On Sun, Jul 17, 2016 at 3:23 AM, Craig Ringer <cr...@2ndquadrant.com> wrote:

> Lots more could be shared, too. Cached plans, for example.

But the fact that PostgreSQL has transactional DDL complicates things like
a shared plan cache and shared PL/pgSQL execution trees. Those things are
much easier in a trivial database implementation, where an ALTER TABLE is
just trampling over a running transaction.

Regards, Jan

Jan Wieck
Senior Postgres Architect

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