October 2010
Intermediate to advanced
468 pages
11h 35m
English
Content preview from PostgreSQL 9.0 High PerformanceBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Disk layout for PostgreSQL
Since PostgreSQL uses standard filesystems for all its files, there are several parts of the database you can relocate to somewhere else just by moving the associated files and adding a symbolic link to the new location.
Symbolic links
Symbolic links (also called a symlink) are just entries in a filesystem directory that point towards another location. UNIX systems originally preferred to use what are called hard links, which link to the new location quite directly. The entry in the filesystem literally points to another spot on disk. To make this easier to manage, the normal approach now is to use soft symlinks, which are easily visible. The most common thing to relocate using a symlink in PostgreSQL is the WAL transaction ...
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