April 2018
Intermediate to advanced
508 pages
15h 22m
English
Content preview from PostgreSQL 10 High Performance - Third Edition
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constraint_exclusion
If you are using partitioned tables that use constraints, enabling constraint_exclusion allows the planner to ignore partitions that can't have the data being searched for when that can be proven. This parameter originally defaulted to off, meaning that, unless toggled on partitioned tables, it will not work as expected. Starting in PostgreSQL 8.4, this was improved such that a new default value, partition, will do the right thing here in most cases without adding the overhead to the ones it isn't necessary for. It is theoretically possible to see a tiny performance improvement by turning this feature off in newer versions where it defaults to partition, in cases where there are no partitions on your system.
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