MySQL storage engine

Storage engine

• InnoDB Storage engine

  Support transactions , It introduces row lock design and supports foreign keys

  Put the data in a logical table space , from MySQL4.1 Start ,InnoDB Storage 1 The forms of the engine are stored in a total of independent ibd In file , The default is the repeatable read isolation level

• MyISAM Storage engine

  Neither transactions nor foreign keys are supported , Full text index support ,MyISAM The cache pool knows the cache index file , Instead of caching data files

  MyISAM The storage engine table consists of MYD and MYI form

  MYD Used to store data files ,MYI Used to store index files

• Memory Storage engine

  Store all the data in the table in memory , If the database restarts or crashes , All the data in the table will disappear

  A temporary table suitable for storing temporary data , By default, hash index is used .

• NDB Storage engine

  NDB The storage engine is a cluster storage engine .

  characteristic ： All the data is in memory （ from MySQL5.1 Start , You can put non index data on disk ）, The speed of primary key search is extremely fast by adding NDB The data storage node can improve the database performance linearly , It is a cluster system with high availability and high performance

  problem ：NDB The connection operation is performed on the MySQL The database layer completes , It's not done in the storage engine layer , Complex connection operations require huge network overhead , So the query speed is very slow .

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  （ Reference from 《MySQL Technology insider InnoDB Storage engine 》）