mysql query cache size

. This 2011-year record will not affect the 2010 partition table. At this point, if the user repeatedly query the shipment information for 2010, as long as they use the same SQL statement (no different query criteria), then you can enjoy the benefits of caching mechanism, improve the application system query effect.Three, the impact of multiple applications on th

received select statement in string mode based on the preset hash algorithm, then, go to the Query Cache to check whether the data has been cached. That is to say, if the select request is already in the cache, the data will be directly returned, thus omitting all subsequent steps (such as SQL statement parsing, optimizer optimization and Data Request to the sto

internal temporary disk table is the MyISAM table and this value is used. You can use the Check status value ' Created_tmp_disk_tables ' to learn more. INNODB_BUFFER_POOL_SIZE:INNODB uses this parameter to specify the size of the memory to buffer the data and index, which is the most performance-impacting parameter in the InnoDB engine. Innodb_additional_mem_pool_size: Specifies the size of the memory

algorithm and then go directly to the query cache to find out if it is already cached. That is, if it is already in the cache, the select request returns the data directly, omitting all subsequent steps (such as parsing of SQL statements, optimizer optimizations, and requesting data to the storage engine), which greatly improves performance. Of course,

, you can say that your cache is useless at all, which is equivalent to disabling it. In this case, does the system allocate the size set by query_cache_size? is this problem to be tested? If it is set to 1, all results will be cached unless your select statement uses SQL _NO_CACHE to disable the query cache. If set to

index size. The value of key_buffer_size does not need to be set to be greater than the index.Or no more than 25%-50% of the total memory reserved by the operating system cacheWhen setting, see index field size: select sum (index_length) from information_schema. 'tables'By default, mysql changes all indexes to the default key

say whether the cache is more expensive than the QC system. But one thing is certain, the role of the QC cache is very small, if the application layer can implement the cache, will be able to ignore the results of the QC. ————-below are some of the other details about QC ————— – First, Query

have explicitly stated that you need to use Query Cache), MySQL will directly HASH the received select statement in string mode based on the preset hash algorithm, then, go to the Query Cache to check whether the data has been cached. That is to say, if the select request i

Analysis on the principle and cache process of using Memcache to cache mysql databases For large websites such as facebook and ebay, if Memcache is not used as the intermediate cache layer, data access cannot be avoided. for general websites, as long as they have independent servers, you can configure Memcache to spe

flush the cache, and dirty reads will occur if you do not perform a flush cache.Setting the Flushcache= "true" property in the statement configuration, which is true by default, refreshes the cache and does not refresh if it is changed to false. When you use caching, dirty reads occur if you manually modify the query data in a database table.Summary: In general,

level two cache.usecache= "false">3.6 Refreshing the cache (that is, emptying the cache)In the same namespace of mapper, if you have additional insert, UPDATE, delete operation data, you need to flush the cache, and dirty reads will occur if you do not perform a flush cache.Setting the Flushcache= "true" property in the statement configuration, which is true by

What is hard disk caching? We might as well start to understand this concept, in fact, the so-called hard disk caching is used to store and store temporary data space, in general, the larger the cache, then the more temporary files can be stored, then for the computer, the running fluency is higher, for the hard disk, Also can be relative to reduce the hard drive seek and mechanical wear, no doubt, for hard disk is also a good way of maintenance. So i

Mybatis BASICS (8) ----- query cache, mybatis -----1. What is query cache? Mybatis provides query cache to reduce data pressure and improve database performance. Mybaits provides Level 1 cache