mysql> CREATE TABLE test (id int(11) DEFAULT NULL,uname varchar(50) DEFAULT NULL,create_date date NOT NULL DEFAULT '1970-01-01'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
/*!50500 PARTITION BY RANGE COLUMNS(create_date)
(PARTITION p0 VALUES LESS THAN ('2018-1-1',
PARTITION p1 VALUES LESS THAN ('2019-1-1') ENGINE = InnoDB;
mysql> select * from information_schema.partitions where table_schema='test' and table_name='test'\G
1. row
TABLE_CATALOG: def
TABLE_SCHEMA: test
TABLE_NAME: test
PARTITION_NAME: p0
SUBPARTITION_NAME: NULL
PARTITION_ORDINAL_POSITION: 1
SUBPARTITION_ORDINAL_POSITION: NULL
PARTITION_METHOD: RANGE COLUMNS
SUBPARTITION_METHOD: NULL
PARTITION_EXPRESSION: create_date
SUBPARTITION_EXPRESSION: NULL
PARTITION_DESCRIPTION: '2018-1-1'
TABLE_ROWS: 2
AVG_ROW_LENGTH: 8192
DATA_LENGTH: 16384
MAX_DATA_LENGTH: 0
INDEX_LENGTH: 0
DATA_FREE: 0
CREATE_TIME: 2019-01-01 16:03:02
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: test
PARTITION_NAME: p1
SUBPARTITION_NAME: NULL
PARTITION_ORDINAL_POSITION: 2
SUBPARTITION_ORDINAL_POSITION: NULL
PARTITION_METHOD: RANGE COLUMNS
SUBPARTITION_METHOD: NULL
PARTITION_EXPRESSION: create_date
SUBPARTITION_EXPRESSION: NULL
PARTITION_DESCRIPTION: '2019-1-1'
TABLE_ROWS: 1
AVG_ROW_LENGTH: 16384
DATA_LENGTH: 16384
MAX_DATA_LENGTH: 0
INDEX_LENGTH: 0
DATA_FREE: 0
CREATE_TIME: 2019-01-01 16:03:02
UPDATE_TIME: 2019-01-01 16:03:58
CHECK_TIME: NULL
CHECKSUM: NULL
PARTITION_COMMENT:
NODEGROUP: default
TABLESPACE_NAME: NULL
2 rows in set (0.00 sec)
mysql> show create table test;
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| test | CREATE TABLE test (id int(11) DEFAULT NULL,uname varchar(50) DEFAULT NULL,create_date date NOT NULL DEFAULT '1970-01-01'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
/!50500 PARTITION BY RANGE COLUMNS(create_date)
(PARTITION p0 VALUES LESS THAN ('2018-1-1') ENGINE = InnoDB,
PARTITION p1 VALUES LESS THAN ('2019-1-1') ENGINE = InnoDB) / |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)
mysql> alter table test add partition(partition paaa values less than maxvalue);
Query OK, 0 rows affected (0.10 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> show create table test;
+-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| test | CREATE TABLE test (id int(11) DEFAULT NULL,uname varchar(50) DEFAULT NULL,create_date date NOT NULL DEFAULT '1970-01-01'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
/!50500 PARTITION BY RANGE COLUMNS(create_date)
(PARTITION p0 VALUES LESS THAN ('2018-1-1') ENGINE = InnoDB,
PARTITION p1 VALUES LESS THAN ('2019-1-1') ENGINE = InnoDB,
PARTITION paaa VALUES LESS THAN (MAXVALUE) ENGINE = InnoDB) / |
+-------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)
mysql> alter table test add partition(partition p2 values less than('2019-2-1'));
出現以下錯誤，說明只能從最大的partition 後開始添加，因爲partiton paaa 的值是最大值，所以會出現錯誤
ERROR 1493 (HY000): VALUES LESS THAN value must be strictly increasing for each partition
#將最大的分區，拆分爲其它分區
mysql> alter table test reorganize partition paaa into(partition p2 values less than('2019-2-1'),partition p3 values less than maxvalue);
Query OK, 0 rows affected (0.08 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql> show create table test;
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| test | CREATE TABLE test (id int(11) DEFAULT NULL,uname varchar(50) DEFAULT NULL,create_date date NOT NULL DEFAULT '1970-01-01'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
/!50500 PARTITION BY RANGE COLUMNS(create_date)
(PARTITION p0 VALUES LESS THAN ('2018-1-1') ENGINE = InnoDB,
PARTITION p1 VALUES LESS THAN ('2019-1-1') ENGINE = InnoDB,
PARTITION p2 VALUES LESS THAN ('2019-2-1') ENGINE = InnoDB,
PARTITION p3 VALUES LESS THAN (MAXVALUE) ENGINE = InnoDB) / |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
mysql> insert into test(id,uname,create_date)values(2,'aaa','2019-2-2');
Query OK, 1 row affected (0.04 sec)
mysql> insert into test(id,uname,create_date)values(2,'aaa','2019-3-1');
Query OK, 1 row affected (0.09 sec)
mysql> select count(1) from test;
+----------+
| count(1) |
+----------+
| 6 |
+----------+
1 row in set (0.00 sec)
mysql> checksum table test;
+-----------+------------+
| Table | Checksum |
+-----------+------------+
| test.test | 1892330486 |
+-----------+------------+
