Re: Sequence generating negative numbers

On 8/19/20 3:15 PM, Shantanu Shekhar wrote:
> Team,
>
> I have a sequence definition in Postgres 9.6.11 like so:
>
> CREATE SEQUENCE IF NOT EXISTS org.my_seq
>   INCREMENT 1
>   MINVALUE 1
>   NO MAXVALUE
>   START 1
>   CACHE 20;
>
> This sequence is used by a Java ORM framework to generate primary keys
> for one of our tables. The initial numbers generated by this sequence
> are as shown below:
>
> -28 -27 -26 -25 -8 -7 1 2 52 53 72 92 93 94 112 113 132 133 152 172 192
> 193 212
>
> I am unable to understand why the sequence would start with a negative
> number, particularly when the definition explicitly asks the sequence to
> start at 1. This has happened consistently in all of our environments.

Because something in the ORM is generating negative numbers and
supplying then directly to the PK field.

>
> Thanks,
>
> Shantanu

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com