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This test indicates the level of activity on a specific datafile in terms of the rate of physical reads and physical writes. The measures made by this test are as follows:

Measurement	Description	Measurement Unit	Interpretation
Physical_block_read_rate	Indicates the rate at which disk blocks are being read from a specific datafile.	Blocks/Sec	A scenario in which more than 50% of blocks are being read from a single datafile could signify a problem.
Physical_block_write_rate	Indicates the rate at which disk blocks are being written to a specific datafile.	Blocks/Sec	A scenario in which more than 50% of blocks are being written to a single datafile could signify a problem. Too much activity to a specific datafile can result in reduced database performance. To improve performance, consider balancing I/O across disks, and reorganize tables across tablespaces to reduce activity to a specific datafile.
Pct_total_IO	Indicates the percentage of total I/O operations on the database server that were handled by a data file.	Percent	Disk reads and writes are expensive operations and all I/Os should be balanced across the different data files of an Oracle database for optimal performance. This metric reports the percentage of all I/O of an Oracle database that are happening on each of the data files of the Oracle database. This metric allows an Oracle administrator to determine which is/are the hot data file(s) (e.g., which data file is handling 80% of the total I/O).