Re: Table Partitioning

On Tue, May 21, 2013 at 11:03 PM, Richard Onorato <richard_onorato(at)yahoo(dot)com
> wrote:

> I am wanting to partition my data based on a mod of one of the bigint
> columns, but when I run my insert test all the data goes into the base
> table and not the partitions. Here is what the table looks like:
>
> CREATE table MyMappingTable ( id bigserial NOT NULL,
> c1 bigInt NOT NULL,
> c2 bigInt NOT NULL,
> c3 bigint NOT NULL,
> count bigint DEFAULT 1,
> createdTime timestamp with time zone
> default CURRENT_TIMESTAMP,
> CONSTRAINT MyMappingTable_index
> PRIMARY KEY (id) )
> with (OIDS=FALSE);
>
> CREATE TABLE MyMappingTableT1 (PRIMARY KEY (id), CHECK((c1 % 5) = 0))
> INHERITS (MyMappingTable);
> CREATE TABLE MyMappingTableT2 (PRIMARY KEY (id), CHECK((c1 % 5) = 1))
> INHERITS (MyMappingTable);
> CREATE TABLE MyMappingTableT3 (PRIMARY KEY (id), CHECK((c1 % 5) = 2))
> INHERITS (MyMappingTable);
> CREATE TABLE MyMappingTableT4 (PRIMARY KEY (id), CHECK((c1 % 5) = 3))
> INHERITS (MyMappingTable);
> CREATE TABLE MyMappingTableT5 (PRIMARY KEY (id), CHECK((c1 % 5) = 4))
> INHERITS (MyMappingTable);
>
> Here is the trigger function that I added to the database:
>
> CREATE OR REPLACE FUNCTION my_mapping_table_insert_trigger()
> RETURNS trigger AS $$
> BEGIN
> IF ( (NEW.c1 % 5) = 0 ) THEN
> INSERT INTO MyMappingTableT1 VALUES (NEW.*);
> ELSIF ( (NEW.c1 % 5) = 1 ) THEN
> INSERT INTO MyMappingTableT2 VALUES (NEW.*);
> ELSIF ( (NEW.c1 % 5) = 2 ) THEN
> INSERT INTO MyMappingTableT3 VALUES (NEW.*);
> ELSIF ( (NEW.c1 % 5) = 3 ) THEN
> INSERT INTO MyMappingTableT4 VALUES (NEW.*);
> ELSIF ( (NEW.c1 % 5) = 4 ) THEN
> INSERT INTO MyMappingTableT5 VALUES (NEW.*);
> ELSE
> RAISE EXCEPTION 'c1 mod out of range. Something wrong with
> the my_mapping_table_insert_trigger() function!';
> END IF;
> RETURN NULL;
> END;
> $$
> LANGUAGE plpgsql;
>
> Here is the Trigger that I added to the table:
>
> CREATE TRIGGER insert_my_mapping_table_trigger
> BEFORE INSERT ON MyMappingTable
> FOR EACH ROW EXECUTE PROCEDURE my_mapping_table_insert_trigger();
>
> SET constraint_exclusion = ON;
>
> Regards,
>
> Richard
>

I tried your test case, its working fine from my end and populating data
properly to partition childs.

insert into mymappingtable values (1,7,20,30,1,now());
insert into mymappingtable values (2,6,20,30,1,now());
insert into mymappingtable values (3,8,20,30,1,now());
insert into mymappingtable values (4,9,20,30,1,now());
insert into mymappingtable values (5,10,20,30,1,now());

postgres=# \dt+ MyMappingTable*
List of relations
Schema | Name | Type | Owner | Size | Description
--------+------------------+-------+----------+------------+-------------
public | mymappingtable | table | postgres | 0 bytes |
public | mymappingtablet1 | table | postgres | 8192 bytes |
public | mymappingtablet2 | table | postgres | 8192 bytes |
public | mymappingtablet3 | table | postgres | 8192 bytes |
public | mymappingtablet4 | table | postgres | 8192 bytes |
public | mymappingtablet5 | table | postgres | 8192 bytes |

---
Regards,
Raghavendra
EnterpriseDB Corporation
Blog: http://raghavt.blogspot.com/