global partition by hash(object_id);
27
28 Index created.
29
30 SQL> create index locals_ind on echos_part(object_id) local;
31
32 Index created.
33
 ----查询索引是否正确--------------------------34 SQL> select index_name,table_name,locality from user_part_indexes;
35
36 INDEX_NAME                 TABLE_NAME              LOCALI
37 ------------------ ------------------------------ ------
38 LOCALS_IND                ECHOS_PART                LOCAL
39 GLOBALS_IND               JACKS_PART               GLOBAL

2、分区索引性能优于全局索引的例子：

 1 SQL> set linesize 200;
 2 SQL> set autotrace traceonly;
 3 SQL> select /*+ index(echos_part,locals_ind) */ * from  echos_part where object_id>100;
 4
 5 72097 rows selected.
 6
 7
 8 Execution Plan
 9 ----------------------------------------------------------
10 Plan hash value: 3092815211
11
12 -----------------------------------------------------------------------------------------------------------------
13 | Id  | Operation               | Name    | Rows    | Bytes | Cost (%CPU)| Time    | Pstart| Pstop |
14 -----------------------------------------------------------------------------------------------------------------
15 |   0 | SELECT STATEMENT           |        |  4228 |   396K|    89   (0)| 00:00:02 |    |    |
16 |   1 |  PARTITION HASH ALL           |        |  4228 |   396K|    89   (0)| 00:00:02 |     1 |    30 |
17 |   2 |   TABLE ACCESS BY LOCAL INDEX ROWID| ECHOS_PART |  4228 |   396K|    89   (0)| 00:00:02 |     1 |    30 |
18 |*  3 |    INDEX RANGE SCAN           | LOCALS_IND |  4228 |    |    25   (0)| 00:00:01 |     1 |    30 |
19 -----------------------------------------------------------------------------------------------------------------
20
21 Predicate Information (identified by operation id):
22 ---------------------------------------------------
23
24    3 - access("OBJECT_ID">100)
25
26 Note
27 -----
28    - dynamic sampling used for this statement (level=2)
29
30
31 Statistics
32 ----------------------------------------------------------
33       0    recursive calls
34       0    db block gets
35    10562   consistent gets
36       0    physical reads
37       0    redo size
38   3128267  bytes sent via SQL*Net to client
39    53285   bytes received via SQL*Net from client
40    4808    SQL*Net roundtrips to/from client
41       0    sorts (memory)
42       0    sorts (disk)
43    72097   rows processed
44
45 SQL> select /*+ index(jacks_part,globals_ind) */ * from  jacks_part where object_id>100;
46
47 72097 rows selected.
48
49
50 Execution Plan
51 ----------------------------------------------------------
52 Plan hash value: 2501448352
53
54 -------------------------------------------------------------------------------------------------------------------
55 | Id  | Operation                | Name      | Rows  | Bytes | Cost (%CPU)| Time      | Pstart| Pstop |
56 -------------------------------------------------------------------------------------------------------------------
57 |   0 | SELECT STATEMENT            |          |  2500 |   234K|  4639   (1)| 00:00:56 |      |      |
58 |   1 |  PARTITION HASH SINGLE            |          |  2500 |   234K|  4639   (1)| 00:00:56 |    1 |    1 |
59 |   2 |   TABLE ACCESS BY GLOBAL INDEX ROWID| JACKS_PART  |  2500 |   234K|  4639   (1)| 00:00:56 | ROWID | ROWID |
60 |*  3 |    INDEX RANGE SCAN            | GLOBALS_IND |  2500 |      |    15   (0)| 00:00:01 |    1 |    1 |
61 -------------------------------------------------------------------------------------------------------------------
62
63 Predicate Information (identified by operation id):
64 ---------------------------------------------------
65
66    3 - access("OBJECT_ID">100)
67
68 Note
69 -----
70    - dynamic sampling used for this statement (level=2)
71
72
73 Statistics
74 ----------------------------------------------------------
75       0    recursive calls
76       0    db block gets
77    74718   consistent gets
78       0    physical reads
79       0    redo size
80   3077218  bytes sent via SQL*Net to client
81    53285   bytes received via SQL*Net from client
82     4808   SQL*Net roundtrips to/from client
83       0    sorts (memory)
84       0    sorts (disk)
85    72097   rows processed

