10.3.1 可重复读(RR-Repeatable Read) 可重复读隔离级别是最严格的隔离级别。在该隔离级别下，一个事务的影响完全与其他并发事务隔离，脏读、不可重复的读、幻像读现象...
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Supports table and row level locking and 4 isolation levels, RR (repeatable read), rs (read stability), CS (default - cursor stability) and ur (uncommitted read).
支持表级和行级锁以及4个隔离级别：RR(可重复读)、RS(读可靠)、CS(默认——游标可靠)和UR(未提交读)。
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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