opt_costconstantcache.h File Reference

#include <assert.h>
#include <stddef.h>
#include "mysql/components/services/bits/mysql_mutex_bits.h"
#include "mysql/psi/mysql_mutex.h"
#include "sql/opt_costconstants.h"

Go to the source code of this file.

Classes
class	Cost_constant_cache
	This class implements a cache for "cost constant sets". More...

Functions
void	init_optimizer_cost_module (bool enable_plugins)
	Initializes the optimizer cost module. More...
void	delete_optimizer_cost_module ()
	Deletes the optimizer cost module. More...
void	reload_optimizer_cost_constants ()
	Reloads the optimizer cost constants from the cost constant tables. More...

Function Documentation

delete_optimizer_cost_module()

void delete_optimizer_cost_module

(

)

Deletes the optimizer cost module.

This should be called when the server stops to release allocated resources.

init_optimizer_cost_module()

void init_optimizer_cost_module

(

bool

enable_plugins

)

Initializes the optimizer cost module.

This should be done during startup from mysqld.cc.

reload_optimizer_cost_constants()

void reload_optimizer_cost_constants

(

)

Reloads the optimizer cost constants from the cost constant tables.

Note

In order to read the cost constant tables, a THD is needed. This function will create a new temporary THD that will be used for this. In case the caller already has a THD this will not be used.