oracle 组合分区
CREATETABLE t_range_hash
(object_id NUMBER(5),
object_name VARCHAR2(50),
create_date DATE,
OBJECT_TYPE VARCHAR2(20))
PARTITIONBYRANGE(object_id) subpartitionbyhash(OBJECT_TYPE)
SUBPARTITIONS4
(
PARTITIONobject_id_10000 VALUESLESSTHAN (10000),
PARTITIONobject_id_20000 VALUESLESSTHAN (20000),
PARTITIONobject_id_30000 VALUESLESSTHAN (30000),
PARTITIONobject_id_40000 VALUESLESSTHAN (40000),
PARTITIONobject_id_50000 VALUESLESSTHAN (50000),
PARTITIONobject_id_60000 VALUESLESSTHAN (60000),
PARTITIONobject_id_max VALUESLESSTHAN (MAXVALUE)
)
现实中的应用：对时间字段按范围进行分区后每个分区的记录数仍然很多，可以按很少重复的列进行hash分区，这个可以使子分区的记录数目比较平衡
CREATETABLE t_range_list
(object_id NUMBER(5),
object_name VARCHAR2(50),
create_date DATE,
OBJECT_TYPE VARCHAR2(20))
PARTITIONBYRANGE(object_id) subpartitionbylist(OBJECT_TYPE)
SUBPARTITIONSTEMPLATE(
PARTITIONt_list_synonym VALUES('SYNONYM') ,
PARTITIONt_list_javaclass VALUES('JAVA CLASS'),
PARTITIONt_list_other VALUES(DEFAULT)
)
(
PARTITIONobject_id_10000 VALUESLESSTHAN (10000),
PARTITIONobject_id_20000 VALUESLESSTHAN (20000),
PARTITIONobject_id_30000 VALUESLESSTHAN (30000),
PARTITIONobject_id_40000 VALUESLESSTHAN (40000),
PARTITIONobject_id_50000 VALUESLESSTHAN (50000),
PARTITIONobject_id_60000 VALUESLESSTHAN (60000),
PARTITIONobject_id_max VALUESLESSTHAN (MAXVALUE)
)
)
现实中的应用：对时间字段按范围进行分区后每个分区的记录数仍然很多，可以按照某个重复性比较高的类型进行list，比如员工的部门，这样可以使子分区的记录数变少并且有明显的业务含义，方面查询
CREATETABLE t_range_range
(object_id NUMBER(5),
object_name VARCHAR2(50),
create_date DATE,
OBJECT_TYPE VARCHAR2(20))
PARTITIONBYRANGE(object_id) subpartitionbyhash(OBJECT_TYPE)
SUBPARTITIONS4
(
PARTITIONobject_id_10000 VALUESLESSTHAN (10000),
PARTITIONobject_id_20000 VALUESLESSTHAN (20000),
PARTITIONobject_id_30000 VALUESLESSTHAN (30000),
PARTITIONobject_id_40000 VALUESLESSTHAN (40000),
PARTITIONobject_id_50000 VALUESLESSTHAN (50000),
PARTITIONobject_id_60000 VALUESLESSTHAN (60000),
PARTITIONobject_id_max VALUESLESSTHAN (MAXVALUE)
)
现实中的应用：对时间字段按年进行分区后每个分区的记录数仍然很多，可以按照月再进行range分区
CREATETABLE t_list_hash
(object_id NUMBER(5),
object_name VARCHAR2(50),
create_date DATE,
OBJECT_TYPE VARCHAR2(20))
PARTITIONBYLIST(OBJECT_TYPE) subpartitionbyHASH(OBJECT_id)
SUBPARTITIONS4
(
PARTITIONt_list_synonym VALUES('SYNONYM') ,
PARTITIONt_list_javaclass VALUES('JAVA CLASS'),
PARTITIONt_list_other VALUES(DEFAULT)
)
现实中的应用：如已经按部门进行分区了，可是子分区的记录仍然很多，为了均匀分布数据，可以用员工的id或者其他区别性比较强的字段进行hash分区
CREATETABLE t_list_list
(object_id NUMBER(5),
object_name VARCHAR2(50),
create_date DATE,
OBJECT_TYPE VARCHAR2(20))
PARTITIONBYLIST(OBJECT_TYPE) subpartitionbylist(OBJECT_NAME)
SUBPARTITIONSTEMPLATE(
PARTITIONt_list_TABLE VALUES('TABLE') ,
PARTITIONt_list_INDEX VALUES('INDEX'),
PARTITIONt_list_other VALUES(DEFAULT)
)
(
PARTITIONt_list_synonym VALUES('SYNONYM') ,
PARTITIONt_list_javaclass VALUES('JAVA CLASS'),
PARTITIONt_list_other VALUES(DEFAULT)
)
现实中的应用：如已经按部门进行分区了，可是子分区的记录仍然很多，业务上经常查询部门下每个项目组的信息，就可以按项目组进行list分区
CREATETABLE t_list_range
(object_id NUMBER(5),
object_name VARCHAR2(50),
create_date DATE,
OBJECT_TYPE VARCHAR2(20))
PARTITIONBYLIST(OBJECT_TYPE) subpartitionbylist(OBJECT_id)
SUBPARTITIONSTEMPLATE(
PARTITIONobject_id_10000 VALUESLESSTHAN (10000),
PARTITIONobject_id_20000 VALUESLESSTHAN (20000),
PARTITIONobject_id_30000 VALUESLESSTHAN (30000),
PARTITIONobject_id_40000 VALUESLESSTHAN (40000),
PARTITIONobject_id_50000 VALUESLESSTHAN (50000),
PARTITIONobject_id_60000 VALUESLESSTHAN (60000),
PARTITIONobject_id_max VALUESLESSTHAN (MAXVALUE)
)
(
PARTITIONt_list_synonym VALUES('SYNONYM') ,
PARTITIONt_list_javaclass VALUES('JAVA CLASS'),
PARTITIONt_list_other VALUES(DEFAULT)
)
现实中的应用：这个应用场景和range-list比较像，要看具体的业务，如已经按部门进行分区了，可是子分区的记录仍然很多，业务上经常查询某个时间段的信息就可以按时间range分区。