Book Image

PostgreSQL 11 Administration Cookbook

By : Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala
Book Image

PostgreSQL 11 Administration Cookbook

By: Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala

Overview of this book

PostgreSQL is a powerful, open source database management system with an enviable reputation for high performance and stability. With many new features in its arsenal, PostgreSQL 11 allows you to scale up your PostgreSQL infrastructure. This book takes a step-by-step, recipe-based approach to effective PostgreSQL administration. The book will introduce you to new features such as logical replication, native table partitioning, additional query parallelism, and much more to help you to understand and control, crash recovery and plan backups. You will learn how to tackle a variety of problems and pain points for any database administrator such as creating tables, managing views, improving performance, and securing your database. As you make steady progress, the book will draw attention to important topics such as monitoring roles, backup, and recovery of your PostgreSQL 11 database to help you understand roles and produce a summary of log files, ensuring high availability, concurrency, and replication. By the end of this book, you will have the necessary knowledge to manage your PostgreSQL 11 database efficiently.
Table of Contents (19 chapters)
Title Page
Copyright and Credits
About Packt

Removing issues that cause bloat

Bloat can be caused by long-running queries or long-running write transactions that execute alongside write-heavy workloads. Resolving that is mostly down to understanding the workloads running on the server.

Getting ready

Look at the age of the oldest snapshots that are running, like this:

postgres=# SELECT now() -
  WHEN backend_xid IS NOT NULL
  THEN xact_start
  ELSE query_start END
  AS age
, pid
, backend_xid AS xid
, backend_xmin AS xmin
, state
FROM  pg_stat_activity
WHERE backend_type = 'client backend'
age             |  pid  |   xid    |   xmin   |        state       
00:00:25.791098 | 27624 |          | 10671262 | active
00:00:08.018103 | 27591 |          |          | idle in transaction
00:00:00.002444 | 27630 | 10703641 | 10703639 | active
00:00:00.001506 | 27631 | 10703642 | 10703640 | active
00:00:00.000324 | 27632 | 10703643 | 10703641 | active