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How Postgres Chooses Which Index To Use For A Query
| | postgrespro.com
Queries in PostgreSQL: 4. Index scan : Postgres Professional
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| | In previous articles we discussed query execution stages and statistics . Last time, I started on data access methods, namely Sequential scan . Today we will cover Index Scan. This article requires a basic understanding of the index method interface. If words like "operator class" and "access method properties" don't ring a bell, check out my article on indexes from a while back for a refresher. Plain Index Scan Indexes return row version IDs (tuple IDs, or TIDs for short), which can be handled in one of...
| | www.crunchydata.com
Hacking the Postgres Statistics Tables for... | Crunchy Data Blog
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| | Adding extended statistics can add information about how columns are related. Louise has some real life example queries and tips for working with extended table stats that can dramatically improve query performance.
| | use-the-index-luke.com
Index INCLUDE Clause: How it works and when to use it
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| | The INCLUDE clause for CREATE INDEX is available in some SQL databases: Microsoft SQL Server, PostgreSQL, and IBM Db2 (LUW)
| | softwaredoug.com
What Is a Judgment List?
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| Judgment lists prevent search whack-a-mole. They provide a safety net for search, allowing you to innovate quickly on relevance with a high degree of confidence.