A TEXT column with a maximum length of 255 characters. VARBINARY Variable-length binary byte string. 2 VARCHAR Variable-length string. 1 SET Data Type Set, or string object that can have 0 or more values chosen
This means that internally TEXT uses less memory for each open table but instead has the additional overhead that each TEXT object needs to be allocated and freed for each row access (with some caching in between). See Also BLOB and TEXT Data Types MEDIUMTEXT Data Type Storage ...
MySQL存储引擎: 表类型: CREATE TABLE ... ENGINE= InnoDB: 处理大量的短期事务; 数据存储在“表空间”中; (1) 所有InnoDB表的数据和索引放置于同一个表空间中; 表空间文件:datadir定义的目录下 数据文件:ibdate1,ibdata2,... (2) 每个表单独使用一个表空间存储表的数据和索引; Innodb_file_per_table=...
18/g;s/ROW_FORMAT=COMPACT//g;s/bit/int/g;s/COLLATE.* utf8mb4_unicode_ci//g;s/DEFAULT CURRENT_TIMESTAMP//g;s/\<text\>/varchar(2000)/g;s/\<longtext\>/varchar(2000)/g;s/\<mediumtext\>/varchar(2000)/g;s/COLLATE utf8mb4_bin//g;s/ON UPDATE CURRENT_TIMESTAMP//g' /data/...
如遇到Columnstore从库的列类型不一致导致的复制异常问题(例如InnoDB里有text类型,Columnstore不支持,转换位varchar(8000/3) ->utf8),需要设置set global slave_type_conversions = ALL_LOSSY,ALL_NON_LOSSY; 即:所有允许的数据类型转换都会执行,而不管数据是否被截取。 四、InnoDB VS Columnstore 复杂SQL官方性能测试...
LONGTEXT:2^64 BLOB(Binary Large OBject):二进制格式,区分大小写 TINYBLOB 2^8个字符 SMALLBLOB 2^16个字符 MEDIUMBLOB 2^24个字符 BLOB 2^32个字符 LONGBLOB 2^64个字符 4)、内置类型 SET ENUM:枚举。即我定义好某字段填入的数据只能是哪几种。比如性别字段,只能选男或女。
字符串类型(string):包括CHAR,VARCHAR,BINARY,VARBINARY,BLOB,TEXT,ENUM,SET MariaDB 数据类型 回到顶部 ◆整数数据类型◆ 数值型类型主要用来存储数字,MySQL提供了多种数值数据类型,不同的数据类型提供不同的取值范围,可以存储的值范围越大,其所需要的存储空间也会越大,MySQL主要提供的整形有:TINYINT,SMALLINT,MEDIU...
Note that all text commands must be first on line and end with';' ? (\?) Synonym for `help'. # 查看帮助 clear (\c) Clear the current input statement. # 清空当前输入的语句 connect (\r) Reconnect to the server. Optional arguments are db and host. # 重新连接服务器 ...
如遇到Columnstore从库的列类型不一致导致的复制异常问题(例如InnoDB里有text类型,Columnstore不支持,转换位varchar(8000/3) ->utf8),需要设置set global slave_type_conversions = ALL_LOSSY,ALL_NON_LOSSY; 即:所有允许的数据类型转换都会执行,而不管数据是否被截取。
LONGTEXT Supported Supported VARBINARY Supported Supported BINARY Supported Supported TINYBLOB Supported Supported MEDIUMBLOB Supported Supported LONGBLOB Supported Supported ENUM Supported Supported SET Supported Supported BOOLEAN Supported Supported BIT Supported ...