我的桌子:
create table test( pk bigint primary key,
value1 varchar(255),
value2 varchar(255),
value3 varchar(255),
value4 varchar(255),
value5 varchar(255),
value6 varchar(255),
value7 varchar(255),
value8 varchar(255),
value9 varchar(255),
value10 varchar(255),
value11 varchar(255),
);
插入查询:
insert into test values(1, '‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱','‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱','‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱','‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱','‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱','‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱','‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱','‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱','‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱','‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱','‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱‱');
我的页面大小是16KB
。因此,表格中的一行最多可以包含8192bytes
(即8KB
)。
我创建了11个VARCHAR
列(每个255个字符),其中这11个列最多可以容纳255*11 = 2805
个字符。
如果我存储了2805 - 3byte
个字符,则将花费(255*11*3
= 8415bytes
,超过了最大行大小(8192bytes
)的限制。
现在,我尝试插入上述具有8415bytes
数据的单行查询。但是我的MYSQL
并没有引发接受插入查询的错误。
3 byte character - ‱
Row Format - DYNAMIC
Collation - UTF8mb3
Character set - utf8_general_ci
Mysql - 5.7
更新:CHAR列也发生了同样的事情(将VarChar更改为Char),这是固定长度的列。
答案 0 :(得分:4)
您误解了innodb行大小限制说明。引用mysql manual(强调是我的意思):
最大行长,可变长度列除外(VARBINARY, VARCHAR ,BLOB和TEXT),小于4KB,8KB的一页的一半,16KB和32KB页面大小。例如,默认innodb_page_size为16KB的最大行长度约为8000个字节。 ...
如果一行的长度少于一页的一半,则所有行都将存储在本地页面内。 如果超过一页的一半,则将选择可变长度的列用于外部页外存储,直到该行适合半页之内为止,如第14.12.2节“文件空间管理”中所述。 / p>
由于您的字段是varchar(可变长度的怪异类型),所以超出半页大小限制的数据仅存储在其他页外位置,因此您的sql语句正确。
修改
对于char
字段,其行为取决于行格式和所使用的字符集。
char
字段的长度根据字符数是固定的,但是根据字符集,字节长度可以是固定的(例如latin1固定为1个字节/字符),也可以是可变的(例如utf8mb3)是可变长度1-3个字节/字符)。
对于compact
行格式,字符集无关紧要,如果要创建表,则最大可能的字节长度超过了从页面大小配置派生的数据页面限制,则会收到一条错误消息。
对于dynamic
行格式,如果字符集为固定长度,并且字节长度超过了数据页限制,则在创建表时会出现错误。但是,如果字符集是可变长度的,则数据将存储在溢出页面中。
答案 1 :(得分:1)
正如SHADOW在VARHCAR
列中所说的
如果一行的长度少于一页的一半,则所有行都将存储在本地页面内。如果超过一页的一半,那么将选择可变长度的列用于外部页外存储,直到该行适合半页之内
对于CHAR
列
InnoDB将长度大于或等于768字节的固定长度字段编码为可变长度字段,可以将其存储在页面外。例如,如果字符集的最大字节长度大于3(与utf8mb4相同),则CHAR(255)列可以超过768个字节。 https://forums.mysql.com/read.php?24,645115,645215#msg-645215
其中mysql内部将固定长度字段转换为可变长度字段 https://dev.mysql.com/doc/refman/5.6/en/storage-requirements.html
答案 2 :(得分:1)
在内部,对于可变长度字符集(例如utf8mb3和utf8mb4), InnoDB尝试通过修剪尾随空格来以N个字节存储CHAR(N)。如果CHAR(N)列值的字节长度超过N个字节,则尾随空格将被修剪为该列值字节长度的最小值。 CHAR(N)列的最大长度是最大字符字节长度×N。
为CHAR(N)保留最少N个字节。在许多情况下,保留最小空间N可使列更新就地完成,而不会导致索引页碎片。相比之下,使用REDUNDANT行格式时,CHAR(N)列占据最大字符字节长度×N。
以上是指ROW_FORMAT
= COMPACT,DYNAMIC和COMPRESSED(压缩前)。这是关于 CHAR 的页上存储。