Initialization Parameters, 123 of 188

OPTIMIZER_MAX_PERMUTATIONS

Parameter type:
Integer

Parameter class:
Dynamic. Scope = ALTER SESSION, ALTER SYSTEM.

Default value:
80000

Range of values:
4 to 2³² (~4.3 billion)

OPTIMIZER_MAX_PERMUTATIONS restricts the number of permutations of the tables the optimizer will consider in queries with joins. Such a restriction ensures that the parse time for the query stays within acceptable limits. However, a slight risk exists that the optimizer will overlook a good plan it would otherwise have found.

The default value for this parameter is 80000, which corresponds to the no limitation at all. Setting this parameter to a value less than 1000 normally ensures parse times of a few seconds or less.

Parameter type:	Integer
Parameter class:	Dynamic. Scope = `ALTER` `SESSION`, `ALTER` `SYSTEM.`
Default value:	80000
Range of values:	4 to 2³² (~4.3 billion)
`OPTIMIZER_MAX_PERMUTATIONS` restricts the number of permutations of the tables the optimizer will consider in queries with joins. Such a restriction ensures that the parse time for the query stays within acceptable limits. However, a slight risk exists that the optimizer will overlook a good plan it would otherwise have found.
The default value for this parameter is 80000, which corresponds to the no limitation at all. Setting this parameter to a value less than 1000 normally ensures parse times of a few seconds or less.