postgresql partition分表的总结

Posted 2022-12-01 Agent-C

postgre分表有两种方式

10版本以前仅继承分表
10版本以后支持内置分区分表

内置分表

主表创建的索引会传递到子表
内置分表有三种情况

1.hash分表

-- 1.创建主表

drop table if exists dept;

create table dept (id  int primary key) partition by hash(id) ; 

--2.创建子表
create table dept_1 partition of dept FOR VALUES WITH (MODULUS 5, REMAINDER 0);
create table dept_2 partition of dept FOR VALUES WITH (MODULUS 5, REMAINDER 1);
create table dept_3 partition of dept FOR VALUES WITH (MODULUS 5, REMAINDER 2);
create table dept_4 partition of dept FOR VALUES WITH (MODULUS 5, REMAINDER 3);
create table dept_5 partition of dept FOR VALUES WITH (MODULUS 5, REMAINDER 4);

--3.插入数据
insert into dept (select generate_series(0,200000));

2.range分表

drop table if exists list_parted;
CREATE TABLE list_parted ( a int ) PARTITION BY range (a);

CREATE TABLE part_1 PARTITION OF list_parted FOR VALUES from (1) to (10);
CREATE TABLE part_2 PARTITION OF list_parted FOR VALUES from (10) to (20);
CREATE TABLE part_3 PARTITION OF list_parted FOR VALUES from (20) to (30);
CREATE TABLE part_4 PARTITION OF list_parted FOR VALUES from (30) to (40);
CREATE TABLE part_5 PARTITION OF list_parted FOR VALUES from (40) to (50);

3.list分表

方式2-list分表
drop table if exists list_parted;

CREATE TABLE list_parted ( a int ) PARTITION BY LIST (a);

CREATE TABLE part_1 PARTITION OF list_parted FOR VALUES IN (1);
CREATE TABLE part_2 PARTITION OF list_parted FOR VALUES IN (2);
CREATE TABLE part_3 PARTITION OF list_parted FOR VALUES IN (3);
CREATE TABLE part_4 PARTITION OF list_parted FOR VALUES IN (4);
CREATE TABLE part_5 PARTITION OF list_parted FOR VALUES IN (5);