Skip to Content
PostgreSQL 10 Administration Cookbook - Fourth Edition
book

PostgreSQL 10 Administration Cookbook - Fourth Edition

by Simon Riggs, Gianni Ciolli
May 2018
Intermediate to advanced content levelIntermediate to advanced
576 pages
30h 25m
English
Packt Publishing
Content preview from PostgreSQL 10 Administration Cookbook - Fourth Edition

How it works…

The connection limit is applied during the session connection. Raising this limit will never affect any connected users. Lowering the limit doesn't have any effect either, unless they try to disconnect and reconnect.

So, if you lower the limit, you should immediately check to see whether there are more sessions connected than the new limit you just set. Otherwise, there may be some surprises in case there is a crash:

postgres=> SELECT rolconnlimit             FROM pg_roles             WHERE rolname = 'fred'; rolconnlimit--------------            1(1 row)postgres=> SELECT count(*)             FROM pg_stat_activity             WHERE usename = 'fred'; count-------     2(1 row)

If you have more connected sessions than the new limit, you can ask users politely to disconnect, or apply the next ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

PostgreSQL 13 Cookbook

PostgreSQL 13 Cookbook

Vallarapu Naga Avinash Kumar
PostgreSQL 9 Administration Cookbook - Second Edition

PostgreSQL 9 Administration Cookbook - Second Edition

Simon Riggs, GIANNI CIOLLI, Hannu Krosing, Gabriele Bartolini

Publisher Resources

ISBN: 9781788474924Supplemental Content