• 1. 可重复的读: Repeatable Read
• 2. 不可重复的读: Non-Repeatable Read | Unrepeatable Read

• 1.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.
  dict.yoduao.com
• 2.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.
  dict.yoduao.com

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