• 1. 可重复读取: Repeatable read | No No No No
• 2. 不可重复读取: nonrepeatable read | Non-repeatable Reads
• 3. 非可重复读取: Non-repeatable read

• 1.在相同事务下对“可重复读取”区域内数据的多次请求的结果是相同的，但能够带来更好的应用吞吐量。
  With the "Repeatable Read" data region fetch requests issued multiple times within the same transaction will always produce the same result yielding better application throughput.
  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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