| Measurement |
Description |
Measurement
Unit |
Interpretation |
| Cache_lookups |
Number of lookups to the buffer cache during
the last measurement period
|
Number
|
 
|
| Cache_hits |
Number of hits from the buffer cache during the
last measurement period
|
Number
|
 
|
| Cache_hit_ratio |
The ratio of cache hits to total lookups during
the last measurement period.
|
Percent
|
A value close to 90% is good.
|
| Buffers_locked |
Number of buffers locked during the last
measurement period
|
Number
|
 
|
| New_buffer_requests |
Number of new buffer requests issued during
the last measurement period
|
Number
|
 
|
| Waits_for_buffer_allocs |
Number of buffer allocation requests during
the last measurement period that had to wait
|
Number
|
This value should be close to
0 for optimal operation.
|