表分区是一种思想，分区表示一种技术实现。当表的大小过G的时候可以考虑进行表分区，提高查询效率，均衡IO。oracle分区表是oracle数据库提供的一种表分区的实现形式。表进行分区后，逻辑上仍然是一张表，原来的查询SQL同样生效，同时可以采用使用分区查询来优化SQL查询效率，不至于每次都扫描整个表。
根据年: INTERVAL(NUMTOYMINTERVAL(1,'YEAR'))
根据月: INTERVAL(NUMTOYMINTERVAL(1,'MONTH'))
根据天: INTERVAL(NUMTODSINTERVAL(1,'DAY'))
根据时分秒: NUMTODSINTERVAL( n, { 'DAY'|'HOUR'|'MINUTE'|'SECOND'})
此时已经有普通表了，我创建了含相同字段的分区表，把数据导入到分区表中，再把原表删掉。
-- Create table（WMS_OPERATION_RECORD） create table DPHOMEWMS.WMS_OPERATION_RECORD_TMP ( ID NUMBER(19) not null, WAREHOUSE_ID NUMBER(19), ASN_ID NUMBER(19), PICK_TICKET_ID NUMBER(19), RELATION_CODE VARCHAR2(50), OPERATION_TYPE VARCHAR2(50), OPERATION_ID NUMBER(19), OPERATION_NAME VARCHAR2(50 CHAR), OPERATION_TIME TIMESTAMP(6) DEFAULT systimestamp not null, STATUS VARCHAR2(10), TYPE VARCHAR2(10), COUNTS NUMBER(10) )tablespace DPHOMEWMS_DATA PARTITION BY RANGE (OPERATION_TIME) interval (numtoyminterval(1, 'month')) STORE IN (DPHOMEWMS_DATA) ( partition OPERATION_RECORD_P01 values less than (TIMESTAMP' 2017-05-08 00:00:00') tablespace DPHOMEWMS_DATA ); -- Add comments to the columns comment on column DPHOMEWMS.WMS_OPERATION_RECORD_TMP.WAREHOUSE_ID is '仓库id'; comment on column DPHOMEWMS.WMS_OPERATION_RECORD_TMP.ASN_ID is '收货单id'; comment on column DPHOMEWMS.WMS_OPERATION_RECORD_TMP.PICK_TICKET_ID is '发货单ID'; comment on column DPHOMEWMS.WMS_OPERATION_RECORD_TMP.RELATION_CODE is '关联单据号(收货单或发货单的code)'; comment on column DPHOMEWMS.WMS_OPERATION_RECORD_TMP.OPERATION_TYPE is '操作类型'; comment on column DPHOMEWMS.WMS_OPERATION_RECORD_TMP.OPERATION_ID is '操作人ID'; comment on column DPHOMEWMS.WMS_OPERATION_RECORD_TMP.OPERATION_NAME is '操作人名称'; comment on column DPHOMEWMS.WMS_OPERATION_RECORD_TMP.OPERATION_TIME is '操作时间'; comment on column DPHOMEWMS.WMS_OPERATION_RECORD_TMP.STATUS is '状态'; comment on column DPHOMEWMS.WMS_OPERATION_RECORD_TMP.TYPE is '明细或者统计次数类型'; comment on column DPHOMEWMS.WMS_OPERATION_RECORD_TMP.COUNTS is '统计次数'; --创建本地索引 create index IDX_WMS_OPERATION_RECORD on DPHOMEWMS.WMS_OPERATION_RECORD_TMP(RELATION_CODE) tablespace DPHOMEWMS_INDEX local; update DPHOMEWMS.WMS_OPERATION_RECORD set OPERATION_TIME = sysdate where OPERATION_TIME is null; insert into DPHOMEWMS.WMS_OPERATION_RECORD_TMP select * from WMS_OPERATION_RECORD; drop table DPHOMEWMS.WMS_OPERATION_RECORD; alter table DPHOMEWMS.WMS_OPERATION_RECORD_TMP rename to WMS_OPERATION_RECORD; alter table DPHOMEWMS.WMS_OPERATION_RECORD enable row movement;
（1）OPERATION_TIME是分区键，每一个月会自动创建一个分区，分区键不允许为null。
（2）alter table table_name enable row movement; 是指允许分区表的分区键是可更新，当某一行更新时，如果更新的是分区列，并且更新后的列值不属于原来的这个分区，如果开启了这个选项，就会把这行从这个分区中delete掉，并加到更新后所属的分区，此时就会发生rowid的改变。相当于一个隐式的delete+insert，但是不会触发insert/delete触发器。如果没有开启这个选项，就会在更新时报错。