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分类: LINUX
2010-11-21 15:19:07
Range partitioning is a technique where ranges of data is stored separately in different sub-tables.
MAXVALUE is provided as a catch-all for values that exceed all ranges specified. Note that Oracle sorts greater than all other values, except MAXVALUE.
Range partitioning was introduced in .
Partition on a numeric value range:
CREATE TABLE emp ( empno NUMBER(4), ename VARCHAR2(30), sal NUMBER ) PARTITION BY RANGE(empno) ( partition e1 values less than (1000) tablespace ts1, partition e2 values less than (2000) tablespace ts2, partition e3 values less than (MAXVALUE) tablespace ts3 );
Partition on a VARCHAR2 string:
CREATE TABLE emp ( id NUMBER(5) PRIMARY KEY, name VARCHAR2(50) NOT NULL, phone VARCHAR2(15), email VARCHAR2(100) ) PARTITION BY RANGE ( name ) ( PARTITION p1 VALUES LESS THAN ('L') TABLESPACE ts1, PARTITION p2 VALUES LESS THAN (MAXVALUE) TABLESPACE ts2 )
Time based range partitioning:
CREATE TABLE t1 (id NUMBER, c1 DATE) PARTITION BY RANGE (c1) (PARTITION t1p1 VALUES LESS THAN (TO_DATE('2007-11-01', 'YYYY-MM-DD')), PARTITION t1p2 VALUES LESS THAN (TO_DATE('2007-12-01', 'YYYY-MM-DD')), PARTITION t1p3 VALUES LESS THAN (TO_DATE('2008-01-01', 'YYYY-MM-DD')), PARTITION t1p4 VALUES LESS THAN (MAXVALUE) );