February 2017
Intermediate to advanced
536 pages
28h 47m
English
Content preview from PostgreSQL High Availability Cookbook - Second Edition
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Correlating performance with dstat
Eventually, we will want to view multiple types of system activity simultaneously. While sar has many operating modes, its output is linear. Without a tool to interpret its exhaustive data, we are left with a lot of manual analysis of several sar invocations. While iostat and iotop are wonderful tools, they are rather limited in scope by comparison.
So, let us introduce dstat. While dstat can't access historical data like sar, it can display output from several different operation modes side by side. It also includes color coding to easily distinguish units. It's a very pretty command-line tool and it summarizes several different metrics at a glance.
For servers that are of particular importance, we actually ...
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