3、分区索引性能低于全局索引的例子1：

 1 SQL> select /*+ index(echos_part,locals_ind) */ count(*) from  echos_part where object_id>100;
 2
 3
 4 Execution Plan
 5 ----------------------------------------------------------
 6 Plan hash value: 2317569636
 7
 8 --------------------------------------------------------------------------------------------------
 9 | Id  | Operation        | Name     | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
10 --------------------------------------------------------------------------------------------------
11 |   0 | SELECT STATEMENT    |         |     1 |    13 |    25   (0)| 00:00:01 |     |     |
12 |   1 |  SORT AGGREGATE     |         |     1 |    13 |          |      |     |     |
13 |   2 |   PARTITION HASH ALL|         |  4228 | 54964 |    25   (0)| 00:00:01 |     1 |    30 |
14 |*  3 |    INDEX RANGE SCAN | LOCALS_IND |  4228 | 54964 |    25   (0)| 00:00:01 |     1 |    30 |
15 --------------------------------------------------------------------------------------------------
16
17 Predicate Information (identified by operation id):
18 ---------------------------------------------------
19
20    3 - access("OBJECT_ID">100)
21
22 Note
23 -----
24    - dynamic sampling used for this statement (level=2)
25
26
27 Statistics
28 ----------------------------------------------------------
29       0  recursive calls
30       0  db block gets
31     205  consistent gets
32       0  physical reads
33       0  redo size
34     424  bytes sent via SQL*Net to client
35     419  bytes received via SQL*Net from client
36       2  SQL*Net roundtrips to/from client
37       0  sorts (memory)
38       0  sorts (disk)
39       1  rows processed
40
41 SQL> select /*+ index(jacks_part,globals_ind) */ count(*) from  jacks_part where object_id>100;
42
43
44 Execution Plan
45 ----------------------------------------------------------
46 Plan hash value: 2478129137
47
48 ------------------------------------------------------------------------------------------------------
49 | Id  | Operation           | Name         | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
50 ------------------------------------------------------------------------------------------------------
51 |   0 | SELECT STATEMENT       |         |       1 |      13 |      15   (0)| 00:00:01 |         |         |
52 |   1 |  SORT AGGREGATE        |         |       1 |      13 |          |         |         |         |
53 |   2 |   PARTITION HASH SINGLE|         |    2500 | 32500 |      15   (0)| 00:00:01 |       1 |       1 |
54 |*  3 |    INDEX RANGE SCAN    | GLOBALS_IND |    2500 | 32500 |      15   (0)| 00:00:01 |       1 |       1 |
55 ------------------------------------------------------------------------------------------------------
56
57 Predicate Information (identified by operation id):
58 ---------------------------------------------------
59
60    3 - access("OBJECT_ID">100)
61
62 Note
63 -----
64    - dynamic sampling used for this statement (level=2)
65
66
67 Statistics
68 ----------------------------------------------------------
69       0  recursive calls
70       0  db block gets
71     201  consistent gets
72       0  physical reads
73       0  redo size
74     424  bytes sent via SQL*Net to client
75     419  bytes received via SQL*Net from client
76       2  SQL*Net roundtrips to/from client
77       0  sorts (memory)
78       0  sorts (disk)
79       1  rows processed

分区索引性能低于全局索引的例子2：

 1 SQL> drop index globals_ind;
 2
 3 Index dropped.
 4
 5 SQL> create index global_indexs on jacks_part(object_id) global;
 6
 7 Index created.
 8
 9 SQL> select /*+ index(echos_part,locals_ind) */ count(*) from  echos_part where object_id>100;
10
11
12
13 Execution Plan
14 ----------------------------------------------------------
15 Plan hash value: 2317569636
16
17 --------------------------------------------------------------------------------------------------
18 | Id  | Operation        | Name     | Rows  | Bytes | Cost (%CPU)| Time     | Pstart| Pstop |
19 --------------------------------------------------------------------------------------------------
20 |   0 | SELECT STATEMENT    |         |     1 |     5 |   175   (0)| 00:00:03 |     |     |
21 |   1 |  SORT AGGREGATE     |         |     1 |     5 |          |      |     |     |
22 |   2 |   PARTITION HASH ALL|         | 72101 |   352K|   175   (0)| 00:00:03 |     1 |    30 |
23 |*  3 |    INDEX RANGE SCAN | LOCALS_IND | 72101 |   352K|   175   (0)| 00:00:03 |     1 |    30 |
24 --------------------------------------------------------------------------------------------------
25
26 Predicate Information (identified by operation id):
27 ---------------------------------------------------
28
29    3 - access("OBJECT_ID">100)
30
31
32 Statistics
33 ----------------------------------------------------------
34    1704  recursive calls
35       0  db block gets
36     437  consistent gets
37     206  physical reads
38       0  redo size
39
40 SQL> select /*+ index(jacks_part,global_indexs) */ count(*) from  jacks_part where object_id>100;
41
42
43 Execution Plan
44 ----------------------------------------------------------
45 Plan hash value: 1016566238
46
47 -----------------------------------------------------------------------------------
48 | Id  | Operation      | Name      | Rows  | Bytes | Cost (%CPU)| Time      |
49 -----------------------------------------------------------------------------------
50 |   0 | SELECT STATEMENT  |          |    1 |    5 |   201   (0)| 00:00:03 |
51 |   1 |  SORT AGGREGATE   |          |    1 |    5 |           |      |
52 |*  2 |   INDEX RANGE SCAN| GLOBAL_INDEXS | 72101 |   352K|   201   (0)| 00:00:03 |
53 -----------------------------------------------------------------------------------
54
55 Predicate Information (identified by operation id):
56 ---------------------------------------------------
57
58    2 - access("OBJECT_ID">100)
59
60
61 Statistics
62 ----------------------------------------------------------
63       1  recursive calls
64       0  db block gets
65     201  consistent gets
66     200  physical reads
67       0  redo size

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