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geqo_effort

GEQO: effort is used to set the default for other GEQO parameters

Controls the trade-off between planning time and query plan quality in GEQO. This variable must be an integer in the range from 1 to 10. The default value is five. Larger values increase the time spent doing query planning, but also increase the likelihood that an efficient query plan will be chosen.

geqo_effort doesn't actually do anything directly; it is only used to compute the default values for the other variables that influence GEQO behavior (described below). If you prefer, you can set the other parameters by hand instead.

Official doc
Type: integer
Default: 5
Min: 1
Max: 10
Context: user
Restart: false

On StackOverflow

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