Created
March 4, 2017 08:45
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posrgresql partition by seq id
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| -- partition by month | |
| -- https://www.postgresql.org/docs/9.5/static/ddl-partitioning.html | |
| begin; | |
| drop trigger if exists insert_master_trigger on master; | |
| drop function if exists master_insert(); | |
| drop table if exists master cascade; | |
| create table master( | |
| id bigserial primary key, | |
| ts bigint not null, | |
| data text | |
| ); | |
| create or replace function master_insert() | |
| returns trigger as $$ | |
| declare | |
| partition_n bigint; | |
| begin_id bigint; | |
| end_id bigint; | |
| max_child_table_size bigint = 10240; | |
| table_master varchar := 'master'; | |
| table_child varchar; | |
| begin | |
| partition_n = 1 + (new.id-1) / max_child_table_size; | |
| table_child := table_master || '_' || partition_n; | |
| perform 1 from pg_class where relname = table_child limit 1; | |
| if not found | |
| then | |
| begin_id = 1 + (partition_n-1) * max_child_table_size; | |
| end_id = begin_id + max_child_table_size; | |
| execute format('create table %s (check (id>=%s and id < %s)) inherits (%s);', | |
| table_child, begin_id, end_id, table_master); | |
| execute format('create index %s_id_idx on %s (id);', table_child, table_child); | |
| end if; | |
| execute 'insert into ' || table_child || ' values ( ($1).* )' using new; | |
| return null; | |
| end; | |
| $$ | |
| language plpgsql; | |
| create trigger insert_master_trigger before insert on master for each row execute procedure master_insert(); | |
| commit; |
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