What are number-of-subpartitions of composite range-hash partitioning tables

What are number-of-subpartitions of composite range-hash partitioning tables (number of subpartitions在组合分区表中的作用)？

 

10g官档中：http://docs.oracle.com/cd/B19306_01/server.102/b14231/partiti.htm#sthref2602

CREATE TABLE scubagear (equipno NUMBER, equipname VARCHAR(32), price NUMBER)

  PARTITION BY RANGE (equipno) SUBPARTITION BY HASH(equipname)

    SUBPARTITIONS 8 STORE IN (ts1, ts2, ts3, ts4)

      (PARTITION p1 VALUES LESS THAN (1000),

       PARTITION p2 VALUES LESS THAN (2000),

       PARTITION p3 VALUES LESS THAN (MAXVALUE));

答案：

Number of subpartitions (subpartitions 8 store in)：每个分区（P1、P2、P3）按照8个子分区（oracle自动分赔的子分区）存储在store in 指定的表空间当中

 

1、Create table t1 and Subpartition=1

doudou@TEST> CREATE TABLE t1 (equipno NUMBER, equipname VARCHAR(32), price NUMBER)

  2    PARTITION BY RANGE (equipno) SUBPARTITION BY HASH(equipname)

  3      SUBPARTITIONS 1 STORE IN (users, doudou, maclean)

  4        (PARTITION p1 VALUES LESS THAN (1000),

  5         PARTITION p2 VALUES LESS THAN (2000),

  6         PARTITION p3 VALUES LESS THAN (MAXVALUE));

Table created.

doudou@TEST> select table_name,partition_name,subpartition_name,subpartition_position,tablespace_name from sys.user_tab_subpartitions t where table_name='T1'

  2  order by table_name,subpartition_name,tablespace_name

TABLE_NAME           PARTITION_NAME       SUBPARTITION_NAME    SUBPARTITION_POSITION TABLESPACE_NAME

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

T1                  P1                   SYS_SUBP62                               1 USERS

T1                  P2                   SYS_SUBP63                               1 USERS

T1                  P3                   SYS_SUBP64                               1 USERS

【当subpartition=1时，一个分区只有一个自分区，每个子分区存储在一个单独表空间】

 

2、Create table t2 and Subpartition=2

doudou@TEST> CREATE TABLE t2 (equipno NUMBER, equipname VARCHAR(32), price NUMBER)

  2    PARTITION BY RANGE (equipno) SUBPARTITION BY HASH(equipname)

  3      SUBPARTITIONS 2 STORE IN (users, doudou, maclean)

  4        (PARTITION p1 VALUES LESS THAN (1000),

  5         PARTITION p2 VALUES LESS THAN (2000),

  6         PARTITION p3 VALUES LESS THAN (MAXVALUE));

Table created.

doudou@TEST> select table_name,partition_name,subpartition_name,subpartition_position,tablespace_name from sys.user_tab_subpartitions t where table_name='T2'

  2  order by table_name,subpartition_name,tablespace_name;

TABLE_NAME           PARTITION_NAME       SUBPARTITION_NAME    SUBPARTITION_POSITION TABLESPACE_NAME

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

T2                  P1                   SYS_SUBP65                               1 USERS

T2                  P1                   SYS_SUBP66                               2 DOUDOU

T2                  P2                   SYS_SUBP67                               1 USERS

T2                  P2                   SYS_SUBP68                               2 DOUDOU

T2                  P3                   SYS_SUBP69                               1 USERS

T2                  P3                   SYS_SUBP70                               2 DOUDOU

【当subpartition=2时，每个分区有2个子分区，每个子分区存储在一个单独表空间】

 

3、create table t3 and subpartition=3

doudou@TEST> CREATE TABLE t3 (equipno NUMBER, equipname VARCHAR(32), price NUMBER)

  2    PARTITION BY RANGE (equipno) SUBPARTITION BY HASH(equipname)

  3      SUBPARTITIONS 3 STORE IN (users, doudou, maclean)

  4        (PARTITION p1 VALUES LESS THAN (1000),

  5         PARTITION p2 VALUES LESS THAN (2000),

  6         PARTITION p3 VALUES LESS THAN (MAXVALUE));

Table created.

doudou@TEST>

doudou@TEST> select table_name,partition_name,subpartition_name,subpartition_position,tablespace_name from sys.user_tab_subpartitions t where table_name='T3'

  2  order by table_name,subpartition_name,tablespace_name;

TABLE_NAME           PARTITION_NAME       SUBPARTITION_NAME    SUBPARTITION_POSITION TABLESPACE_NAME

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

T3                  P1                   SYS_SUBP71                               1 USERS

T3                  P1                   SYS_SUBP72                               2 DOUDOU

T3                  P1                   SYS_SUBP73                               3 MACLEAN

T3                  P2                   SYS_SUBP74                               1 USERS

T3                  P2                   SYS_SUBP75                               2 DOUDOU

T3                  P2                   SYS_SUBP76                               3 MACLEAN

T3                  P3                   SYS_SUBP77                               1 USERS

T3                  P3                   SYS_SUBP78                               2 DOUDOU

T3                  P3                   SYS_SUBP79                               3 MACLEAN

【当subpartition=3时，每个分区有3个子分区，每个子分区存储在一个单独表空间】

 

