Question

我们所有的Oracle 10g表都有一个名为DATE类型的业务日期的主键。表已经分区到2014年1月31日。使用上面的业务日期列，我需要在2014年的剩余11个月进行分区，你能告诉我应该采取下面列出的方法吗？

1

ALTER TABLE NRGPC.MY_TABLE SPLIT PARTITION MY_TABLE_DEFAULT AT (TO_DATE('02/01/2014', 'MM/DD/YYYY')) 
    INTO (PARTITION MY_TABLE_PRT0214 TABLESPACE NRGPC_DATA, PARTITION MY_TABLE_DEFAULT ) UPDATE INDEXES;
ANALYZE TABLE NRGPC.MY_TABLE PARTITION (MY_TABLE_PRT0214 ) COMPUTE STATISTICS;

ALTER TABLE NRGPC.MY_TABLE SPLIT PARTITION MY_TABLE_DEFAULT AT (TO_DATE('03/01/2014', 'MM/DD/YYYY')) 
    INTO (PARTITION MY_TABLE_PRT0314 TABLESPACE NRGPC_DATA, PARTITION MY_TABLE_DEFAULT ) UPDATE INDEXES;
ANALYZE TABLE NRGPC.MY_TABLE PARTITION (MY_TABLE_PRT0314) COMPUTE STATISTICS;

。。。同样......

OR

2

PCTUSED 40 PCTFREE 20
PARTITION BY RANGE (BUSINESS_DT) 
(  
  PARTITION MY_TABLE_2014_02 VALUES LESS THAN (TO_DATE(' 2014-03-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    TABLESPACE NRGPC_DATA
    PCTFREE 0,  

  PARTITION MY_TABLE_2014_03 VALUES LESS THAN (TO_DATE(' 2014-04-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIAN'))
    TABLESPACE NRGPC_DATA
    PCTFREE 0,

。。。同样......

感谢您的帮助。

Answer 1

如果您已经有默认分区，则需要将其拆分到理想的位置：

SQL> create table t (x date primary key)
  2  partition by range(x) (
  3  partition p_201312 values less than (to_date('20140101','YYYYMMDD')),
  4  partition p_default values less than (maxvalue)
  5  )
  6  /

SQL> alter table t split partition p_default at(to_date('20140201','YYYYMMDD'))
  2  into (partition p_201401, partition p_default)
  3  /

SQL> select partition_name, high_value from user_tab_partitions
  2  where table_name = 'T';

PARTITION_NAME                                                                  
--------------------------------------------------------------------------------
HIGH_VALUE                                                                      
--------------------------------------------------------------------------------
P_201312                                                                        
TO_DATE(' 2014-01-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA

P_201401                                                                        
TO_DATE(' 2014-02-01 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA

P_DEFAULT                                                                       
MAXVALUE

当要描述分区方法和初始分区集时，在CREATE TABLE语句中使用第二个语句。请注意，如果您的默认分区不为空，则可能需要在拆分后重新创建索引（或使用UPDATE INDEXES选项）。

此外，如果要在范围的模块中添加分区（在最小值和最大值之间），则需要拆分最接近分割点的分区而不是默认分区：

SQL> create table t (x int, y int)
  2  partition by range (y) (
  3  partition p_0 values less than(1),
  4  partition p_1 values less than(2),
  5  partition p_2 values less than(3),
  6  partition p_3 values less than(4),
  7  partition p_d values less than(maxvalue)
  8  )
  9  /

SQL> alter table t drop partition p_2
  2  /

SQL> alter table t split partition p_d at(3)
  2  into (partition p_2, partition p_d)
  3  /
alter table t split partition p_d at(3)
                              *
error in line 1:
ORA-14080: Partition cannot be split along the specified high bound



SQL> select partition_name, high_value
  2  from user_tab_partitions where table_name = 'T';

PARTITION_NAME                                                                  
--------------------------------------------------------------------------------
HIGH_VALUE                                                                      
--------------------------------------------------------------------------------
P_0                                                                             
1                                                                               

P_1                                                                             
2                                                                               

P_3                                                                             
4                                                                               

P_D                                                                             
MAXVALUE                                                                        


SQL> alter table t split partition p_3 at(3)
  2  into (partition p_2, partition p_3)
  3  /


SQL> select partition_name, high_value
  2  from user_tab_partitions where table_name = 'T';

PARTITION_NAME                                                                  
--------------------------------------------------------------------------------
HIGH_VALUE                                                                      
--------------------------------------------------------------------------------
P_D                                                                             
MAXVALUE                                                                        

P_3                                                                             
4                                                                               

P_2                                                                             
3                                                                               

P_1                                                                             
2                                                                               

P_0                                                                             
1

使用DATE列在Oracle中对表进行分区

1 个答案: