数据库中间隔分区表的删除逻辑

这篇文章主要介绍了数据库中间隔分区表的删除逻辑,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。

企业建站必须是能够以充分展现企业形象为主要目的,是企业文化与产品对外扩展宣传的重要窗口,一个合格的网站不仅仅能为公司带来巨大的互联网上的收集和信息发布平台,创新互联建站面向各种领域:橡塑保温成都网站设计网络营销推广解决方案、网站设计等建站排名服务。


主要讨论如下:
1.间隔分区表的删除逻辑
2.如何处理ORA-14758报错

创建间隔分区
create table t_interval
(
  a DATE,
  b int,
  c int
  )
PARTITION BY RANGE (a)
  INTERVAL (numtodsinterval(3,'day'))
  (
           PARTITION P1 VALUES LESS THAN (TO_DATE('2018-1-2', 'YYYY-MM-DD'))
  );
insert into t_interval values(TO_DATE('2018-01-01 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
insert into t_interval values(TO_DATE('2018-01-02 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
insert into t_interval values(TO_DATE('2018-01-05 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
insert into t_interval values(TO_DATE('2018-01-08 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
insert into t_interval values(TO_DATE('2018-01-11 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
insert into t_interval values(TO_DATE('2018-01-14 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
commit;

09:45:19 SQL>  select PARTITION_NAME,HIGH_VALUE,PARTITION_POSITION,INTERVAL from dba_tab_partitions where table_name='T_INTERVAL';

PARTITION_NAME       HIGH_VALUE                                                                       PARTITION_POSITION INTERVAL
-------------------- -------------------------------------------------------------------------------- ------------------ ---------
P1                   TO_DATE(' 2018-01-02 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  1 NO
SYS_P2876            TO_DATE(' 2018-01-05 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  2 YES
SYS_P2877            TO_DATE(' 2018-01-08 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  3 YES
SYS_P2878            TO_DATE(' 2018-01-11 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  4 YES
SYS_P2879            TO_DATE(' 2018-01-14 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  5 YES
SYS_P2880            TO_DATE(' 2018-01-17 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  6 YES

6 rows selected.
interval列指示分区是否是间隔分区。创建表时指定的分区不属于间隔分区范畴。

更改表的分区间隔
alter table t_interval set interval(NUMTODSINTERVAL(2,'day')); 09:46:57 SQL> select PARTITION_NAME,HIGH_VALUE,PARTITION_POSITION,INTERVAL from dba_tab_partitions where table_name='T_INTERVAL';

PARTITION_NAME       HIGH_VALUE                                                                       PARTITION_POSITION INTERVAL
-------------------- -------------------------------------------------------------------------------- ------------------ ---------
P1                   TO_DATE(' 2018-01-02 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  1 NO
SYS_P2876            TO_DATE(' 2018-01-05 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  2 NO
SYS_P2877            TO_DATE(' 2018-01-08 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  3 NO
SYS_P2878            TO_DATE(' 2018-01-11 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  4 NO
SYS_P2879            TO_DATE(' 2018-01-14 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  5 NO
SYS_P2880            TO_DATE(' 2018-01-17 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  6 NO

6 rows selected.

Elapsed: 00:00:00.00
分区间隔更改之后,interval列都变成了NO。

插入数据产生新分区
insert into t_interval values(TO_DATE('2018-01-18 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
insert into t_interval values(TO_DATE('2018-01-20 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
insert into t_interval values(TO_DATE('2018-01-22 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
insert into t_interval values(TO_DATE('2018-01-24 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
insert into t_interval values(TO_DATE('2018-01-26 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
commit; 09:48:55 SQL> select PARTITION_NAME,HIGH_VALUE,PARTITION_POSITION,INTERVAL from dba_tab_partitions where table_name='T_INTERVAL';

PARTITION_NAME       HIGH_VALUE                                                                       PARTITION_POSITION INTERVAL
-------------------- -------------------------------------------------------------------------------- ------------------ ---------
P1                   TO_DATE(' 2018-01-02 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  1 NO
SYS_P2876            TO_DATE(' 2018-01-05 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  2 NO
SYS_P2877            TO_DATE(' 2018-01-08 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  3 NO
SYS_P2878            TO_DATE(' 2018-01-11 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  4 NO
SYS_P2879            TO_DATE(' 2018-01-14 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  5 NO
SYS_P2880            TO_DATE(' 2018-01-17 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  6 NO
SYS_P2881            TO_DATE(' 2018-01-19 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  7 YES
SYS_P2882            TO_DATE(' 2018-01-21 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  8 YES
SYS_P2883            TO_DATE(' 2018-01-23 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                  9 YES
SYS_P2884            TO_DATE(' 2018-01-25 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                 10 YES
SYS_P2885            TO_DATE(' 2018-01-27 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGORIA                 11 YES

