Query to Read All Data at Once
Advantages:
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query navigation after first call very quickly as data completely present in OLAP cache
Disadvantages:
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Initial call slow
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Using characteristics aggregates greatly restricted
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Large memory requirement in the OLAP cache
Recommendation:
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Using the read mode only for small InfoCubes
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Using the read mode only in queries with a few free characteristics
Query to Read Data During Navigation
Advantages:
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Good hit rate in characteristic aggregates
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Quick response times for small hierarchies
Disadvantages:
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Waiting period required in successive runs when selection is not identical to Initial call
Recommendation:
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Using the read mode for small hierarchies
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Using the read mode for large result sets
Query to Read When You Navigate or Expaned Hierarchies
Advantages:
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Initial call of the query quickly because only the necessary data is selected
Disadvantages:
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Selects the least amount of data in the Initial call, so read access to database with modified navigation required
Recommendation:
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Using the read mode when hierarchy aggregates required