April 2018
Intermediate to advanced
508 pages
15h 22m
English
Content preview from PostgreSQL 10 High Performance - Third Edition
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Queries and EXPLAIN
EXPLAIN plans can be output in XML, JSON, or YAML formats, to make it easier to analyze them with external tools (or to write such tools yourself). EXPLAIN (BUFFERS) allows monitoring of the actual I/O done by a particular query, instead of just showing its costs. EXPLAIN output shows more information about how the increasingly useful hash nodes in query plans.
Window functions have some new options, such as PRECEDING, FOLLOWING, and starting with CURRENT ROWS, all of which allow writing some new types of windowed queries. Outer joins that reference tables not actually used to satisfy the query can now be removed from the query plan to improve their performance. Queries with that issue are commonly created by object-relational ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.