January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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Index categories
We can classify indexes for several categories; not that these categories can be mixed up, which enables us to model very complex logic. For example, we could have a unique partial index, to make sure that only part of the data was unique, based on a certain condition. The index categories are as follows:
- Partial indexes: A partial index only indexes a subset of the table data that meets a certain predicate; the WHERE clause is used with the index. The idea behind a partial index is to decrease the index size, making it more maintainable and faster to access.
- Covering indexes: These were introduced in PostgreSQL 11. They allow some queries to be executed only using an index-only scan. Currently, this is only supported by ...
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