postgresql实现对已有数据表分区处理的操作详解

create table public.t_test_back as (select * from public.t_test);

CREATE TABLE public.t_test (
    id bigserial NOT NULL,
    column1 int8 NOT NULL,
    column2 varchar NOT NULL,
    column3 varchar NULL,
    create_time timestamptz NULL,
    CONSTRAINT t_test_pkey PRIMARY KEY (id)
);

CREATE INDEX column1_idx ON public.t_test USING btree (column1);
CREATE INDEX column2_idx ON public.t_test USING btree (column2);

drop table public.t_test;

-- 找到当前表还在执行的查询
select pid, query, state from pg_stat_activity where state = 'state' and query like '%t_test%';
-- 可以取消查询
select pg_cancel_backend(pid);
-- 也可以强制中止会话
select pg_terminate_backend(pid);

CREATE TABLE public.t_test (
    id bigserial NOT NULL,
    column1 int8 NOT NULL,
    column2 varchar NOT NULL,
    column3 varchar NULL,
    create_time timestamptz NOT null DEFAULT CURRENT_TIMESTAMP,
    CONSTRAINT t_test_pkey PRIMARY KEY (id, create_time)
) partition by range(create_time);

create table public.t_test_2022_02 partition of public.t_test for values from ('2022-06-01 00:00:00') to ('2022-12-31 23:59:59');

create table public.t_test_2023_01 partition of public.t_test for values from ('2023-01-01 00:00:00') to ('2023-06-30 23:59:59');
create table public.t_test_2023_02 partition of public.t_test for values from ('2023-07-01 00:00:00') to ('2023-12-31 23:59:59');

create table public.t_test_2024_01 partition of public.t_test for values from ('2024-01-01 00:00:00') to ('2024-06-30 23:59:59');
create table public.t_test_2024_02 partition of public.t_test for values from ('2024-07-01 00:00:00') to ('2024-12-31 23:59:59');

create table public.t_test_default partition of public.t_test DEFAULT;

CREATE INDEX column1_idx ON public.t_test USING btree (column1);
CREATE INDEX column2_idx ON public.t_test USING btree (column2);

alter sequence public.t_test_id_seq restart 340000000;

insert into public.t_test (select * from public.t_test_back);