The class hold dynamic table statistics for a table. More...

#include <tablespace_stats.h>

Public Member Functions
	Tablespace_statistics ()

bool	is_stat_cached (const String &tablespace_name, const String &file_name)
	Check if the stats are cached for given tablespace_name and file_name. More...

void	cache_stats (const String &tablespace_name, const String &file_name, ha_tablespace_statistics &stats)
	Store the statistics form the given handler. More...

bool	read_stat (THD thd, const String &tablespace_name_ptr, const String &file_name_ptr, const String &engine_name_ptr, const char ts_se_private_data)
	Read dynamic tablespace statistics from SE API OR by reading cached statistics from Query_block. More...

void	invalidate_cache (void)

void	mark_as_error_found (const String &tablespace_name, const String &file_name)
	Mark that error was found for the given key. More...

void	get_stat (enum_tablespace_stats_type stype, ulonglong *result)
	Return statistics of the a given type. More...

void	get_stat (enum_tablespace_stats_type stype, dd::String_type *result)

bool	is_valid () const
	Predicate for determinig if cache is valid. More...

Public Attributes
ha_tablespace_statistics	m_stats

Private Member Functions
void	set_stat_cached (const String &tablespace_name, const String &file_name)
	Mark the cache as valid for a given table. More...

String_type	form_key (const String &tablespace_name, const String &file_name)
	Build a key representing the table for which stats are cached. More...

bool	check_error_for_key (const String &tablespace_name, const String &file_name)
	Check if we have seen a error. More...

bool	read_stat_from_SE (THD thd, const String &tablespace_name_ptr, const String &file_name_ptr, const String &engine_name_ptr, const char ts_se_private_data)
	Read dynamic tablespace statistics from SE API. More...

Private Attributes
String_type	m_key

bool	m_found_error

Detailed Description

The class hold dynamic table statistics for a table.

This cache is used by internal UDF's defined for the purpose of INFORMATION_SCHEMA queries which retrieve dynamic table statistics. The class caches statistics for just one table.

Overall aim of introducing this cache is to avoid making multiple calls to same SE API to retrieve the statistics.

Constructor & Destructor Documentation

◆ Tablespace_statistics()

dd::info_schema::Tablespace_statistics::Tablespace_statistics ( )

inline

Member Function Documentation

◆ cache_stats()

void dd::info_schema::Tablespace_statistics::cache_stats	(	const String &	tablespace_name,
		const String &	file_name,
		ha_tablespace_statistics &	stats
	)

inline

Store the statistics form the given handler.

Parameters

tablespace_name	- Tablespace name.
file_name	- File name.
stats	- ha_tablespace_statistics.

◆ check_error_for_key()

bool dd::info_schema::Tablespace_statistics::check_error_for_key	(	const String &	tablespace_name,
		const String &	file_name
	)

inlineprivate

Check if we have seen a error.

Parameters

tablespace_name	- Tablespace name.
file_name	- File name.

Returns: true if there is error reported. false if not.

◆ form_key()

String_type dd::info_schema::Tablespace_statistics::form_key	(	const String &	tablespace_name,
		const String &	file_name
	)

inlineprivate

Build a key representing the table for which stats are cached.

Parameters

tablespace_name	- Tablespace name.
file_name	- File name.

Returns: String_type representing the key.

◆ get_stat() [1/2]

void dd::info_schema::Tablespace_statistics::get_stat	(	enum_tablespace_stats_type	stype,
		dd::String_type *	result
	)

◆ get_stat() [2/2]

void dd::info_schema::Tablespace_statistics::get_stat	(	enum_tablespace_stats_type	stype,
		ulonglong *	result
	)

Return statistics of the a given type.

Parameters

	stype	Type of statistics requested.
[out]	result	Value for stype.

◆ invalidate_cache()

void dd::info_schema::Tablespace_statistics::invalidate_cache ( void )

inline

◆ is_stat_cached()

bool dd::info_schema::Tablespace_statistics::is_stat_cached	(	const String &	tablespace_name,
		const String &	file_name
	)

inline

Check if the stats are cached for given tablespace_name and file_name.

Parameters

tablespace_name	- Tablespace name.
file_name	- File name.

Returns: true if stats are cached, else false.

◆ is_valid()

bool dd::info_schema::Tablespace_statistics::is_valid ( void ) const

inline

Predicate for determinig if cache is valid.

◆ mark_as_error_found()

void dd::info_schema::Tablespace_statistics::mark_as_error_found	(	const String &	tablespace_name,
		const String &	file_name
	)

inline

Mark that error was found for the given key.

The combination of tablespace and file name forms the key.

Parameters

tablespace_name	- Tablespace name.
file_name	- File name.

◆ read_stat()

bool dd::info_schema::Tablespace_statistics::read_stat	(	THD *	thd,
		const String &	tablespace_name_ptr,
		const String &	file_name_ptr,
		const String &	engine_name_ptr,
		const char *	ts_se_private_data
	)

Read dynamic tablespace statistics from SE API OR by reading cached statistics from Query_block.

Parameters

thd	- Current thread.
tablespace_name_ptr	- Tablespace name of which we need stats.
file_name_ptr	- File name.
engine_name_ptr	- Engine name.
ts_se_private_data	- Tablespace se private data.

Returns: true if statistics were not fetched from SE, otherwise false.

◆ read_stat_from_SE()

bool dd::info_schema::Tablespace_statistics::read_stat_from_SE	(	THD *	thd,
		const String &	tablespace_name_ptr,
		const String &	file_name_ptr,
		const String &	engine_name_ptr,
		const char *	ts_se_private_data
	)

private

Read dynamic tablespace statistics from SE API.

Parameters

thd	- Current thread.
tablespace_name_ptr	- Tablespace name of which we need stats.
file_name_ptr	- File name.
engine_name_ptr	- Engine name.
ts_se_private_data	- Tablespace se private data.

Returns: true if statistics were not fetched from SE, otherwise false.

◆ set_stat_cached()

void dd::info_schema::Tablespace_statistics::set_stat_cached	(	const String &	tablespace_name,
		const String &	file_name
	)

inlineprivate

Mark the cache as valid for a given table.

This creates a key for the cache element. We store just a single table statistics in this cache.

Parameters

tablespace_name	- Tablespace name.
file_name	- File name.

Member Data Documentation

◆ m_found_error

bool dd::info_schema::Tablespace_statistics::m_found_error

private

◆ m_key

String_type dd::info_schema::Tablespace_statistics::m_key

private

◆ m_stats

ha_tablespace_statistics dd::info_schema::Tablespace_statistics::m_stats

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

sql/dd/info_schema/tablespace_stats.h
sql/dd/info_schema/tablespace_stats.cc

Public Member Functions

Public Attributes

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ Tablespace_statistics()

Member Function Documentation

◆ cache_stats()

◆ check_error_for_key()

◆ form_key()

◆ get_stat() [1/2]

◆ get_stat() [2/2]

◆ invalidate_cache()

◆ is_stat_cached()

◆ is_valid()

◆ mark_as_error_found()

◆ read_stat()

◆ read_stat_from_SE()

◆ set_stat_cached()

Member Data Documentation

◆ m_found_error

◆ m_key

◆ m_stats