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The Republic of China (Traditional Chinese: 中華民國, Simplified Chinese: 中华民国; Wade-Giles: Chung-hua Min-kuo, Tongyong Pinyin: Jhong Huá Mín Guó, Hanyu Pinyin: Zhōnghuá Mínguó) is a state that currently administers the island groups of Taiwan, Penghu, Quemoy and Matsu.

Invalidating query cache mysql

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Keeping it optimized and used efficiently can make a big difference in the overall throughput of your application, so it's worth taking a look under the hood, understanding it, and then keeping it tuned optimally.A lot of database engines can cache queries, usually this allows them to avoid a hard parse of the query each time.My SQL Caching To make queries faster to respond is to use caching, a cache stores frequently used data in a place that is local where is can be accessed faster.Cached data can be stored either on a computers local hard disk or in the computers internal memory.I wish to discuss the memcached functions for My SQL: if and how they should be used.Disclaimer: I do not work with memcached functions for My SQL on a production system; all that is written here reflects my opinion on how things should be done. memcached is widely used, and has clients for many programming languages and platforms.Tangent Org have developed a memcached client in the form of My SQL UDFs (User Defined Functions).

If you have lots of small queries that return small result sets such as with web-based applications, it can be a real godsend to have the query cache working for you.I suspect the performance impact is even higher on My SQL 5.7. A single global mutex just doesn’t scale to 4 cores, let alone 24 cores at 8 threads per core.My SQL's query cache is an impressive piece of engineering if sometimes misunderstood.If you're unfamiliar with the query cache, here are some key points: This is not the only cache My SQL has.The storage engines often have lower level caches (e.g., Inno DB caches data and index pages in its cache configured with setting innodb_buffer_pool_size and My ISAM uses key_buffer_size for caching index pages)The cache will never serve stale data (unless you are running multiple mysqlds pointing to the same data directory - in that case do not use the query cache).So queries need to be invalidated when data changes.