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The mysqlnd query result cache plugin adds easy to use client-side query caching to all PHP MySQL extensions using mysqlnd.
As of version PHP 5.3.3 the MySQL native driver for PHP ( mysqlnd) features an internal plugin C API. C plugins, such as the query cache plugin, can extend the functionality of mysqlnd.
Mysqlnd plugins such as the query cache plugin operate transparent from a user perspective. The cache plugin supports all PHP applications and all PHP MySQL extensions ( mysqli, mysql, PDO_MYSQL). It does not change existing APIs.
No significant application changes are required to cache a query. The cache has two operation modes. It will either cache all queries (not recommended) or only those queries marked with a certain SQL hint (recommended).
Transparent and therefore easy to use
supports all PHP MySQL extensions
no API changes
very little application changes required
Flexible invalidation strategy
Time-to-Live (TTL)
user-defined
Storage with different scope and life-span
Default (Hash, process memory)
MEMCACHE
sqlite
user-defined
Built-in slam defense to prevent cache stampeding.
The current 1.0.1 release of PECL mysqlnd_qc does not support PHP 5.4. Version 1.1.0-alpha lifts this limitation.
Prepared statements and unbuffered queries are fully supported. Thus, the plugin is capable of caching all statements issued with mysqli or PDO_MySQL, which are the only two PHP MySQL APIs to offer prepared statement support.
The shortcut mysqlnd_qc stands for mysqlnd query cache plugin. The name was chosen for a quick-and-dirty proof-of-concept. In the beginning the developers did not expect to continue using the code base. Sometimes PECL/mysqlnd_qc has also been called client-side query result set cache.