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Temporary data files in Oracle are a special type of data file. Oracle uses temporary files to store the intermediate results of a large sort operation and hash operations, as well as to store global temporary table data, or result set data. If adequate space is not allocated or is not available to the temporary datafiles, it could cause abnormal termination of the key operations mentioned above, thereby rendering the database inaccessible.

The OraTempDataFileTest periodically monitors the space usage of the temporary datafiles, and proactively alerts administrators to excessive space consumption by, or deficiencies in space allocations to, the temp datafiles.

Measurement	Description	Measurement Unit	Interpretation
Allocated_size	This measure indicates the space allocated to temporaray datafiles.	MB
Used_size	This measure indicates the currently used space by temporary datafiles.	MB
Free_space	This measure indicates the free space available to temporary datafiles.	MB	Ideally, the value of this measurement should be very high.
Pct_free_space	This measure indicates the percentage of space allocated to the temp datafiles, which is still unused.	Percent	Typically, a high percentage of free space is desired. A value close to 0 or a consistent decrease in the value of this measure could indicate excessive space consumption by the temporary datafiles or insufficient space allocation; lack of free space for temporary datafiles can severely affect database performance, and can even cause the database to hang! To avoid such adversities, you might want to consider allocating more space to the temporary datafiles.