创建,增加，删除mysql表分区
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1.测试添加分区和删除分区
###添加删除range分区
(1)创建一个分区：
CREATE TABLE titles (
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 (
'1990-12-31'
),
partition p03 values
less
than (
'1995-12-31'
),
partition p04 values
less
than (
'2000-12-31'
),
partition p05 values
less
than (
'2005-12-31'
),
partition p06 values
less
than (
'2010-12-31'
),
partition p07 values
less
than (
'2015-12-31'
),
partition p08 values
less
than (
'2020-12-31'
),
partition p09 values
less
than (
'2025-12-31'
),
partition p10 values
less
than (
'2030-12-31'
)
);
导入数据
mysql>
source
titles.sql
(2)添加分区：
备注：不能超过p04的范围，严格递增每个分区，即最小不能小于前一个分区
下面新曾了两个分区n01和n02
alter table titles
reorganize partition p04 into(
partition n01 values
less
than(
'1997-12-31'
),
partition n02 values
less
than(
'1998-12-31'
),
partition p04 values
less
than(
'2000-12-31'
)
);
(3)删除分区：
删除分区即删除数据。
mysql>
select
count(*) from titles where from_date<
'1985-12-31'
;
+----------+
| count(*) |
+----------+
| 18238 |
+----------+
1 row
in
set
(0.09 sec)
mysql> alter table titles drop partition p01;
Query OK, 0 rows affected (0.05 sec)
Records: 0 Duplicates: 0 Warnings: 0
mysql>
select
count(*) from titles where from_date<
'1985-12-31'
;
+----------+
| count(*) |
+----------+
| 0 |
+----------+
1 row
in
set
(0.04 sec)
###添加删除list分区
(1)创建list分区
CREATE TABLE titles (
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'
)
);
导入数据
titles.sql 是employees数据库导出的数据
mysql>
source
titles.sql
(2)添加分区
mysql> alter table titles add partition(partition p7 values
in
(
'CEO'
));
Query OK, 0 rows affected (0.07 sec)
Records: 0 Duplicates: 0 Warnings: 0
(3)删除分区：
mysql> alter table titles drop partition p0;
Query OK, 0 rows affected (0.04 sec)
Records: 0 Duplicates: 0 Warnings: 0
###添加删除hash分区
(1)创建
hash
分区
CREATE TABLE titles (
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;
导入数据：
mysql>
source
titles.sql
(2)删除
hash
分区
4个分区减少到两个，4-2=2
mysql> alter table titles coalesce partition 2;
Query OK, 443308 rows affected (12.41 sec)
Records: 443308 Duplicates: 0 Warnings: 0
(3)添加
hash
分区
增加到5个，2+3=5
mysql> alter table titles add partition partitions 3;
Query OK, 443308 rows affected (11.54 sec)
Records: 443308 Duplicates: 0 Warnings: 0
###添加删除key分区
(1)创建key分区
CREATE TABLE titles (
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 key(emp_no)
partitions 4;
导入数据
mysql>
source
titles.sql
(2)删除分区，同
hash
mysql> alter table titles coalesce partition 2;
Query OK, 443308 rows affected (7.86 sec)
Records: 443308 Duplicates: 0 Warnings: 0
(3)添加分区，同
hash
mysql> alter table titles add partition partitions 3;
Query OK, 443308 rows affected (6.17 sec)
Records: 443308 Duplicates: 0 Warnings: 0