MySQL InnoDB data length limit per row

In use today MySQL innodb when ,create table when , Report such an error :

Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. You have to change some columns to TEXT or BLOBs
Look up MySQL The official data of , Each record has a maximum length of .MySQL Official documents of ：

link ：https://dev.mysql.com/doc/refman/8.0/en/column-count-limit.html#row-size-limits

  stay MySQL innodb in , All the data is page by page (page) To operate the , One page 16KB( default ), use B+ Tree as index ,B+ Every node in the tree is 16KB, Store data in each leaf node at the bottom , Take the primary key index as an example , If each leaf node is 16KB, Then one row of data exceeds 16KB when , There will be row overflow , Overflow data is put into another page in , namely uncompresse blob page

But in B+ In the tree , Every leaf node page At least 2 Row data , Otherwise it will lose its meaning . Then the length of a row of data is less than 8KB, The length of data in a row exceeds 8KB when ,innodb The rest of the data will be written out to another overflow page , Before the column 768 Bytes are stored in this page , At the same time, there is an offset pointing to the overflow page .

The official solution ：

1. Split vertical table fields or merge large fields ( The maximum number of large fields is 768, Business merger ＋ Split )

2. Modify the storage engine of the table ,modify InnoDB to MyISAM.

3. modify row_format by COMPRESSED perhaps DYNAMIC, Of course, the premise is to guarantee innodb_file_format =Barracuda.