May 2017
Beginner
416 pages
10h 37m
English
Content preview from Mastering PostgreSQL 9.6
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Making use of snapshot too old
VACUUM is doing a good job and it will reclaim free space as needed. But when can VACUUM actually clean out rows and turn them into free space? The rule is this: if a row cannot be seen by anybody anymore, it can be reclaimed. In reality this means that everything that is no longer seen even by the oldest transaction can be considered to be really dead.
This also implies that really long transactions can postpone cleanup for quite some time. The logical consequence is table bloat. Tables will grow beyond proportion and performance will tend to go downhill.
Fortunately PostgreSQL 9.6 has a nice feature that allows the administrator to intelligently limit the duration of a transaction. Oracle administrators will ...
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