table cache mysql

The MySQL query mechanism is an important part of the MySQL database. The following describes the MySQL query cache mechanism in detail and hopes to help you. The cache mechanism simply caches the SQL text and query results. If the same SQL statement is run, the server direc

Supports more than 100 Adjustable settings, but fortunately, a few can meet most of the needs. To find the correct values of these settings, you can run the show status command to view the STATUS variables and determine whether the operation of mysqld meets our expectations. The memory allocated to the buffer and cache cannot exceed the existing memory in the system. Therefore, tuning usually requires some compromise.

comments if possible. In the MySQL extension of PHP, SQL comments are not removed. That is, three sqls will be stored in three different caches, although their results are the same. Select * from people where name = 'surfchen ';Select * from people where/* hey ~ */Name = 'surfchen ';Select * from people where name = 'surfchen ';Currently, only select statements are cached. Other statements similar to show and use statements are not cached. Because

, different data tables, different protocol versions, different character sets will be treated as different queries. SELECT * FROM Tbl_name select * from Tbl_name It is not appropriate to use the query cache in the following cases1) query is a subquery of an external query2) queries executed in a stored procedure, trigger, or functionIf the data table changes, such as adding/modif

Tags: qcacheFirst, the query cache descriptionMySQL query cache is used to cache the SELECT statement we execute and the result set of the statement, and MySQL is similar to typical KV storage in the specific technical details of implementing the query cache, is to make a ha

Mysql table sharding scenario analysis and simple table sharding operations Why table sharding? First of all, you must know the situations where table sharding requires you to use table sharding when the number of records in a si

Label:Https://help.aliyun.com/knowledge_detail/41717.html?spm=5176.7841698.2.11.aCvOXJ RDS for MySQL lookup cache (query cache) The settings and use of function and scope of application Principle Limit Set up Validation effect 1. Function and scope of applicationFunction: Reduce CPU usage Reduce IOPS utilization

Tags: database access line Redis server get frequent demand SSO RACIntroduction to using Redis as a cache for MySQL In the actual project, the MySQL database server is sometimes located in another host, need to access the database through the network, even if the application and the MySQL database in the same

statement; What statements are not cached When there are some indeterminate data in the query statement, it will not be cached, such as now (), current_time (), etc. If the query contains user-defined functions, stored functions, user variables, temporary tables, system tables in the MySQL library, or any tables that contain permissions, it is generally not cached caching brings additional overhead , because: The Read

Free up space for MySQL ibdata1 fileMysqldump options:--add-drop-table: Adds a statement that deletes a database table before each database table statement is created;--add-locks: Lock database tables when backing up database tables;--all-databases: Back up all databases on the MyS