Dell Vizioncore Manual de usuario Pagina 373

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Working with Data 373
Managing Retention Policies
•“About Retention Policy Mechanisms” on page 373
•“Accessing the Manage Retention Policies Dashboard” on page 378
•“Deleting Retention Policies” on page 381
•“Viewing the Hierarchy of Topology Types in the Database Schema” on page 383
•“Editing Retention Policies” on page 386
•“Creating Retention Policies” on page 388
About Retention Policy Mechanisms
While it is theoretically possible to create any retention policy that you desire in
vFoglight, the design of the system constrains the easy-to-accomplish retention policies
to a narrow range of options. Specifically, the database design of vFoglight provides a
structure that is capable of holding data in three different buckets, called generations,
that are defined in <vfoglight_home>/config/storage-config.xml. Each generation has a
predefined period of time in which it retains data. Without modification to the
generations, there are specific rules that must be followed when assigning retention
policies to ensure that you get the results you are expecting.
This section provides information on the key mechanisms involved in retention policies
and rules for defining retention policies that work effectively with the default database
configuration.
For complete information, see the following sections:
•“About database generations” on page 373
•“How vFoglight populates database generations” on page 374
•“How retention policies interact with database generations” on page 375
•“Developing a retention policy: Example” on page 376
About database generations
Generations refer to the database structures that hold long-term data. For any given
metric, each generation can hold one aggregation level of data (for example, raw, hourly
averages, 4 hour averages, and so on). Out of the box, there are three generations, each
holding data for:
Generation 1: Data for 0 – 3 days
Generation 2: Data for 3 – 14 days
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