| Measurement |
Description |
Measurement
Unit |
Interpretation |
| Num_of_writes |
Indicates the rate of writes to this datafile. |
Write/Sec |
|
| Num_of_bytes_written |
Indicates the rate at which data was written to this datafile. |
Kb/Sec |
|
| Io_stall_write |
Indicates the total time taken to write to this datafile. |
Milliseconds/write |
A high value for this measure could indicate a bottleneck while writing to the datafile. By comparing the value of this measure across datafiles, you can identify the datafile to which write operations are taking too long to complete. |
| Num_of_reads |
Indicates the rate of reads from this datafile. |
Read/Sec |
|
| Num_of_bytes_read |
Indicates the rate at which data was read from this datafile. |
Kb/Sec |
|
| Io_stall_read |
Indicates the total time taken to read from this datafile. |
Milliseconds/read |
A high value for this measure could indicate a bottleneck while reading from the datafile. By comparing the value of this measure across datafiles, you can identify the datafile to which read operations are taking too long to complete. |
| Io_stall |
Indicates the total time taken for I/O operations to complete on this datafile. |
Milliseconds/IO |
A high value for this measure could indicate an I/O bottleneck on this datafile. |
| Size_on_disk |
Indicates the total size on disk of this datafile. |
MB |
This measure is used to determine the growth of the datafile. A low value is desired for this measure. A very high value, or a consistent increase in this value may adversely impact I/O operations. You may want to consider maintaining multiple datafiles of smaller sizes to improve I/O efficiency, and to speed up backup/restore operations. |