Checksums, made available in Postgres 9.3, are incredibly valuable to ensure your database doesn’t silently corrupt. But, as with most things they’re not free. Take a look at what performance impact turning them on may have.
Files are hard was a great article that lays out so many of the issues on files and filesystems. As a response to that he laid out many of the choices in the popular extension cstore from Citus Data, a great read if you want to look at the internals of one approach to an interesting extension.
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