11 rows selected.
新生成的分区属于间隔分区。

尝试删除分区
09:49:26 SQL> alter table t_interval drop partition SYS_P2880;
alter table t_interval drop partition SYS_P2880
                                      *
ERROR at line 1:
ORA-14758: Last partition in the range section cannot be dropped
经过多次尝试之后发现,发现无法删除间隔分区最后一个为NO的分区。

如果一定要删除最后一个为NO的分区的话,那么需要把分区表dba_tab_partitions的interval列都变为NO。
方法很简单,就是指定interval属性为当前值,再执行一遍:
alter table t_interval set interval(NUMTODSINTERVAL(1,'day'));
然后删除
09:55:32 SQL> alter table t_interval drop partition SYS_P2880;

Table altered.

Elapsed: 00:00:00.01
再插入数据产生新的间隔分区
insert into t_interval values(TO_DATE('2018-02-01 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
insert into t_interval values(TO_DATE('2018-02-02 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
insert into t_interval values(TO_DATE('2018-02-03 10:00:00', 'YYYY-MM-DD HH24:MI:SS'),1,1);
commit;

抓取表的ddl

set pagesize 0
set long 90000
select dbms_metadata.get_ddl('TABLE','T_INTERVAL','MING') from dual; 10:35:19 SQL> select dbms_metadata.get_ddl('TABLE','T_INTERVAL','MING') from dual;

 
  CREATE TABLE "MING"."T_INTERVAL"
   (    "A" DATE,
        "B" NUMBER(*,0),
        "C" NUMBER(*,0)
   ) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
  STORAGE(
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CAC
HE DEFAULT)
  TABLESPACE "TBS_MING"
  PARTITION BY RANGE ("A") INTERVAL (NUMTODSINTERVAL(1,'DAY'))
 (PARTITION "SYS_P2877"  VALUES LESS THAN (TO_DATE(' 20
18-01-08 00:00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_C
ALENDAR=GREGORIAN')) SEGMENT CREATION IMMEDIATE
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
 NOCOMPRESS LOGGING
  STORAGE(INITIAL 8388608 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS
2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
  TABLESPACE "TBS_MING" ,
 。。。省略。。。
 PARTITION "SYS_P2890"  VALUES LESS THAN (TO_DATE(' 2018-01-30 00:
00:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREG
ORIAN')) SEGMENT CREATION IMMEDIATE
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
 NOCOMPRESS LOGGING
  STORAGE(INITIAL 8388608 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE
DEFAULT)
  TABLESPACE "TBS_MING" ,
 PARTITION "SYS_P2891"  VALUES LESS THAN (TO_DATE(' 2018-01-31 00:00
:00', 'SYYYY-MM-DD HH24:MI:SS', 'NLS_CALENDAR=GREGOR
IAN')) SEGMENT CREATION IMMEDIATE
  PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
 NOCOMPRESS LOGGING
  STORAGE(INITIAL 8388608 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
  BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DE
FAULT)
  TABLESPACE "TBS_MING" )

会发现间隔分区定义并没有出现在表的ddl定义语句中。当表分区属性interval变为NO后,分区被转变成范围分区,然后才会加入到表的ddl语句中。

1.间隔分区interval为NO的最后一个分区无法删除,都变为NO的时候,则可以删除任意一个分区
2.alter table t_interval set interval命令可以将interval属性都变为NO。
3.间隔分区定义不出现在表的ddl语句中,interval变为NO后,才会加入到表的ddl语句中。

感谢你能够认真阅读完这篇文章,希望小编分享的“数据库中间隔分区表的删除逻辑”这篇文章对大家有帮助,同时也希望大家多多支持创新互联,关注创新互联行业资讯频道,更多相关知识等着你来学习!


当前名称:数据库中间隔分区表的删除逻辑
文章URL:http://azwzsj.com/article/pgppjs.html