| 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. |
Millisecs |
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.
|
MilliSec |
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.
|
MilliSec |
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.
|
Bytes |
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.
|