February 2017
Intermediate to advanced
536 pages
28h 47m
English
Content preview from PostgreSQL High Availability Cookbook - Second Edition
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Viewing past performance with sar
While there are many tools to view or analyze the current server performance and behavior, how do we examine historical activity? Most Linux systems rotate logfiles in /var/log for varying periods of time. Unfortunately, these are programs and system logs, not performance measurements.
When we installed the sysstat package in a previous recipe, we gained the use of the sar utility. Some argue that sar is the Swiss Army knife of metric collection. A simple invocation can display past data regarding memory, CPUs, IRQs, disk devices, networks, or even TTYs.
When administering a highly-available server, there are few things as helpful as performance trends. Let's examine them.
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