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MiniOB 1
MiniOB is one mini database, helping developers to learn how database works.
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cost model in cost-based optimization(CBO) 更多...
#include <cost_model.h>
Public 成员函数 | |
| double | cpu_op () |
| cpu cost of building hash table | |
| double | hash_cost () |
| cpu cost of finding hash bucket | |
| double | hash_probe () |
| cpu cost of finding index | |
| double | index_probe () |
| i/o cost | |
| double | io () |
| double | calculate_cost (Memo *memo, GroupExpr *gexpr) |
Private 属性 | |
| double | CPU_OP = 0.00002 |
| double | HASH_COST = 0.00002 |
| double | HASH_PROBE = 0.00001 |
| double | INDEX_PROBE = 0.00001 |
| double | IO = 0.03 |
cost model in cost-based optimization(CBO)
1.9.5