1 row in set (0.01 sec)
mysql> explain select * from test where create_date='2018-3-1';
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| 1 | SIMPLE | test | p1 | ALL | NULL | NULL | NULL | NULL | 1 | 100.00 | Using where |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.01 sec)
mysql> explain select * from test where create_date='2018-2-2';
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| 1 | SIMPLE | test | p1 | ALL | NULL | NULL | NULL | NULL | 1 | 100.00 | Using where |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)
mysql> explain select * from test where create_date='2018-2-1';
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| 1 | SIMPLE | test | p1 | ALL | NULL | NULL | NULL | NULL | 1 | 100.00 | Using where |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)
mysql> explain select * from test where create_date='2018-2-1';
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| 1 | SIMPLE | test | p1 | ALL | NULL | NULL | NULL | NULL | 1 | 100.00 | Using where |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.01 sec)
mysql> explain select * from test where create_date='2018-1-1';
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| 1 | SIMPLE | test | p1 | ALL | NULL | NULL | NULL | NULL | 1 | 100.00 | Using where |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)
mysql> select * from test;
+------+-------+-------------+
| id | uname | create_date |
+------+-------+-------------+
| 1 | aaaa | 2017-12-10 |
| 1 | aaaa | 2017-01-01 |
| 2 | aaa | 2018-10-02 |
| 2 | aaa | 2019-01-02 |
| 2 | aaa | 2019-02-02 |
| 2 | aaa | 2019-03-01 |
+------+-------+-------------+
6 rows in set (0.00 sec)
mysql> explain select * from test where create_date='2019-2-1';
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| 1 | SIMPLE | test | p3 | ALL | NULL | NULL | NULL | NULL | 2 | 50.00 | Using where |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)
mysql> checksum table test;
+-----------+------------+
| Table | Checksum |
+-----------+------------+
| test.test | 1892330486 |
+-----------+------------+
1 row in set (0.00 sec)
#合併分區到一個分區
mysql> alter table test reorganize partition p1,p2,p3 into(partition p3 values less than maxvalue);
mysql> explain select * from test where create_date='2019-1-1';
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
| 1 | SIMPLE | test | p3 | ALL | NULL | NULL | NULL | NULL | 1 | 100.00 | Using where |
+----+-------------+-------+------------+------+---------------+------+---------+------+------+----------+-------------+
1 row in set, 1 warning (0.00 sec)
mysql> show create table test;
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| test | CREATE TABLE test (id int(11) DEFAULT NULL,uname varchar(50) DEFAULT NULL,create_date date NOT NULL DEFAULT '1970-01-01'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
/!50500 PARTITION BY RANGE COLUMNS(create_date)
(PARTITION p0 VALUES LESS THAN ('2018-1-1') ENGINE = InnoDB,
PARTITION p3 VALUES LESS THAN (MAXVALUE) ENGINE = InnoDB) / |
+-------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
再一次做拆分
mysql> alter table test reorganize partition p3 into(partition p1 values less than ('2019-1-1'),partition p2 values less than('2019-2-1'),partition p3 values less than maxvalue);
mysql> show create table test;
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table | Create Table |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| test | CREATE TABLE test (id int(11) DEFAULT NULL,uname varchar(50) DEFAULT NULL,create_date date NOT NULL DEFAULT '1970-01-01'
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
/!50500 PARTITION BY RANGE COLUMNS(create_date)
(PARTITION p0 VALUES LESS THAN ('2018-1-1') ENGINE = InnoDB,
PARTITION p1 VALUES LESS THAN ('2019-1-1') ENGINE = InnoDB,
PARTITION p2 VALUES LESS THAN ('2019-2-1') ENGINE = InnoDB,
PARTITION p3 VALUES LESS THAN (MAXVALUE) ENGINE = InnoDB) / |
+-------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
刪除分區，會刪除在該分區的數據
mysql> alter table test drop partition p2;
mysql> select * from test;
+------+-------+-------------+
| id | uname | create_date |
+------+-------+-------------+
| 1 | aaaa | 2017-12-10 |
| 1 | aaaa | 2017-01-01 |
| 2 | aaa | 2018-10-02 |
| 2 | aaa | 2019-02-02 |
| 2 | aaa | 2019-03-01 |
+------+-------+-------------+