RR不允许幻象读取，它会在选择行时创建一个S（share）表锁定。
RR does not allow phantom reads by creating an S (share) table lock when selecting rows.
SQL 2005有一个 基于快照的隔离级别 ，它能在不允许“脏读”的情况下避免数据读取阻塞数据写入，或者数据写入阻塞数据读取。
SQL 2005 has snapshot-based isolation levels that prevent readers from blocking writers or writers from blocking readers without allowing dirty reads.
这是不允许的，因为代码不能从只写标识符中读取值。
This is not allowed because code cannot read values from write-only identifiers.
可能授权某个内部管理工具读取某个职员的人事文件的某些部分，但不允许该工具修改这些部分。
An internal management tool could be authorized to read certain sections of an employee's personnel file but not to modify those sections.
可能授权某个内部管理工具读取某个职员的人事文件的某些部分，但不允许该工具修改这些部分。
An internal management tool could be authorized to read certain sections of an employee's personnel file but not to modify those sections.
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