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This article introduces the knowledge of "what are the components of mysql server?". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. Connection management, which is a management tool for establishing connection between client and server of MySQL database.

The client connects to the MySQL database through IP address, port number, user name, password and other information, and then verifies the connection through the database connection management tool to confirm the permissions of the user name and password, whether you can access the database, and which databases you can access.

2. Cache query.

In order to optimize the efficiency of accessing data, MySQL puts some data from SQL queries into the cache. When SQL queries the database with other SELECT statements, it first checks to see if the corresponding data is in the cache. If so, return directly and analyze the SQL. However, because the cache hit needs to meet many conditions, such as the same SQL, the same context and so on, the cache hit rate of MySQL is very low, so in the MySQL8.0 version, the cache query has been removed.

3. Parser.

The function of the MySQL parser is to analyze SQL statements and analyze the syntax and semantics of SQL statements.

4. Optimizer to optimize the execution efficiency of SQL.

MySQL's optimizer can analyze which way SQL executes most efficiently. For example, whether the query sentence is a full scan or an indexed query, the optimizer of MySQL is the key component that determines the performance of SQL execution. But the optimizer is not omnipotent, because the optimizer determines which mode of execution to use, using sampling statistical analysis based on database data. Sampling statistical analysis can sometimes lead to data bias, causing the optimizer to use the wrong execution method.

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