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boringsql.com | ||
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jazco.dev
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| | | | | Postgres uses an internal table called 'pg_statistic' to keep track of some metadata on all tables in the DB. Postgres's Planner uses these statistics when estimating the cost of operations, which, if out of date, can cause the Planner to pick a suboptimal plan for our query. To trigger an update of 'pg_statistic' manually for a table, we can run 'ANALYZE' on it, helping the Planner estimate costs better and speeding up queries dramatically (in some cases). | |
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www.crunchydata.com
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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. | |
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postgrespro.com
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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... | |
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oracle-randolf.blogspot.com
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| | | Why attend this workshop? The Oracle database offers various tools that can be used to measure performance - in this hands on workshop you w... | ||
