[server] implement dynamic database pooler
Opening too much database connection has a cost at startup and also PostgreSQL
as a maximum number of connection (100 by default).
This get worse when starting multiple wsgi processes, since each process has
its own database pool.
Instead of opening `connections-pool-size` connections to the database at
startup, just open one and open more only when needed.
Cubes
=====
This chapter describes how to define your own cubes and reuse already available cubes.
.. toctree::
:maxdepth: 1
layout.rst
cc-newcube.rst
available-cubes.rst