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@@ -14,23 +14,34 @@ problematic (e.g. APC allows arbitrary data caching, while
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opcache).
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Caching the output of parsing your configuration files is
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-also expressly allowed (e.g. file caching). Some frameworks
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-use APCu to achieve this.
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+also expressly allowed (e.g. file caching, metadata caching).
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+Some frameworks use APCu or memcached to achieve this.
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Caching of the classloader (often referred to as optimizing
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the classloader) is also allowed. Most frameworks have their
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own methods of doing this.
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-Caching of any database, ORM results, or rendered templates
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-is not allowed.
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-
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-Caching any data using Redis is discouraged, as 1) our
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-Redis installation runs on a separate computer across the
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-network, so you won't see much benefit 2) your usage of
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-Redis *may* impact other framework's tests, which we cannot
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-allow. You may launch Redis on the application server as
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-part of your setup.sh scripts and utilize it for caching
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-if you so desire.
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+*Caching of any data fetched from the database is not allowed*.
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+Specifically, things such as [Doctrine's Result Cache](http://doctrine-orm.readthedocs.org/en/latest/reference/caching.html#result-cache) are inadmissible.
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+
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+However, if you are using an ORM that prepares SQL
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+statements in some way, such as how
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+[Doctrine](http://doctrine-orm.readthedocs.org/en/latest/reference/caching.html#query-cache)
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+translates DQL into SQL, this translated form can be
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+cached, as long as you are dynamically accepting
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+query parameters.
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+
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+Caching any data using databases (Redis, MongoDB, etc)
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+is discouraged, as 1) our databases run on a separate
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+computer across the network, so you won't see much
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+benefit 2) your usage of the DB *may* impact other
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+framework's tests, which we cannot allow. You may launch
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+a DB locally on the application server as part of your
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+`setup.sh` scripts and utilize it for caching the allowable
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+cache items, if you so desire, but it's normally much
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+easier to use systems such as APCu.
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+
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+Ask if you are not certain.
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# Adding New PHP-based Frameworks
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Hamilton Turner