实际上，在INSERT期间惟一保持的行级锁是next - key锁，这个锁用于使INSERT不会添加键到可重复的读扫描器。

In fact, the only row-level locking that remains during INSERT is the next-key locks that are required to protect an INSERT from adding keys to repeatable read scanners.

youdao

比如，读取只读的查找表不需要可重复读级别，未提交读级别就足够了。

For example, reading from a read - only look up table doesn t require repeatable read, and uncommitted read is sufficient.

youdao