mysql分区举例---子分区
mysql允许RANGE和LIST分区上再进行HASH和KEY的子分区
mysql> create table ts(a int,b date)
-> partition by range(year(b))
-> subpartition by hash(TO_DAYS(b))
-> subpartitions 2(
-> partition p0 values less than (1990),
-> partition p1 values less than (2000),
-> partition p2 values less than maxvalue
-> );
Query OK, 0 rows affected (0.89 sec)
产生6个分区，3*2=6
mysql> select * from information_schema.partitions
-> where table_schema=database() and
-> table_name='ts'\G;
*************************** 1. row ***************************
TABLE_CATALOG: def
TABLE_SCHEMA: test
TABLE_NAME: ts
PARTITION_NAME: p0
SUBPARTITION_NAME: p0sp0
PARTITION_ORDINAL_POSITION: 1
SUBPARTITION_ORDINAL_POSITION: 1
PARTITION_METHOD: RANGE
SUBPARTITION_METHOD: HASH
PARTITION_EXPRESSION: year(b)
SUBPARTITION_EXPRESSION: TO_DAYS(b)
PARTITION_DESCRIPTION: 1990
TABLE_ROWS: 0
AVG_ROW_LENGTH: 0
DATA_LENGTH: 16384
MAX_DATA_LENGTH: NULL
INDEX_LENGTH: 0
DATA_FREE: 0
CREATE_TIME: NULL
UPDATE_TIME: NULL
CHECK_TIME: NULL
CHECKSUM: NULL
PARTITION_COMMENT:
NODEGROUP: default
TABLESPACE_NAME: NULL
*************************** 2. row ***************************
TABLE_CATALOG: def
TABLE_SCHEMA: test
TABLE_NAME: ts
PARTITION_NAME: p0
SUBPARTITION_NAME: p0sp1
PARTITION_ORDINAL_POSITION: 1
SUBPARTITION_ORDINAL_POSITION: 2
PARTITION_METHOD: RANGE
SUBPARTITION_METHOD: HASH
PARTITION_EXPRESSION: year(b)
SUBPARTITION_EXPRESSION: TO_DAYS(b)
PARTITION_DESCRIPTION: 1990
TABLE_ROWS: 0
AVG_ROW_LENGTH: 0
DATA_LENGTH: 16384
MAX_DATA_LENGTH: NULL
INDEX_LENGTH: 0
DATA_FREE: 0
CREATE_TIME: NULL
UPDATE_TIME: NULL
CHECK_TIME: NULL
CHECKSUM: NULL
PARTITION_COMMENT:
NODEGROUP: default
TABLESPACE_NAME: NULL
*************************** 3. row ***************************
TABLE_CATALOG: def
TABLE_SCHEMA: test
TABLE_NAME: ts
PARTITION_NAME: p1
SUBPARTITION_NAME: p1sp0
PARTITION_ORDINAL_POSITION: 2
SUBPARTITION_ORDINAL_POSITION: 1
PARTITION_METHOD: RANGE
SUBPARTITION_METHOD: HASH
PARTITION_EXPRESSION: year(b)
SUBPARTITION_EXPRESSION: TO_DAYS(b)
PARTITION_DESCRIPTION: 2000
TABLE_ROWS: 0
AVG_ROW_LENGTH: 0
DATA_LENGTH: 16384
MAX_DATA_LENGTH: NULL
INDEX_LENGTH: 0
DATA_FREE: 0
CREATE_TIME: NULL
UPDATE_TIME: NULL
CHECK_TIME: NULL
CHECKSUM: NULL
PARTITION_COMMENT:
NODEGROUP: default
TABLESPACE_NAME: NULL
*************************** 4. row ***************************
TABLE_CATALOG: def
TABLE_SCHEMA: test
TABLE_NAME: ts
PARTITION_NAME: p1
SUBPARTITION_NAME: p1sp1
PARTITION_ORDINAL_POSITION: 2
SUBPARTITION_ORDINAL_POSITION: 2
PARTITION_METHOD: RANGE
SUBPARTITION_METHOD: HASH
PARTITION_EXPRESSION: year(b)
SUBPARTITION_EXPRESSION: TO_DAYS(b)
PARTITION_DESCRIPTION: 2000
TABLE_ROWS: 0
AVG_ROW_LENGTH: 0
DATA_LENGTH: 16384
MAX_DATA_LENGTH: NULL
INDEX_LENGTH: 0
DATA_FREE: 0
CREATE_TIME: NULL
UPDATE_TIME: NULL
CHECK_TIME: NULL
CHECKSUM: NULL
PARTITION_COMMENT:
NODEGROUP: default
TABLESPACE_NAME: NULL
*************************** 5. row ***************************
TABLE_CATALOG: def
TABLE_SCHEMA: test
TABLE_NAME: ts
PARTITION_NAME: p2
SUBPARTITION_NAME: p2sp0
PARTITION_ORDINAL_POSITION: 3
SUBPARTITION_ORDINAL_POSITION: 1
PARTITION_METHOD: RANGE
SUBPARTITION_METHOD: HASH
PARTITION_EXPRESSION: year(b)
SUBPARTITION_EXPRESSION: TO_DAYS(b)
PARTITION_DESCRIPTION: MAXVALUE
TABLE_ROWS: 0
AVG_ROW_LENGTH: 0
DATA_LENGTH: 16384
MAX_DATA_LENGTH: NULL
INDEX_LENGTH: 0
DATA_FREE: 0
CREATE_TIME: NULL
UPDATE_TIME: NULL
CHECK_TIME: NULL
CHECKSUM: NULL
PARTITION_COMMENT:
NODEGROUP: default
TABLESPACE_NAME: NULL
*************************** 6. row ***************************
TABLE_CATALOG: def
TABLE_SCHEMA: test
TABLE_NAME: ts
PARTITION_NAME: p2
SUBPARTITION_NAME: p2sp1
PARTITION_ORDINAL_POSITION: 3
SUBPARTITION_ORDINAL_POSITION: 2
PARTITION_METHOD: RANGE
SUBPARTITION_METHOD: HASH
PARTITION_EXPRESSION: year(b)
SUBPARTITION_EXPRESSION: TO_DAYS(b)
PARTITION_DESCRIPTION: MAXVALUE
TABLE_ROWS: 0
AVG_ROW_LENGTH: 0
DATA_LENGTH: 16384
MAX_DATA_LENGTH: NULL
INDEX_LENGTH: 0
DATA_FREE: 0
CREATE_TIME: NULL
UPDATE_TIME: NULL
CHECK_TIME: NULL
CHECKSUM: NULL
PARTITION_COMMENT:
NODEGROUP: default
TABLESPACE_NAME: NULL
6 rows in set (0.02 sec)
第二种方式：
CREATE TABLE ts2 (
a int(11) DEFAULT NULL,
b date DEFAULT NULL
)
PARTITION BY RANGE (year(b))
SUBPARTITION BY HASH (to_days(b))
(PARTITION p0 VALUES LESS THAN (1990)
(SUBPARTITION s0 ,
SUBPARTITION s1 ),
PARTITION p1 VALUES LESS THAN (2000)
(SUBPARTITION s2 ,
SUBPARTITION s3 ),
PARTITION p2 VALUES LESS THAN MAXVAlUE
(SUBPARTITION s4 ,
SUBPARTITION s5 ));
几条SQL:
1.create table ts3 like ts2;
建立ts3表和ts2一模一样
2.alter table ts3 drop partition p0;
删除ts3表的p0分区
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