Re: does timestamp precision affect storage size?

On 21/06/16 22:39, Jonathan Vanasco wrote:
> i'm cleaning up some queries for performance, and noticed that we never use precision beyond the second (ie,
`timestamp(0)`)in our business logic. 
>
> would there be any savings in storage or performance improvements from losing the resolution on fractional seconds,
orare `timestamp(precision)` effectively the same for storage as `timestamp`?  (based on docs, I assume the latter but
wantedto check) 

No, there are no space savings here.

=# select pg_column_size('now'::timestamptz(0)),
pg_column_size('now'::timestamptz);

 pg_column_size | pg_column_size
----------------+----------------
              8 |              8
(1 row)

--
Vik Fearing                                          +33 6 46 75 15 36
http://2ndQuadrant.fr     PostgreSQL : Expertise, Formation et Support