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已索引数据被直接读取到PGA内存中时，发生的等待。排序数据由于内存不足，被写到磁盘上（temp表空间数据...
已索引Similar to db file sequential read, except that t...
已索引The session waits while a sequential read from th...
已索引Reading from the control file. This happens in ma...
已索引The server is waiting on the client to send more ...