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PostgreSQL 10 High Performance - Third Edition
book

PostgreSQL 10 High Performance - Third Edition

by Enrico Pirozzi
April 2018
Intermediate to advanced content levelIntermediate to advanced
508 pages
15h 22m
English
Packt Publishing
Content preview from PostgreSQL 10 High Performance - Third Edition

Connections and activity

pg_stat_activity provides a way to get a snapshot of what every client on the server is currently doing. Because it includes a process ID, on UNIX-like systems pg_stat_activity is also useful to line up with information collected at the OS level by utilities such as top or ps.

The simplest thing to do with this view is to count how many client backends are currently active:

    pgbench=# SELECT count(*) FROM pg_stat_activity WHERE NOT procpid=pg_backend_pid();
     count 
    -------
         4
  

As the query itself will normally appear in the results, that's filtered out by looking up its process ID and excluding it. This is a good practice to get into queries against this view. This total gives you an idea how close you are to reaching ...

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Publisher Resources

ISBN: 9781788474481Supplemental Content