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, or are `timestamp(precision)` effectively the same for storage as `timestamp`? (based on docs, I assume the latter but wanted to 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)

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