...用MVCC（多版本并发控制）来支持高并发，实现了四个ANSI标准的隔离级别，默认为Repeatable Read，并且通过间隙锁(next-key lock)防止幻读。2）InnoDB的表是基于聚簇索引，对主键查询有很高的性能，但它的二级索引必须包含主键列。
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The first step in budgeting is to review the key business metrics and lock them down based on what is realistic for the next year. Be very realistic.
预算的第一步是回顾关键的商务体系并锁定他们，以上工作应基于来年的现实预测，要非常现实。
These next key locks are only obtained when the key INSERT finds that a scanner with a Repeatable Read (RR) isolation level has a row lock on the next-higher key in the index.
这些next key锁只有在key INSERT发现带有Repeatable Read (RR)隔离级别的扫描器在索引中的next - higher键上有一个行锁时才能获得。
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