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.klaver@aklaver.com