February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third 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 log files 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, interrupt requests (IRQs), disk devices, networks, or even teletypewriters (TTYs).
When administering a highly available server, there are few things as helpful as performance trends. This recipe ...
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