May 2017
Beginner
416 pages
10h 37m
English
Content preview from Mastering PostgreSQL 9.6
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Understanding genetic query optimization
The result of the planning process is key to achieving superior performance. As shown in this chapter, planning is far from trivial and involves various complex calculations. The more tables are touched by a query, the more complicated planning will become. The more tables there are, the mores choices the planner will have. Logically, planning time will increase. At some point planning will take so long that performing the classical exhaustive search is not feasible anymore. On top of that, the errors made during planning are so great anyway that finding the theoretically best plan does not necessarily lead to the best plan in terms of runtime.
The genetic query optimization (GEQO) can come to the ...
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