DB2分区表删除和添加分区

1.数据库版本

2.具体procedure

DROP PROCEDURE DB2USER.TOOLS_PARTITION_TABLE_SHOW (VARCHAR ());

CREATE OR REPLACE PROCEDURE Tools_partition_table_show(IN ETL_DATE VARCHAR(8))
  /******************************************************************************
     NAME:
     PURPOSE:
  
     REVISIONS:
     Ver        Date        Author        Description
     ---------  ----------  ------------  ------------------------------------
     1.0        2015-07-22  Zen        1. 作为分区表添加和快速删除分区的一个示例
                                           供有相同需求的脚本参考。
  ******************************************************************************/
  LANGUAGE SQL
BEGIN
  DECLARE V_LOCATION VARCHAR(100);
  DECLARE V_START_TIME TIMESTAMP;
  DECLARE V_SQLMSG VARCHAR(255);
  DECLARE V_CNT INT;
  DECLARE V_PARTITION_NAME VARCHAR(50);
  DECLARE V_PARTITION_END VARCHAR(50);
  DECLARE EXIT HANDLER FOR SQLEXCEPTION                                                                                        
   BEGIN                                                                                                                     
      GET DIAGNOSTICS EXCEPTION 1 V_SQLMSG = MESSAGE_TEXT;                                                                      
      CALL DB2USER.PRO_LOG(ETL_DATE,'Tools_partition_table_show','测试分区表作业方式',V_START_TIME,current timestamp,'ERROR',V_LOCATION,V_SQLMSG);                                                                            
  END;
  /*清空目标表*/ 
  SET V_START_TIME = current timestamp;
  SET V_LOCATION = '清空数据';
  
  /*
  DELETE FROM DB2USER.S_CLM_RATE_POL_AAA WHERE BBQ = SUBSTR(ETL_DATE,1,6);
  
  COMMIT;*/
  SET V_LOCATION = '测试保单赔率表的抽取开始';
  SET V_PARTITION_NAME = 'P'||SUBSTR(ETL_DATE,1,6);
  SET V_PARTITION_END = TO_CHAR(add_months(TO_DATE(ETL_DATE,'YYYYMMDD'),1),'YYYYMM');
  
  --SELECT TO_CHAR(add_months(TO_DATE(ETL_DATE,'YYYYMMDD'),1),'YYYYMM') INTO V_PARTITION_END FROM sysibm.dual;
  
  --判断分区是否存在，如果存在，数据转出删除
  SELECT COUNT(*) INTO V_CNT FROM syscat.datapartitions t 
    WHERE tabschema='DB2USER' 
    AND tabname='S_CLM_RATE_POL_AAA_TEST'
    AND datapartitionname=V_PARTITION_NAME ;
  
  IF V_CNT=1 THEN     
      -- 分区数据转出
      EXECUTE IMMEDIATE 'ALTER TABLE S_CLM_RATE_POL_AAA_test DETACH PARTITION '||V_PARTITION_NAME||' INTO DB2USER.TEMP_S_CLM_RATE_POL_AAA';
      COMMIT;
      EXECUTE IMMEDIATE 'DROP TABLE DB2USER.TEMP_S_CLM_RATE_POL_AAA';
  END IF ;
  
  SET V_LOCATION = 'after 分区数据转出';
  
  --非正常DML或DDL 需要调用 sysproc.admin_cmd();
  --收集统计信息
  CALL SYSPROC.ADMIN_CMD('RUNSTATS ON TABLE db2user.S_CLM_RATE_POL_AAA_test');
  
  -- 添加新分区
  EXECUTE IMMEDIATE 'ALTER  TABLE  DB2USER.S_CLM_RATE_POL_AAA_test ADD PARTITION '||V_PARTITION_NAME||' STARTING '||SUBSTR(ETL_DATE,1,6)||' INCLUSIVE ENDING '||V_PARTITION_END||' exclusive';
  
  SET V_LOCATION = 'after 添加新分区';
  COMMIT;
  
  EXECUTE IMMEDIATE 'ALTER TABLE DB2USER.S_CLM_RATE_POL_AAA_test ACTIVATE  NOT  LOGGED  INITIALLY';
  
  FOR REC AS WITH TMP(TYPE) AS (SELECT 'AAA1' AS TYPE FROM SYSIBM.DUAL
                          UNION ALL
                          SELECT 'AAA2' AS TYPE  FROM SYSIBM.DUAL
                          UNION ALL
                          SELECT 'AAA4' AS TYPE  FROM SYSIBM.DUAL)
               SELECT * FROM TMP
   DO
   SET V_LOCATION = 'test'||REC.TYPE;
   
   INSERT INTO DB2USER.S_CLM_RATE_POL_AAA_test
   SELECT
      ......END FOR;
   
  CALL DB2USER.PRO_LOG(ETL_DATE,'Tools_partition_table_show','测试分区表作业方式',V_START_TIME,current timestamp,'SUCCESS','','');
END;

3.总结：

a.db2 中表分区目前只支持range分区，没有oracle的丰富。

b.分区不能直接删除必须先 DETACH PARTITION ，detach之后必须commit不然会报结构不完善的错误。

c.需要添加新的分区只需要直接 ADD partition。

d.DDL语句用在procedure中需要显示commit。