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Query Execution Techniques In PostgreSQL
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Category : Database » PostgreSQL
. Execution Techniques in PostgreSQL. Neil Conway <nconway@truviso. . Query Execution in PostgreSQL. October 20, 2007. 2 / 42. Division of Responsibilities .
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Content Summary :
Describe how Postgres works internally Shed some light on the black art of EXPLAIN reading Provide context to help you when tuning queries for performance. Describe how Postgres works internally Shed some light on the black art of EXPLAIN reading Provide context to help you when tuning queries for performance Outline 1 The big picture: the roles of the planner and executor 2 Plan trees and the Iterator model 3 Scan evaluation: table, index, and bitmap scans 4 Join evaluation: nested loops, sort-merge join, and hash join 5 Aggregate evaluation: grouping via sorting, grouping via hashing 6 Reading EXPLAIN
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