sys Schema Views • total_read • avg_read • count_write • total_written • avg_written • thread • file • latency • operation • requested • host 5153 The  memory_by_host_by_current_bytes  and  x$memory_by_host_by_current_bytes  views have these columns: These views summarize memory use, grouped by host. By default, rows are sorted by descending amount of memory used. 28.4.3.16 The memory_by_host_by_current_bytes and x $memory_by_host_by_current_bytes Views 28.4.3.15 The latest_file_io and x$latest_file_io Views The number of bytes read for the I/O event. The average number of bytes per read for the I/O event. The number of write requests for the I/O event. The number of bytes written for the I/O event. The average number of bytes per write for the I/O event. These views summarize file I/O activity, grouped by file and thread. By default, rows are sorted with most recent I/O first. The  latest_file_io  and  x$latest_file_io  views have these columns: For foreground threads, the account associated with the thread (and port number for TCP/IP connections). For background threads, the thread name and thread ID The file path name. The wait time of the file I/O event. The type of operation. The number of data bytes requested for the file I/O event.