Postgresql分区表

PostgreSQL 提供了三种分区表实现方式：

range ：范围分区
list ：列表分区
hash ：哈希分区

一、范围分区

根据某个字段的值，将数据存入不同的分区表中。

创建父表

create table test_person_table
(
    name varchar(64),
    age  int
) partition by range (age);

根据age 字段进行范围分区

创建分区表

create table test_person_table_r1 partition of test_person_table for values from (minvalue )to(10);
create table test_person_table_r2 partition of test_person_table for values from (11 )to(20);
create table test_person_table_r3 partition of test_person_table for values from (21 )to(30);
create table test_person_table_r4 partition of test_person_table for values from (31 )to(40);
create table test_person_table_r5 partition of test_person_table for values from (41 )to(maxvalue );

第一个分区表，范围是从最小值到10
最后一个分区表，范围是从41到最大值
如果插入的数值，没有分区能够覆盖，则会报错

父表和分区表都创建成功：

插入数据

insert into test_person_table (name, age) values ('xiaoxiao1', 5);
insert into test_person_table (name, age) values ('xiaoxiao2', 15);
insert into test_person_table (name, age) values ('xiaoxiao3', 25);
insert into test_person_table (name, age) values ('xiaoxiao4', 35);
insert into test_person_table (name, age) values ('xiaoxiao5', 45);

查询数据
- 查询父表
- 查询分区表

二、列表分区

创建父表

create table test_table_partition_by_list
(
    name varchar(64),
    city varchar(64)
)partition by list(city);

按照city 字段进行分区

创建分区表

create table test_table_partition_by_list_sichuan partition of test_table_partition_by_list for values in ('成都','绵阳');
create table test_table_partition_by_list_guangdong partition of test_table_partition_by_list for values in ('广州', '深圳');
create table test_table_partition_by_list_other partition of test_table_partition_by_list default ;

插入数据

insert into test_table_partition_by_list (name, city) values ('xiaoxiao1', '成都');
insert into test_table_partition_by_list (name, city) values ('xiaoxiao2', '绵阳');
insert into test_table_partition_by_list (name, city) values ('xiaoxiao3', '广州');
insert into test_table_partition_by_list (name, city) values ('xiaoxiao4', '深圳');
insert into test_table_partition_by_list (name, city) values ('xiaoxiao5', '北京');

查询数据
- 父表
- 分区表

三、哈希分区

创建父表

create table test_table_partition_by_hash(
    name varchar(64),
    city varchar(64)
)partition by hash (city);

按照city的hash值进行分区

创建分区表

create table test_table_partition_by_hash_h1 partition of test_table_partition_by_hash for values with (modulus 3, remainder 0);
create table test_table_partition_by_hash_h2 partition of test_table_partition_by_hash for values with (modulus 3, remainder 1);
create table test_table_partition_by_hash_h3 partition of test_table_partition_by_hash for values with (modulus 3, remainder 2);

插入数据

insert into test_table_partition_by_hash (name, city) values ('xiaoxiao1', 'chengdu');
insert into test_table_partition_by_hash (name, city) values ('xiaoxiao2', 'chengdu');

insert into test_table_partition_by_hash (name, city) values ('xiaoxiao3', 'guangzhou');
insert into test_table_partition_by_hash (name, city) values ('xiaoxiao4', 'guangzhou');

insert into test_table_partition_by_hash (name, city) values ('xiaoxiao5', 'shenzhen');
insert into test_table_partition_by_hash (name, city) values ('xiaoxiao6', 'shanghai');
insert into test_table_partition_by_hash (name, city) values ('xiaoxiao7', 'beijing');