PostgreSQL 12 High Availability Cookbook - Third Edition

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Our examples of iostat always include the -d argument, to only show disk information. By default, it shows both CPU and disk measurements. The CPU data looks like this:

avg-cpu:  %user   %nice %system %iowait  %steal   %idle 
           9.38    0.00   16.67   11.46    0.00   62.50 

This can be useful for analysis as well, though there are several other tools that also provide this data. If we use the -c parameter instead of -d, we will see only the CPU statistics, and no information about disk devices will be included in the output.