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dbgroup-at-ucsc / dbtune

This research project aims to develop tools in order to make index tuning easier and more effective.
http://users.soe.ucsc.edu/~alkis/tuning/
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Add the cost under failure into the objective function of DIVBIP #321

Closed tqtrung closed 11 years ago

tqtrung commented 11 years ago

The new objective function is the expected cost under the case of failure: Obj = a * TotalCost_under_failure + (1 - a) * TotalCost_normal_condition. Here a is the probability that a node fails.

tqtrung commented 11 years ago

The remaining issue is to impose load-imbalance under the case of failures, which seem to complicate the implementation and probably runs much slower. We will come back to this issue, when the number of template plans can be removed significantly.