未授权读取 也称为读未提交(Read Uncommitted):允许脏读取,但不允许更新丢失。如果一个事务已经开始写数据,则另外一个数据则不允许同时进行写操作,但允许其他事务读此行数...
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Read committed, Read uncommitted, Repeatable Read, Serializable.
提交读,未提交读,可重复读,可串行读。
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)。
The initialization of the split mirror as snapshot performs a crash recovery, rolls back all uncommitted transactions, and makes the database available for any read or write operation.
将分割镜像初始化为快照时,将执行崩溃恢复,回滚所有未提交的事务,并使数据库可以被所有读或写操作访问。
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