1. While backing up to an SBT channel, you determine that the read phase of your compressed Recovery Manager (RMAN)incremental level 0 backup is a bottleneck FORCE I OGGING is enabled for the database Which two could improve read performance（）?
   A、Disable FORCE LOGGING for the database
   B、Enable asynchronous disk I/O
   C、Increase the size of the database buffer cache.
   D、Increase the level of RMAN multiplexing
   E、Increase the size of tape I/O buffers

improve read performance 可以开启异步IO或者多通道增加读的速度。

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