mysql测试添加分区和删除分区

##mysql分区
测试添加分区和删除分区
//测试range分区
(1)建立range分区
mysql> CREATE TABLE titles_range
(emp_no      INT NOT NULL,
 title       VARCHAR(50)     NOT NULL,    
 from_date   DATE            NOT NULL,    
 to_date     DATE,    
 KEY         (emp_no),    
 PRIMARY KEY (emp_no,title, from_date)  )
 partition by range columns(from_date)
 (partition p01 values less than ('1985-12-31'),
 partition p02  values less than ('1995-12-31'),
 partition p03 values less than ('2000-12-31'),
 partition p04 values less than ('3000-12-31')  
);

（2）执行计划，查询结果在p01
mysql> explain partitions select * from titles_range where from_date < '1985-12-31';                                                                                                          
 +----+-------------+--------------+------------+------+---------------+------+---------+------+------+-------------+
| id | select_type | table        | partitions | type | possible_keys | key  | key_len | ref  | rows | Extra       |
+----+-------------+--------------+------------+------+---------------+------+---------+------+------+-------------+
|  1 | SIMPLE      | titles_range | p01        | ALL  | NULL          | NULL | NULL    | NULL |    2 | Using where |
+----+-------------+--------------+------------+------+---------------+------+---------+------+------+-------------+
（3）删除p01
mysql> alter table titles_range drop partition p01;  
（4）从新查询 查询结果在p02
mysql> explain partitions select * from titles_range where from_date < '1985-12-31';
+----+-------------+--------------+------------+------+---------------+------+---------+------+------+-------------+
| id | select_type | table        | partitions | type | possible_keys | key  | key_len | ref  | rows | Extra       |
+----+-------------+--------------+------------+------+---------------+------+---------+------+------+-------------+
|  1 | SIMPLE      | titles_range | p02        | ALL  | NULL          | NULL | NULL    | NULL |    2 | Using where |
+----+-------------+--------------+------------+------+---------------+------+---------+------+------+-------------+
（5）添加分区
//添加3001-12-31 比 3000-12-31大的语法
mysql> alter table titles_range add partition(
partition p01 values less than ('3001-12-31')
 PARTITION p6 VALUES LESS THAN MAXVALUE);
//重组p02 reorganize
mysql> alter table titles_range reorganize partition p02 into(partition n0 values less than ('1985-12-31'),partition n1 values less than ('1995-12-31'));
//从新查询1985-12-31
mysql> explain partitions select * from titles_range where from_date < '1985-12-31';
+----+-------------+--------------+------------+------+---------------+------+---------+------+------+-------------+
| id | select_type | table        | partitions | type | possible_keys | key  | key_len | ref  | rows | Extra       |
+----+-------------+--------------+------------+------+---------------+------+---------+------+------+-------------+
|  1 | SIMPLE      | titles_range | n0         | ALL  | NULL          | NULL | NULL    | NULL |    2 | Using where |
+----+-------------+--------------+------------+------+---------------+------+---------+------+------+-------------+
//测试list分区
(1)建立list分区
CREATE TABLE titles_list (
    emp_no      INT NOT NULL,
    title       VARCHAR(50)     NOT NULL,
    from_date   DATE            NOT NULL,
    to_date     DATE,
    KEY         (emp_no),
    PRIMARY KEY (emp_no,title, from_date)
) partition by list columns(title)
(
partition p0 values in ('Assistant Engineer'),
partition p1 values in ('Engineer'),
partition p2 values in ('Manager'),
partition p3 values in ('Senior Engineer'),
partition p4 values in ('Senior Staff'),
partition p5 values in ('Staff'),
partition p6 values in ('Technique Leader')
);
(2）删除p0
mysql> alter table titles_list drop partition p0;  
(3)
//添加分区
mysql> alter table titles_list add partition(partition p0 values in ('Assistant Engineer'));
或者
mysql> alter table titles_list reorganize partition p1 into(partition n0 values in ('Assistant Engineer'),partition n1 values in ('Engineer'));
//测试hash分区
(1)建立hash分区
CREATE TABLE titles_hash (
    emp_no      INT NOT NULL,
    title       VARCHAR(50)     NOT NULL,
    from_date   DATE            NOT NULL,
    to_date     DATE,
    KEY         (emp_no),
    PRIMARY KEY (emp_no,title, from_date)
) partition by hash(emp_no)
partitions 4;
(2)删除分区
mysql> alter table titles_hash coalesce partition 3 ;
（3)添加分区
mysql> alter table titles_hash add partition partitions 3 ;
//测试key分区
(1)建立key分区
CREATE TABLE titles_key(
    emp_no      INT NOT NULL,
    title       VARCHAR(50)     NOT NULL,
    from_date   DATE            NOT NULL,
    to_date     DATE,
    KEY         (emp_no),
    PRIMARY KEY (emp_no,title, from_date)
) partition by hash(emp_no)
partitions 4;
(2)删除分区
mysql> alter table titles_key coalesce partition 3 ;

（3)添加分区
mysql> alter table titles_key add partition partitions 3 ;