Where is the query itself? And, what storage engine? myisam or innodb? Even with the query cache disabled, the index and/or the data could have already been cached in the memory in other buffers.Navigate: Pre
- 在查询中显式添加`SQL_NO_CACHE`修饰符(如`SELECT SQL_NO_CACHE ...`),MySQL会跳过缓存,直接执行并返回结果,且结果不会被存入查询缓存。 - 该方法仅适用于需要针对特定查询禁用缓存的场景,不影响全局缓存设置。 2. **其他相关配置**: - 若需完全禁用查询缓存,可通过服务器配置(如设置`query_cache_...
MySQL does not handle cached data in one big chunk; instead it is handled in blocks. The minimum amount of memory allocated to each block is determined by thequery_cache_min_res_unitvariable. The default value is 4096 bytes or 4KB. query_cache_sizecontrols the total amount of memory allo...
Let’s say, you want to analyze the stages of a query that is spending most of the time in, you need to enable the respective logging using the below query. 1 2 3 4 5 MySQL> update performance_schema.setup_consumers set ENABLED='YES' where NAME='events_stages_current'; Query OK, ...
If the content is found in the cache, then it is being served immediately to the client (avoiding PHP processing, MySQL queries, etc.). This is called a cache HIT. On the other hand, if the content is not found in the cache, the web server has to fetch it from the origin server ...
When you’re finished, test whether you’re able to log in to the MySQL console by typing: sudomysql Copy This will connect to the MySQL server as the administrative database userroot, which is inferred by the use ofsudowhen running this command. Below is an example output: ...
Themyisam_use_mmapsystem variable can be set to 1 to enable memory-mapping for allMyISAMtables. If an internal in-memory temporary table becomes too large (as determined bytmp_table_sizeandmax_heap_table_size), MySQL automatically converts the table from in-memory to on-disk format, which...
query_cache_size: This setting controls the size of the query cache, which stores previously executed queries for faster re-execution. Increasing this value can improve performance for repetitive queries, but it also consumes more memory and might not be effective for dynamic queries. thread_pool_...
MySQL closes an unused table and removes it from the table cache under the following circumstances: When the cache is full and a thread tries to open a table that is not in the cache. When the cache contains more thantable_open_cacheentries and a table in the cache is no longer being ...
The SQL_NO_CACHE disable the qeury from the query cache, it will still use the key_buffer that caches the MyISAM indexes. Subject Views Written By Posted How to disable query caching? 4922 Diane Weaver March 06, 2006 04:33PM Re: How to disable query caching?