
214 Automated Physical Database Design and Tuning
400 500 700 800
Expected Cost
Expected Size (GB)
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FIGURE 11.8 Nondominated configurations for relaxed S70.
the reason for the original specification resulting in no solutions is that the
smallest such configuration requires 2.4 GB.
Suppose that we pick this smallest configuration in Figure 11.8 (after all,
our initial hard constraint limited the storage to 2 GB). Figure 11.9 contrasts
the execution cost of the queries in the workload under both this configuration
and the one obtained when optimizing only for storage (i.e., when dropping
the S70 constraint) but giving the 2.4 GB storage bound ...