postgresql - integer out of range

问题:

Not the slightest idea why the hell this is happening..

I've set up a table accordingly:

CREATE TABLE raw (
    id          SERIAL,
    regtime     float NOT NULL,
    time        float NOT NULL,
    source      varchar(15),
    sourceport  INTEGER,
    destination varchar(15),
    destport    INTEGER,
    blocked     boolean
); ... + index and grants

I've successfully used this table for a while now, and all of a sudden the following insert doesn't work any longer..

INSERT INTO raw(
    time, regtime, blocked, destport, sourceport, source, destination
) VALUES (
    1403184512.2283964, 1403184662.118, False, 2, 3, '192.168.0.1', '192.168.0.2'
);

The error is: ERROR: integer out of range

I mean comon... Not even sure where to begin debugging this.. I'm not out of disk-space and the error itself is kinda discreet..

回答1:

SERIAL columns are stored as INTEGERs, giving them a maximum value of 2³¹-1. So after ~2 billion inserts, your new id values will no longer fit.

If you expect this many inserts over the life of your table, create it with a BIGSERIAL (internally a BIGINT, with a maximum of 2⁶³-1).

If you discover later on that a SERIAL isn't big enough, you can increase the size of an existing field with:

ALTER TABLE raw ALTER COLUMN id TYPE BIGINT;

Note that it's BIGINT here, rather than BIGSERIAL (as serials aren't real types). And keep in mind that, if you actually have 2 billion records in your table, this might take a little while...