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Title
Understanding PI (Performance Investigator) Historical Data Retention and Resolution -
Description
Performance Investigator (PI) displays historical data based on a predefined time pyramid, which controls data resolution and how long it is kept.
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Cause
The PI rollups include all of the statistics which are gathered, including lock information -
Resolution
PI keeps detailed data for a limited time. As time passes, data is rolled up into coarser intervals. The current data retention periods are fixed and cannot be changed.
Time Resolution Retention Period 1 minute 6 hours 15 minutes 3 days 1 hour 2 weeks 6 hours 30 days 1 day 90 days 1 week 2 years For example:
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Data older than 6 hours will only be available at 15-minute resolution or higher.
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After 3 days, 1-minute and 15-minute data is no longer available.
During data rollup, PI selects top records based on the data type, not all records. As a result:
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Some queries or activity may not appear in higher-level summaries.
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Active time may look reduced in rolled-up views.
Note:
On the instance level, Foglight keeps total active time consistent and does not reduce raw data.
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