Book Image

PostgreSQL 10 High Performance - Third Edition

By : Enrico Pirozzi
Book Image

PostgreSQL 10 High Performance - Third Edition

By: Enrico Pirozzi

Overview of this book

PostgreSQL database servers have a common set of problems that they encounter as their usage gets heavier and requirements get more demanding. Peek into the future of your PostgreSQL 10 database's problems today. Know the warning signs to look for and how to avoid the most common issues before they even happen. Surprisingly, most PostgreSQL database applications evolve in the same way—choose the right hardware, tune the operating system and server memory use, optimize queries against the database and CPUs with the right indexes, and monitor every layer, from hardware to queries, using tools from inside and outside PostgreSQL. Also, using monitoring insight, PostgreSQL database applications continuously rework the design and configuration. On reaching the limits of a single server, they break things up; connection pooling, caching, partitioning, replication, and parallel queries can all help handle increasing database workloads. By the end of this book, you will have all the knowledge you need to design, run, and manage your PostgreSQL solution while ensuring high performance and high availability
Table of Contents (18 chapters)

Cumulative and live views

There are two types of information you can monitor from the database. The main statistics are stored into counters. These counters start at 0 when you create a new database cluster, increasing with all activity related to that statistic. Counters in this category include pg_stat_database, pg_stat_bgwriter, and all of the other views whose names start with pg_stat.

The exact way that you reset these counters back to 0 again varies quite a bit based on your PostgreSQL version:

  • 8.1: pg_stat_reset() resets all statistics. Enabling
    stats_reset_on_server_start in the postgresql.conf file will reset everything each time the server is started.
  • 8.2: pg_stat_reset() resets just block and row level statistics. Enabling stats_reset_on_server_start allows resetting all statistics, including the database and cluster wide ones, each time the server is started.
  • 8.3...