Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: "Many experienced PostgreSQL DBAs will prefer to execute their own VACUUM commands."

A block of code is set as follows:

autovacuum = on track_counts = on 

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

$ ln -sf autovacuum.conf.night autovacuum.conf $ pg_ctl reload

Any command-line input or output is written as follows:

VACUUM (DISABLE_PAGE_SKIPPING);

Tips or important notes

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