1. Components of Mysql
Mysql consists of SQL interface, parser, optimizer, cache, and storage engine.
2. Mysql working principle diagram
##3. Description of each component of Mysql schematic diagram
4. SQL statement execution process
The database is usually not used directly, but other programming languages call mysql through SQL statements, which is processed by mysql and returned for execution. result. So how does Mysql process the SQL statement after it receives it? First, the request of the program will interact with it through the connectors of mysql. After the request is received, it will be temporarily stored in the connection pool (connection pool) and processed by the processor (Management Serveices & Utilities) manage. When the request enters the processing queue from the waiting queue, the manager will throw the request to the SQL interface (
SQL Interface). After the SQL interface receives the request, it will hash the request and compare it with the results in the cache. If there is a complete match, the processing result will be returned directly through the cache; otherwise, a complete process will be required:
5. Note
In fact, this is not the case. After the first query, mysql will hash the query statement and query results and keep them in the cache. After the SQL query arrives, it will be hashed in the same way. The two hash values are compared. If they are the same, it is a hit and the query result is returned from the cache; otherwise, the entire process needs to be repeated.
I hope this article can provide some help to students who are learning databases. If there is something wrong in the article, please point it out. Thank you very much!
For more Mysql related questions, please visit the PHP Chinese website: mysql video tutorial
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