Cosimo Streppone wrote:

Merlin Moncure wrote:

> If everything is working the way it's supposed to, 8.0 should be faster
> than 7.1 (like, twice faster) for what you are probably trying to do.

In the next days I will be testing the entire application with the
same database only changing the backend from 7.1 to 8.0, so this is
a somewhat perfect condition to have a "real-world" benchmark
of Pg 8.0 vs 7.1.x performances.

The "next days" have come. I did a complete migration to Pg 8.0.1 from 7.1.3. It was a *huge* jump. The application is exactly the same, also the database structure is the same. I only dumped the entire 7.1.3 db, changed the backend version, and restored the data in the 8.0.1 db.

The performance level of Pg 8 is at least *five* times higher
(faster!) than 7.1.3 in "query-intensive" transactions,
which is absolutely astounding.

In my experience, Pg8 handles far better non-unique indexes
with low cardinality built on numeric and integer types, which
is very common in our application.


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