ORACLE 分区表分区拆分

Posted 2022-12-10 wenxuechaozhe

ORACLE创建分区表，分区规则为按照日期进行分区，由于投产日期未知，因此建议使用按照当前日期自动创建分区。

仅需创建一个max分区，然后通过split进行分区拆分，创建一年前的全部分区。

示例代码如下：

CREATE TABLE WEN
     (DT                DECIMAL(8, 0),
      ID                DECIMAL(12, 0),
      NAME              CHAR(4),
      TS                TIMESTAMP (6))
    PARTITION BY RANGE (DT)
   (PARTITION PMAX values less than (MAXVALUE)) TABLESPACE TBS_WEN;

创建存储过程

CREATE OR REPLACE procedure crt_partition
as  
  ibefore integer := 366;
  iafter integer := 15;
  now integer;
  yestoday integer;
  v_sql1 varchar2(2000);
begin
 for i in 0 .. ibefore loop
   select to_number(to_char(sysdate-ibefore+i,'yyyymmdd')) into now from dual;
   select to_number(to_char(sysdate-ibefore+i-1,'yyyymmdd')) into yestoday from dual;
   v_sql1:='alter table BPTFHIST split partition pmax at ('||now||') into (PARTITION p'||yestoday||',PARTITION pmax)';
   execute immediate v_sql1;
 end loop;
 
 for m in 1 .. iafter loop
   select to_number(to_char(sysdate+m,'yyyymmdd')) into now from dual;
   select to_number(to_char(sysdate+m-1,'yyyymmdd')) into yestoday from dual;
   v_sql1:='alter table WEN split partition pmax at ('||now||') into (PARTITION p'||yestoday||',PARTITION pmax)';
   execute immediate v_sql1;
 end loop;
end;
/

投产日期进行执行存储过程即可

exec crt_partition;

该方式可以无需考虑投产日期进行操作，也同样减少写死一年分区的工作量。