Web要找到特定索引列key_col的MIN()或MAX()值。这是由一个预处理器优化的,它检查你是否在索引中key_col之前出现的所有关键部分上使用WHERE key_part_N = constant。在这种情况下,MySQL对每个MIN()或MAX()表达式进行一次键查找,并将其替换为常数。 WebJan 4, 2024 · [Err] 1071 - Specified key was too long; max key length is 767 bytes。 这个就是因为联合所以长度限制的。 我们来看看MySql InnoDB引擎对索引长度的限制: mysql单索引限制: 在默认情况下,InnoDB对单一的字段索引长度限制最大为767个字节。 这个长度怎 …
【Rails】【MySQL】Mysql2::Error: Specified key was too long
WebUse MySQL profiling: You can use MySQL profiling tools like pt-query-digest or mysqldumpslow to identify slow queries and optimize them. Use a transaction isolation level: If your application allows it, you can use a lower transaction isolation level (such as READ COMMITTED ) to reduce the amount of time that locks are held. Web要找到特定索引列key_col的MIN()或MAX()值。这是由一个预处理器优化的,它检查你是否在索引中key_col之前出现的所有关键部分上使用WHERE key_part_N = constant。在这种情 … dog\u0027s wife
MySQL添加索引Specified key was too long; max key …
Web最近在创建三个字段联合唯一索引。发现提示 “Specified key was too long; max key length is 1000 bytes” 问题原因. MySQL 在建立索引时,数据库会先计算Index用到的字段长度(按下 … WebNov 7, 2024 · mysql索引过长Specialed key was too long问题记录. 在创建要给表的时候遇到一个有意思的问题,提示 Specified key was too long; max key length is 767 bytes ,从 … WebERROR 1071 (42000): Specified key was too long; max key length is 3072 bytes That's sloppy code but the bottom line is that my answer doesn't actually fix this problem. I don't see a way to use ROW_FORMAT=COMPRESSED by default, nor does it seem like a good idea if it were possible, and I'm inclined to suggest that the answer is... dog\u0027s wife dead