This change sets the number of read-ahead blocks that are read for file systems mounted using NFS version 2 software.

这个修改为使用NFS version 2软件挂载的文件系统设置预读取块的数量。

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Usually media failure is caused by either the complete loss of a data file or a system change number (SCN) time stamp being out of sync with the rest of the database.

通常媒体故障是由于数据文件完全丢失或系统更改编号（System Change Number，SCN）时间戳与数据库的其余部分不同步造成的。

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If you wish to change the number of log file extents that are allocated for the queue manager you will need to change the values in the registry.

如果您希望更改为队列管理器分配的日志文件扩展的数量，您将需要在注册表中更改这些值。

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