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PostgreSQL 10 Administration Cookbook - Fourth Edition
book

PostgreSQL 10 Administration Cookbook - Fourth Edition

by Simon Riggs, Gianni Ciolli
May 2018
Intermediate to advanced content levelIntermediate to advanced
576 pages
30h 25m
English
Packt Publishing
Content preview from PostgreSQL 10 Administration Cookbook - Fourth Edition

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A very important pg_stat_statements feature is the normalization of queries that can be planned (SELECT, INSERT, DELETE, and UPDATE). You might have indeed noticed some ? characters in the query field returned by the queries outlined in the previous section. The normalization process intercepts constants in SQL statements run by users and replaces them with a placeholder (identified by a question mark).

Consider the following queries:

SELECT * FROM bands WHERE name = 'AC/DC';SELECT * FROM bands WHERE name = 'Lynyrd Skynyrd';

After the normalization process, these two queries appear as one in pg_stat_statements:

gabriele=# SELECT query, calls FROM pg_stat_statements;                 query                 | calls---------------------------------------+------- ...
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Publisher Resources

ISBN: 9781788474924Supplemental Content