Oracle in a Nutshell

Name

ASSOCIATE STATISTICS

Synopsis

ASSOCIATE STATISTICS WITH
{COLUMNS [schema.] table_name.column[, [schema.] table_name.column...]
| FUNCTIONS [schema.]function[,[schema.]function...] 
| PACKAGES [schema.]package[,[schema.]package...] 
| INDEXES [schema.]index[,[schema.]index...] 
} 
{USING [schema.]statistics_type 
| DEFAULT COST (cpu_cost,io_cost,network_cost)
| DEFAULT SELECTIVITY default_selectivity 
| TYPES [schema.]type[,[schema.]type...]
}

Defines how statistics are to be computed for the specified database objects. To remove or disassociate statistics from an object, use the DISASSOCIATE STATISTICS statement. New with Oracle8i.

Keywords

COLUMNS

Specifies that a list of columns will be provided.

FUNCTIONS

Specifies that one or more functions will be associated.

PACKAGES

Specifies that one or more packages will be associated.

INDEXES

Specifies that one or more indexes will be associated.

USING statistics_type

Specifies the statistics type being associated.

DEFAULT COST

Specifies that default costs will be provided for CPU, I/O, and the network. This keyword is not valid if the COLUMNS keyword is used.

cpu_cost

Integer representing the CPU cost of a single execution or access.

io_cost

Integer representing the I/O cost of a single execution or access.

network_cost

Integer representing the network cost of a single execution or access.

DEFAULT SELECTIVITY default_selectivity

Specifies an integer between 1 and 100, representing the default selectivity as a percentage. This keyword is not valid if ...