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finders guide: adds some pointers to help users interpret the output …

…of EXPLAIN
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fxn committed Nov 25, 2011
1 parent 1be9830 commit b30b932447d3ae059c0dac2c5bf0a3a79e0fa54e
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  1. +11 −0 railties/guides/source/active_record_querying.textile
@@ -1344,3 +1344,14 @@ EXPLAIN for: SELECT `posts`.* FROM `posts` WHERE `posts`.`user_id` IN (1)
</plain>
under MySQL.
+
+h4. Interpreting EXPLAIN
+
+Interpretation of the output of EXPLAIN is beyond the scope of this guide. The
+following pointers may be helpful:
+
+* SQLite3: "EXPLAIN QUERY PLAN":http://www.sqlite.org/eqp.html
+
+* MySQL: "EXPLAIN Output Format":http://dev.mysql.com/doc/refman/5.6/en/explain-output.html
+
+* PostgreSQL: "Using EXPLAIN":http://www.postgresql.org/docs/current/static/using-explain.html

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