| OID | 1.3.6.1.2.1.90.1.2.1.1.6 |
| Module | DISMAN-EXPRESSION-MIB (CISCO) |
| Nom | expExpressionDeltaInterval |
| Acces | readwrite |
| Status | current |
| Description | Sampling interval for objects in this expression with
expObjectSampleType 'deltaValue'.
This object has no effect if the the expression has no
deltaValue objects.
A value of 0 indicates no automated sampling. In this case
the delta is the difference from the last time the expression
was evaluated. Note that this is subject to unpredictable
delta times in the face of retries or multiple managers.
A value greater than zero is the number of seconds between
automated samples.
Until the delta interval has expired once the delta for the
object is effectively not instantiated and evaluating
the expression has results as if the object itself were not
instantiated.
Note that delta values potentially consume large amounts of
system CPU and memory. Delta state and processing must
continue constantly even if the expression is not being used.
That is, the expression is being evaluated every delta interval,
even if no application is reading those values. For wildcarded
objects this can be substantial overhead.
Note that delta intervals, external expression value sampling
intervals and delta intervals for expressions within other
expressions can have unusual interactions as they are impossible
to synchronize accurately. In general one interval embedded
below another must be enough shorter that the higher sample
sees relatively smooth, predictable behavior. So, for example,
to avoid the higher level getting the same sample twice, the
lower level should sample at least twice as fast as the higher
level does. |
| Unite | seconds |
| Syntaxe | Integer32 (0...86400) |
| Module | DISMAN-EXPRESSION-MIB (ietf) |
| Nom | expExpressionDeltaInterval |
| Acces | readwrite |
| Status | current |
| Description | Sampling interval for objects in this expression with
expObjectSampleType 'deltaValue'.
This object has no effect if the the expression has no
deltaValue objects.
A value of 0 indicates no automated sampling. In this case
the delta is the difference from the last time the expression
was evaluated. Note that this is subject to unpredictable
delta times in the face of retries or multiple managers.
A value greater than zero is the number of seconds between
automated samples.
Until the delta interval has expired once the delta for the
object is effectively not instantiated and evaluating
the expression has results as if the object itself were not
instantiated.
Note that delta values potentially consume large amounts of
system CPU and memory. Delta state and processing must
continue constantly even if the expression is not being used.
That is, the expression is being evaluated every delta interval,
even if no application is reading those values. For wildcarded
objects this can be substantial overhead.
Note that delta intervals, external expression value sampling
intervals and delta intervals for expressions within other
expressions can have unusual interactions as they are impossible
to synchronize accurately. In general one interval embedded
below another must be enough shorter that the higher sample
sees relatively smooth, predictable behavior. So, for example,
to avoid the higher level getting the same sample twice, the
lower level should sample at least twice as fast as the higher
level does. |
| Unite | seconds |
| Syntaxe | Integer32 (0...86400) |