4、create table t4 and subpartition=4

doudou@TEST> CREATE TABLE t4 (equipno NUMBER, equipname VARCHAR(32), price NUMBER)

  2    PARTITION BY RANGE (equipno) SUBPARTITION BY HASH(equipname)

  3      SUBPARTITIONS 4 STORE IN (users, doudou, maclean)

  4        (PARTITION p1 VALUES LESS THAN (1000),

  5         PARTITION p2 VALUES LESS THAN (2000),

  6         PARTITION p3 VALUES LESS THAN (MAXVALUE));

Table created.

doudou@TEST> select table_name,partition_name,subpartition_name,subpartition_position,tablespace_name from sys.user_tab_subpartitions t where table_name='T4'

  2  order by table_name,subpartition_name,tablespace_name;

 

TABLE_NAME           PARTITION_NAME       SUBPARTITION_NAME    SUBPARTITION_POSITION TABLESPACE_NAME

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

T4                  P1                   SYS_SUBP80                               1 USERS

T4                  P1                   SYS_SUBP81                               2 DOUDOU

T4                  P1                   SYS_SUBP82                               3 MACLEAN

T4                  P1                   SYS_SUBP83                               4 USERS

T4                  P2                   SYS_SUBP84                               1 USERS

T4                  P2                   SYS_SUBP85                               2 DOUDOU

T4                  P2                   SYS_SUBP86                               3 MACLEAN

T4                  P2                   SYS_SUBP87                               4 USERS

T4                  P3                   SYS_SUBP88                               1 USERS

T4                  P3                   SYS_SUBP89                               2 DOUDOU

T4                  P3                   SYS_SUBP90                               3 MACLEAN

T4                  P3                   SYS_SUBP91                               4 USERS

【当subpartition=4时，每个分区有4个子分区，每个子分区存储在一个单独表空间】

 

5、create table t5 and subpartition=8

doudou@TEST> CREATE TABLE t5 (equipno NUMBER, equipname VARCHAR(32), price NUMBER)

  2    PARTITION BY RANGE (equipno) SUBPARTITION BY HASH(equipname)

  3      SUBPARTITIONS 8 STORE IN (users, doudou, maclean)

  4        (PARTITION p1 VALUES LESS THAN (1000),

  5         PARTITION p2 VALUES LESS THAN (2000),

  6         PARTITION p3 VALUES LESS THAN (MAXVALUE));

Table created.

doudou@TEST> select table_name,partition_name,subpartition_name,subpartition_position,tablespace_name from sys.user_tab_subpartitions t where table_name='T5'

  2  order by table_name,subpartition_name,tablespace_name;

TABLE_NAME           PARTITION_NAME       SUBPARTITION_NAME    SUBPARTITION_POSITION TABLESPACE_NAME

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

T5                  P2                   SYS_SUBP100                              1 USERS

T5                  P2                   SYS_SUBP101                              2 DOUDOU

T5                  P2                   SYS_SUBP102                              3 MACLEAN

T5                  P2                   SYS_SUBP103                              4 USERS

T5                  P2                   SYS_SUBP104                              5 DOUDOU

T5                  P2                   SYS_SUBP105                              6 MACLEAN

T5                  P2                   SYS_SUBP106                              7 USERS

T5                  P2                   SYS_SUBP107                              8 DOUDOU

T5                  P3                   SYS_SUBP108                              1 USERS

T5                  P3                   SYS_SUBP109                              2 DOUDOU

T5                  P3                   SYS_SUBP110                              3 MACLEAN

T5                  P3                   SYS_SUBP111                              4 USERS

T5                  P3                   SYS_SUBP112                              5 DOUDOU

T5                  P3                   SYS_SUBP113                              6 MACLEAN

T5                  P3                   SYS_SUBP114                              7 USERS

T5                  P3                   SYS_SUBP115                              8 DOUDOU

T5                  P1                   SYS_SUBP92                               1 USERS

T5                  P1                   SYS_SUBP93                               2 DOUDOU

T5                  P1                   SYS_SUBP94                               3 MACLEAN

T5                  P1                   SYS_SUBP95                               4 USERS

T5                  P1                   SYS_SUBP96                               5 DOUDOU

T5                  P1                   SYS_SUBP97                               6 MACLEAN

T5                  P1                   SYS_SUBP98                               7 USERS

T5                  P1                   SYS_SUBP99                               8 DOUDOU

【当subpartition=8时，每个分区有8个子分区，每个子分区存储在一个单独表空间】

 

总结：number of subpartitions

1、subpartiton=N时，每个分区有N个子分区【N的范围(1-1048575)】

2、每个子分区存储在一个单独的表空间

 

 

附表

Subpartition number范围知识点

http://docs.oracle.com/cd/B19306_01/server.102/b14219/e12700.htm#sthref4406

本文研究：When to Use Composite Range-Hash Partitioning

http://docs.oracle.com/cd/B19306_01/server.102/b14231/partiti.htm#sthref2602

 

思路：

1、  subpartition 8不是很懂，通过GOOGLE，MOS，百度。找到user_ind_partitions视图，然后就想起来了，user_tab_partitions视图。PLSQL中 select * from user_tab_partitions发现了一些不同，继而发现问题。

2、  最后根据对比看视图的结果，发现问题所在。