April 2018
Intermediate to advanced
508 pages
15h 22m
English
Content preview from PostgreSQL 10 High Performance - Third Edition
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Returning free disk space
Usually, administrators are surprised to find that there is no reduction in disk space from using vacuum. There is only one situation where VACUUM can actually reduce the size of a table. If the last data page of a table is empty, completely free of rows, and it's possible to obtain an exclusive lock on the table, VACUUM executes a special disk release process. It will scan backwards from the end, returning all pages it finds to the operating system as now free space, until it finds a data page that isn't empty.
Accordingly, it's only possible for a regular vacuum to reduce the size of a table if it has a contiguous chunk of free space at the end of the table. One common situation that can produce this pattern of ...
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