May 2017
Beginner
416 pages
10h 37m
English
Content preview from Mastering PostgreSQL 9.6
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SP-GiST indexes
Space partitioned GiST (SP-GiST) has mainly been designed for in-memory use. The reason for that is that an SP-GiST stored on disk needs a fairly high number of disk hits to function. Disk hits are way more expensive than just following a couple of pointers in RAM.
The beauty is that SP-GiST can be used to implement various types of trees such as quad-trees, k-d trees, and radix trees (tries).
The following strategies are provided:
|
Operation |
Strategy number |
|
Strictly left of |
1 |
|
Strictly right of |
5 |
|
Same |
6 |
|
Contained by |
8 |
|
Strictly below |
10 |
|
Strictly above |
11 |
To write your own operator classes for SP-GiST, a couple of functions have to be provided:
|
Function |
Description |
Support ... |
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