> On Jul 15, 2024, at 12:06, Sarkar, Subhadeep <subhadeepsar...@kpmg.com> wrote:
>
> • Does the Community edition of PostgreSQL provide NATIVE active-active
> high availability clustering with objectives of scalability, load balancing
> and high availability without using any extensions or external components or
> usage of Kubernetes/Dockers.
>
> • In the Community edition of PostgreSQL is it possible to setup a database
> cluster in load balancing mode and provide vertical and horizontal
> scalability without repartitioning or changes to the database objects or 3rd
> party transaction routing mechanisms using NATIVE features only (i.e. without
> using any extensions or external components or usage of Kubernetes/Dockers).
>
> • In the Community edition of PostgreSQL is it possible to setup a cluster
> where all the nodes are able to concurrently read-write the underlying
> database image using NATIVE features (i.e. without using any extensions or
> external components or usage of Kubernetes/Dockers).
Short answer: No.
The community version of PostgreSQL, without any extensions beyond what is
available in the core distribution, supports none of these. I will offer that
your client is not being realistic if these are their requirements, and they
expect them to be fulfilled by the core distribution of any open-source
database.
There are commercial extensions to PostgreSQL that provide the first, but
PostgreSQL does not do so out of the box. It is possible, now, to build this
on top of community PostgreSQL with logical replication, but there is notable
development work involved, and you cannot just drop an existing database into
PostgreSQL and expect this to work. In any event, you will need to make sure
the schema is compatible with an active-active model.
For the second, you can explore open-source projects such as Citus, but some
attention to the schema and queries will be required.
No product, either commercial or open-source, provides the last one (read-write
shared storage), although there are commercial products that provide for a
shared-storage model single-writer, multiple-reader model (for example, Amazon
Aurora).
