How MySQL modifies the storage engine to InnoDB

mysql How to modify the storage engine to innodb

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Two ways to modify ：1、 Use SET Statement to temporarily modify the default storage engine , The grammar is “SET default_storage_engine=innodb;”, When the client is restarted, it will revert to the original engine type .2、 Use ALTER TABLE Statement modification , grammar “ALTER TABLE Table name ENGINE=innodb;”, You can change the engine type of the specified table to innodb.

The operating environment of this tutorial ：windows7 System 、mysql8 edition 、Dell G3 The computer .

mysql Modify the storage engine to innodb Two methods of

1、 Use SET Statement temporary modification

Use the following statement to modify the default storage engine of the temporary database ：

SET default_storage_engine=<  Storage engine name  >

Example ： Modify the default storage engine to innodb

SET default_storage_engine=innodb;

here , You can find MySQL The default storage engine for has become InnoDB. But when the client is restarted, it will revert to the original engine type .

notes ： stay MySQL 5.5 Before , When you create a table without explicitly specifying the storage engine ,MyISAM Is the default storage engine . From version 5.5 Start ,MySQL Use InnoDB As the default storage engine .

2、 Use ALTER TABLE Statement modification

MySQL The syntax format of the storage engine that modifies the data table in is as follows ：

ALTER TABLE < Table name > ENGINE=< Storage engine name >;

• ENGINE Keyword is used to indicate the new storage engine .

Examples demonstrate

Data table contacts The storage engine of is changed to InnoDB.

Before modifying the storage engine , First use SHOW CREATE TABLE Statement view contacts Table current storage engine

SHOW CREATE TABLE contacts \G

You can see ,contacts The current storage engine of the table is MyISAM.

Next contacts The storage engine of the table is modified to InnoDB   type ,SQL Statement for ：

ALTER TABLE contacts ENGINE=InnoDB;

Use SHOW CREATE TABLE Statement view again contacts Table storage engine , Will find contacts The storage engine for tables becomes “InnoDB”

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