当前位置：网站首页>Advanced learning of MySQL -- Application -- storage engine

Advanced learning of MySQL -- Application -- storage engine

2022-07-04 01:59:00 【Magic pig 9898】

mysql Architecture of

Insert picture description here

Work of all levels

adjoining course

Mainly completes some similar to the connection processing , Authorized certification , And related safety programs , The server will also verify the operation authority of each client for secure access .

Service layer

The second layer mainly completes some core services , And complete the cache query , SQL Analysis and optimization of , Execution of some built-in functions , All the cross storage engine functions are also implemented in this layer . Like the process , Functions, etc .

Engine layer

The storage engine is really responsible for MySQL Storage and reading of data in , Server pass API Communicating with the storage engine , Different storage engines have different functions , In this way, according to our own needs , To choose the right storage engine .

Storage layer

It mainly stores the data on the file system , And complete the interaction with the storage engine

Introduction to storage engine

The storage engine is to store data , Index , to update / Implementation of query data and other technologies , The storage engine is table based , Not library based , So the storage engine is also called table type . ( To put it bluntly , In a database , The engine of each table may be different )

Query key table statement

Found that the default engine is InnoDB.

Query the storage engine supported by the current database

show engines ;
Insert picture description here

Specify the engine when creating the table

Storage engine features

InnoDB

Insert picture description here

InnoDB Logical storage structure

Insert picture description here
therefore
The table space corresponds to ibd file .

The obvious , Row is the smallest unit of storage , And what information does a line contain ?
Last transaction id, Some pointers , There are also field information .

stay InnoDB In the logic of
Page is the smallest unit of disk operation , And the size is fixed 16K, The size of the zone is fixed . yes 1M. It means that there are 64 page .