May 2019
Intermediate to advanced
600 pages
20h 46m
English
book
PostgreSQL 11 Administration Cookbook
by Simon Riggs, Gianni Ciolli, Sudheer Kumar Meesala, Sheldon Strauch
Content preview from PostgreSQL 11 Administration Cookbook
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Not enough CPU power or disk I/O capacity for the current load
These issues are usually caused by suboptimal query plans, but sometimes, your computer is just not powerful enough.
In this case, top is your friend. For quick checks, run the following from the command line:
user@host:~$ top
First, watch the percentage of idle CPU from top. If this is in low single digits most of the time, you probably have problems with the CPU's power.
If you have a high load average with a lot of CPU idle left, you are probably out of disk bandwidth. In this case, you should also have lots of Postgres processes in the D status, meaning that the process is in an uninterruptible state (usually waiting for I/O).
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