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Data Retention Policies & Historical Data Management

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Understanding data retention requirements is critical for both compliance and performance optimization.

Common retention patterns

  1. Short-term: Days to weeks
  2. Medium-term: Months to a year
  3. Long-term: Multiple years
  4. Indefinite: Permanent storage

Example retention policies

Data TypeRetention PeriodAccess FrequencyStorage Strategy
Order details7 yearsFrequent for recent, rare for oldHot storage for 1 year, cold storage for 6 years
Customer profilesIndefiniteFrequentHot storage, regular updates
Click stream data90 daysFrequent for recent onlyHot storage, aggressive aggregation

Questions to ask about data retention

  • "Are there any regulatory requirements for data retention in this domain?"
  • "How does data access frequency change as the data ages?"
  • "Are there different retention policies for different types of data?"
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