The plug-in storage engine is one of the most important features of the MySQL database. Users can find out how to store and index data and whether to use it according to the needs of the application. Affairs etc. MySQL supports multiple storage engines by default to suit database application needs in different fields. Users can choose different storage engines to improve application efficiency and provide flexible storage.
View the engines supported by the current database
show engines +--------------------+---------+------------------------------+--------------+------+------------+ | Engine | Support | Comment | Transactions | XA | Savepoints | +--------------------+---------+---------------------+--------------+------+------------+ | InnoDB | DEFAULT | Supports transactions, row-level locking, and foreign keys | YES | YES | YES | | MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO | | MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO | | BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO | | MyISAM | YES | MyISAM storage engine | NO | NO | NO | | CSV | YES | CSV storage engine | NO | NO | NO | | ARCHIVE | YES | Archive storage engine | NO | NO | NO | | PERFORMANCE_SCHEMA | YES | Performance Schema | NO | NO | NO | | FEDERATED | NO | Federated MySQL storage engine | NULL | NULL | NULL | +--------------------+---------+--------------+--------------+------+------------+ 9 rows in set (0.00 sec)
or
show engines \G
mysql> show engines \G
*************************** 1. row ***************************
Engine: InnoDB
Support: DEFAULT
Comment: Supports transactions, row-level locking, and foreign keys
Transactions: YES
XA: YES
Savepoints: YES
*************************** 2. row ***************************
Engine: MRG_MYISAM
Support: YES
Comment: Collection of identical MyISAM tables
Transactions: NO
XA: NO
Savepoints: NO
*************************** 3. row ***************************
Engine: MEMORY
Support: YES
Comment: Hash based, stored in memory, useful for temporary tables
Transactions: NO
XA: NO
Savepoints: NO
*************************** 4. row ***************************
Engine: BLACKHOLE
Support: YES
Comment: /dev/null storage engine (anything you write to it disappears)
Transactions: NO
XA: NO
Savepoints: NO
*************************** 5. row ***************************
Engine: MyISAM
Support: YES
Comment: MyISAM storage engine
Transactions: NO
XA: NO
Savepoints: NO
*************************** 6. row ***************************
Engine: CSV
Support: YES
Comment: CSV storage engine
Transactions: NO
XA: NO
Savepoints: NO
*************************** 7. row ***************************
Engine: ARCHIVE
Support: YES
Comment: Archive storage engine
Transactions: NO
XA: NO
Savepoints: NO
*************************** 8. row ***************************
Engine: PERFORMANCE_SCHEMA
Support: YES
Comment: Performance Schema
Transactions: NO
XA: NO
Savepoints: NO
*************************** 9. row ***************************
Engine: FEDERATED
Support: NO
Comment: Federated MySQL storage engine
Transactions: NULL
XA: NULL
Savepoints: NULL
9 rows in set (0.00 sec)Engine name of the engine
Support Whether to pay YES means support, NO means not supported
Comment Comment or comment Defalut means the engine is supported by default
Transactions Whether Support transactions, YES means supported, NO means not supported
XA Whether all supported distributions comply with XA specifications, YES means supported, NO means not supported
Savepoints Whether to support save points in transaction processing, YES means supported, NO means not supported
or
show variables like 'have%'
mysql> show variables like 'have%'; +------------------------+----------+ | Variable_name | Value | +------------------------+----------+ | have_compress | YES | | have_crypt | NO | | have_dynamic_loading | YES | | have_geometry | YES | | have_openssl | DISABLED | | have_profiling | YES | | have_query_cache | YES | | have_rtree_keys | YES | | have_ssl | DISABLED | | have_statement_timeout | YES | | have_symlink | YES | +------------------------+----------+ 11 rows in set, 1 warning (0.00 sec)
Variable_name engine name
value Whether it is supported YES, NO is not supported, DISABLED means it is supported but not enabled
View the default engine
show variables like '%storage_engine%'
mysql> show variables like '%storage_engine%'; +----------------------------------+--------+ | Variable_name | Value | +----------------------------------+--------+ | default_storage_engine | InnoDB | | default_tmp_storage_engine | InnoDB | | disabled_storage_engines | | | internal_tmp_disk_storage_engine | InnoDB | +----------------------------------+--------+ 4 rows in set, 1 warning (0.00 sec)
InnoDB is the default engine
Modify the default engine
my.ini file
[mysqld] # The next three options are mutually exclusive to SERVER_PORT below. # skip-networking # enable-named-pipe # shared-memory # shared-memory-base-name=MYSQL # The Pipe the MySQL Server will use # socket=MYSQL # The TCP/IP Port the MySQL Server will listen on 默认端口号 port=3306 # Path to installation directory. All paths are usually resolved relative to this. 服务器的默认安装目录 # basedir="C:/Program Files/MySQL/MySQL Server 5.7/" # Path to the database root 数据库数据文件的目录 datadir=C:/ProgramData/MySQL/MySQL Server 5.7\Data # The default character set that will be used when a new schema or table is # created and no character set is defined 修改服务器默认字符 character-set-server=utf8 # The default storage engine that will be used when create new tables when # 这里修改默认引擎 default-storage-engine=INNODB
Restart the Mysql service after modification
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