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Working with Data 377

Managing Retention Policies

Level 2

> 15 minutes

and < 3 days

Any roll-up

greater than

Level 1

The age date for the Level 2 policy

must be less than or equal to three

days. Data is persisted at the roll-

up interval defined in the Level 2

policy for 14 days.

Level 3

> Level 2

setting and <

14 days

Any roll-up

greater than

Level 2

The age date for the Level 3 policy

must be less than or equal to 14

days. Data is persisted at this roll-

up interval indefinitely. A purge

policy defines a minimum length

of time that data must persist

before it is truncated.

Purge

Policy

> Level 3

setting

Purge Data is never purged from the

system before the age value of the

purge policy. Data may, however,

be retained for longer than the

setting as the system waits to find

an acceptable time to purge data.

Two-level policy (including a purge)

Level 1

<= 15 minutes <= 15 minutes Data is persisted at the roll-up

interval defined in the Level 1

policy for either three or 14 days,

depending on the age of the Level

2 setting. If the age of the Level 2

setting is less than or equal to three

days, then the data is persisted for

three days. If the age of the Level 2

setting is between three and 14

days, the data is persisted for 14

days.

Acceptable

age values

Acceptable

roll-up values

Explanation

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