Dell Vizioncore Manual de usuario Pagina 375

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Working with Data 375
Managing Retention Policies
How retention policies interact with database generations
Both mechanisms for populating the repository (from memory to the database, database
roll-ups) use the retention policies defined in the Retention Policies Dashboard as the
guidelines for how they store data.
A retention policy is the set of definitions, for a given object, that indicate how data is
stored. Each definition within a policy contains two parameters:
Age: Specifies the age at which the data is eligible for a roll-up
Roll-up period: Specifies the period of time over which the data is aggregated
Policies can be set at an object level; however, retention policies also adhere to the
object inheritance capabilities. If a policy has not been explicitly assigned to an object,
it inherits a value from a higher level in the model. The top-level object is
TopologyObject.
The policy that is applied to
TopologyObject, and therefore any object which does
not have explicitly assigned policies, is as follows:
The illustration below shows the interaction between the
TopologyObject retention
policy and the default generation definitions.
Policy Translates to
Age
15 minutes After 15 minutes, store 15 minute average data to
Generation 1 (where they are stored for three days)
Roll-up
15 minutes
Age
4 hours Data older than four hours is eligible for roll-up (they are
actually only rolled up once a day during the database roll-
up) to one-hour averages and persisted into Generation 2
(where they are stored for 14 days)
Roll-up
1 hour
Age
5 days Data older than 5 days old is eligible for Roll-up (they are
actually only rolled up once per day during the database
roll-up) to four-hour averages and persisted into
Generation 3 indefinitely
Roll-up
4 hours
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