把非分区表改为分区表

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把非分区表改为分区表

--说明：把非分区表改为分区表适用于历史表
---1、创建分区表（结构和非分区表TBL_STOCK_BALANCE_LOG相同）
CREATE TABLE TBL_STOCK_BALANCE_LOG_PART1
(
ACCOUNT_ID       VARCHAR2(20 BYTE),
OCCUR_DATE       DATE,
BRANCH_ID        NUMBER(10),
MONEY_TYPE       VARCHAR2(10 BYTE),
MONEY_TYPE_NAME VARCHAR2(20 BYTE),
MARKET_CODE      VARCHAR2(10 BYTE),
MARKET_NAME      VARCHAR2(30 BYTE),
STOCK_CODE       VARCHAR2(10 BYTE),
STOCK_NAME       VARCHAR2(60 BYTE),
STOCK_TYPE_CODE VARCHAR2(40 BYTE),
STOCK_TYPE_NAME VARCHAR2(60 BYTE),
QTY             NUMBER(18),
STOCKVALUE       NUMBER(18,4),
INDUST_NUM       VARCHAR2(20 BYTE),
CLOSE_PRICE      NUMBER(18,4),
ASSET_ACCT       NUMBER(18,4),
REFER_COST       NUMBER(18,4),
REFER_BREAK      NUMBER(18,4),
REFER_BREAK_RA   NUMBER(18,4),
INDUST_ID        VARCHAR2(20 BYTE),
DEPTID          VARCHAR2(10 BYTE)
)
Partition by range (OCCUR_DATE)
(
partition p_other values less than (maxvalue)
);

---2、交换数据（数据从非分区表到分区表）
alter table TBL_STOCK_BALANCE_LOG_PART1 exchange partition p_other with tableTBL_STOCK_BALANCE_LOG;
---SELECT * FROM TBL_STOCK_BALANCE_LOG_PART1;

---3、查询分区表数据
select to_char(OCCUR_DATE, 'YYYY-MM'), count(*) fromTBL_STOCK_BALANCE_LOG_PART1 group by to_char(OCCUR_DATE, 'YYYY-MM');

---辅助脚本
select
'alter table TBL_STOCK_BALANCE_LOG_PART1 split partition p_other at(to_date('''||to_char(OCCUR_DATE,'yyyy-mm')||''',''yyyy-mm'')) into (partitionp'||to_char(OCCUR_DATE,'yyyymm')|| ',partition p_other);'
from TBL_STOCK_BALANCE_LOG_PART1
group by to_char(OCCUR_DATE,'yyyy-mm'),to_char(OCCUR_DATE,'yyyymm')
order by to_char(OCCUR_DATE,'yyyymm')

---执行脚本生成语句
alter table TBL_STOCK_BALANCE_LOG_PART1 split partition p_other at(to_date('2011-08','yyyy-mm'))
into (partition p201108,partition p_other);
alter table TBL_STOCK_BALANCE_LOG_PART1 split partition p_other at(to_date('2011-09','yyyy-mm'))
into (partition p201109,partition p_other);

---4、删除非分区表
DROP TABLE TBL_STOCK_BALANCE_LOG PURGE;
---5、将分区表重命名为原分区表名
ALTER TABLE TBL_STOCK_BALANCE_LOG_PART1 RENAME TO TBL_STOCK_BALANCE_LOG;
---6、测试
select table_name, partition_name from user_tab_partitions where table_name ='TBL_STOCK_BALANCE_LOG';
select COUNT(*) from TBL_STOCK_BALANCE_LOG partition(P201109)