The two most common and popular MySQL database engines areMyISAMandInnoDB. MyISAM is the default engine for MySQL for versions earlier than 5.5.5, and functions well in most scenarios. However, depending on your needs, there are situations where another database engine, such as InnoDB, may ...
13.9 Using Data Types from Other Database Engines To facilitate the use of code written for SQL implementations from other vendors, MySQL maps data types as shown in the following table. These mappings make it easier to import table definitions from other database systems into MySQL. ...
mysql>CREATETABLEt(aBOOL,bFLOAT8,cLONGVARCHAR,dNUMERIC);Query OK, 0 rows affected (0.00 sec)mysql>DESCRIBEt;+---+---+---+---+---+---+|Field|Type|Null|Key|Default|Extra|+---+---+---+---+---+---+|a|tinyint(1)|YES||NULL|||b|double|YES||NULL|||c|mediumtext|YES||...
1 row in set (0,00 sec) Database in ClickHouse, exchanging data with the MySQL server: CREATEDATABASEmysql_dbENGINE=MySQL('localhost:3306','test','my_user','user_password')SETTINGS read_write_timeout=10000,connect_timeout=100; SHOWDATABASES ...
By default, ClickHouse uses its own database engine, which provides configurabletable enginesand all the supportedSQL syntax. You can also use the MySQL engine. Lazy Engine It stores a table in memory since the lastexpiration_time_in_seconds(for\*Logengine tables only). Due to the long inter...
4 rows in set (0.00 sec) 2)删除现有表的某个INDEX索引字段 比如,删除tea4表中名称为named的INDEX索引字段: mysql> drop INDEX name ON tea4;//删除name字段的索引 Query OK, 0 rows affected (0.18 sec) Records: 0 Duplicates: 0 Warnings: 0 ...
Storage engine of a database refers to the type of tables and determines how tables are stored in computers. Although MySQL supports different types of storage engines, not all of them have been optimized for data restoration and persistence. TencentDB for MySQL features such as point-in-time ...
* *是否使用MySQL的“删除”,它允许黑客的数量 * 受影响的行显示。 preg_replace函数使用一个启用时, * 添加更多一点的处理所有的查询。 */ var $delete_hack = TRUE;/** * The syntax to count rows is slightly different across different * database engines, so this string appears in each driver ...
Its OK to mix the storage engines but you must keep in mind that MyISAM does not provide all the features that Innodb does (from a user's perspective) and there are cases when one is better than other. Your backup strategy will also be a bit complicated while using mixed storage engines...
In order to move your backup storage from locally redundant storage to geo-redundant storage, dump and restore is the ONLY option. Migrating from alternative storage engines to InnoDB - Azure Database for MySQL Flexible Server supports only InnoDB Storage engine, and therefore doesn't support ...