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 tableDPHOMEWMS.WMS_OPERATION_RECORD_TMP

(

IDNUMBER(19) not null,

WAREHOUSE_IDNUMBER(19),

ASN_IDNUMBER(19),

PICK_TICKET_IDNUMBER(19),

RELATION_CODEVARCHAR2(50),

OPERATION_TYPEVARCHAR2(50),

OPERATION_IDNUMBER(19),

OPERATION_NAMEVARCHAR2(50 CHAR),

OPERATION_TIMETIMESTAMP(6) DEFAULT systimestamp not null,

STATUSVARCHAR2(10),

TYPEVARCHAR2(10),

COUNTSNUMBER(10)

)tablespace DPHOMEWMS_DATA

PARTITIONBY RANGE (OPERATION_TIME) interval (numtoyminterval(1, 'month'))

STOREIN(DPHOMEWMS_DATA)

(

partition OPERATION_RECORD_P01values less than (TIMESTAMP'2017-05-08 00:00:00')

tablespace DPHOMEWMS_DATA

);--Add comments to the columns

comment on columnDPHOMEWMS.WMS_OPERATION_RECORD_TMP.WAREHOUSE_IDis '仓库id';

commenton columnDPHOMEWMS.WMS_OPERATION_RECORD_TMP.ASN_IDis '收货单id';

commenton columnDPHOMEWMS.WMS_OPERATION_RECORD_TMP.PICK_TICKET_IDis '发货单ID';

commenton columnDPHOMEWMS.WMS_OPERATION_RECORD_TMP.RELATION_CODEis '关联单据号(收货单或发货单的code)';

commenton columnDPHOMEWMS.WMS_OPERATION_RECORD_TMP.OPERATION_TYPEis '操作类型';

commenton columnDPHOMEWMS.WMS_OPERATION_RECORD_TMP.OPERATION_IDis '操作人ID';

commenton columnDPHOMEWMS.WMS_OPERATION_RECORD_TMP.OPERATION_NAMEis '操作人名称';

commenton columnDPHOMEWMS.WMS_OPERATION_RECORD_TMP.OPERATION_TIMEis '操作时间';

commenton columnDPHOMEWMS.WMS_OPERATION_RECORD_TMP.STATUSis '状态';

commenton columnDPHOMEWMS.WMS_OPERATION_RECORD_TMP.TYPEis '明细或者统计次数类型';

commenton columnDPHOMEWMS.WMS_OPERATION_RECORD_TMP.COUNTSis '统计次数';--创建本地索引

create index IDX_WMS_OPERATION_RECORD onDPHOMEWMS.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 * fromWMS_OPERATION_RECORD;drop tableDPHOMEWMS.WMS_OPERATION_RECORD;alter table DPHOMEWMS.WMS_OPERATION_RECORD_TMP rename toWMS_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。