Cost_estimate Class Reference

Used to store optimizer cost estimates. More...

#include <handler.h>

Public Member Functions
	Cost_estimate ()
double	total_cost () const
	Returns sum of time-consuming costs, i.e., not counting memory cost. More...
double	get_io_cost () const
double	get_cpu_cost () const
double	get_import_cost () const
double	get_mem_cost () const
bool	is_zero () const
	Whether or not all costs in the object are zero. More...
bool	is_max_cost () const
	Whether or not the total cost is the maximal double. More...
void	reset ()
	Reset all costs to zero. More...
void	set_max_cost ()
	Set current cost to the maximal double. More...
void	multiply (double m)
	Multiply io, cpu and import costs by parameter. More...
Cost_estimate &	operator+= (const Cost_estimate &other)
Cost_estimate	operator+ (const Cost_estimate &other)
Cost_estimate	operator- (const Cost_estimate &other)
bool	operator> (const Cost_estimate &other) const
bool	operator< (const Cost_estimate &other) const
void	add_io (double add_io_cost)
	Add to IO cost. More...
void	add_cpu (double add_cpu_cost)
	Add to CPU cost. More...
void	add_import (double add_import_cost)
	Add to import cost. More...
void	add_mem (double add_mem_cost)
	Add to memory cost. More...

Private Attributes
double	io_cost
	cost of I/O operations More...
double	cpu_cost
	cost of CPU operations More...
double	import_cost
	cost of remote operations More...
double	mem_cost
	memory used (bytes) More...

Detailed Description

Used to store optimizer cost estimates.

The class consists of PODs only: default operator=, copy constructor and destructor are used.

Constructor & Destructor Documentation

Cost_estimate()

Cost_estimate::Cost_estimate ( )

inline

Member Function Documentation

add_cpu()

void Cost_estimate::add_cpu ( double  add_cpu_cost )

inline

Add to CPU cost.

add_import()

void Cost_estimate::add_import ( double  add_import_cost )

inline

Add to import cost.

add_io()

void Cost_estimate::add_io ( double  add_io_cost )

inline

Add to IO cost.

add_mem()

void Cost_estimate::add_mem ( double  add_mem_cost )

inline

Add to memory cost.

get_cpu_cost()

double Cost_estimate::get_cpu_cost ( ) const

inline

get_import_cost()

double Cost_estimate::get_import_cost ( ) const

inline

get_io_cost()

double Cost_estimate::get_io_cost ( ) const

inline

get_mem_cost()

double Cost_estimate::get_mem_cost ( ) const

inline

is_max_cost()

bool Cost_estimate::is_max_cost ( ) const

inline

Whether or not the total cost is the maximal double.

Returns

true if total cost is the maximal double, false otherwise

is_zero()

bool Cost_estimate::is_zero ( ) const

inline

Whether or not all costs in the object are zero.

Returns

true if all costs are zero, false otherwise

multiply()

void Cost_estimate::multiply ( double  m )

inline

Multiply io, cpu and import costs by parameter.

operator+()

Cost_estimate Cost_estimate::operator+ ( const Cost_estimate &  other )

inline

operator+=()

Cost_estimate & Cost_estimate::operator+= ( const Cost_estimate &  other )

inline

operator-()

Cost_estimate Cost_estimate::operator- ( const Cost_estimate &  other )

inline

operator<()

bool Cost_estimate::operator< ( const Cost_estimate &  other ) const

inline

operator>()

bool Cost_estimate::operator> ( const Cost_estimate &  other ) const

inline

reset()

void Cost_estimate::reset ( )

inline

Reset all costs to zero.

set_max_cost()

void Cost_estimate::set_max_cost ( )

inline

Set current cost to the maximal double.

total_cost()

double Cost_estimate::total_cost ( ) const

inline

Returns sum of time-consuming costs, i.e., not counting memory cost.

Member Data Documentation

cpu_cost

double Cost_estimate::cpu_cost

private

cost of CPU operations

import_cost

double Cost_estimate::import_cost

private

cost of remote operations

io_cost

double Cost_estimate::io_cost

private

cost of I/O operations

mem_cost

double Cost_estimate::mem_cost

private

memory used (bytes)

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The documentation for this class was generated from the following file:

• sql/handler.h