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For optimum performance make sure you use asynchronous I/Os.
TRUE is the default parameter value for the majority of platforms.
gerardnico@orcl>SHOW PARAMETER disk_asynch_io
NAME TYPE VALUE
------------------------------------ ----------- ------
disk_asynch_io boolean TRUE
select * from v$parameter where lower(name) = 'disk_asynch_io' ;
These parameters enable or disable the operating system's asynchronous I/O facility. They allow query server processes to overlap I/O requests with processing when performing table scans.
Asynchronous operations are currently supported for parallel table scans, hash joins, sorts, and serial table scans. However, this feature can require operating system specific configuration and may not be supported on all platforms.