Sql Postgresql Hash Index - Latest Information & Updates 2026

Web Reference: Feb 26, 2026 · PostgreSQL includes an implementation of persistent on-disk hash indexes, which are fully crash recoverable. Any data type can be indexed by a hash index, including data types that do not have a well-defined linear ordering. A Hash index is approximately 30% the size of a B-Tree index for something like a URL. The reduced size allows PostgreSQL to use it's cache memory (Aka, shared_buffers) more efficiently. Indexes in PostgreSQL are database objects that improve the speed of data retrieval operations on a database table. Hash indexes are used to quickly locate rows in a table based on equality comparisons. Hash indexes are particularly useful when queries involve equality conditions, such as `=`.

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Last Updated: April 4, 2026

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