Catalog类 参考

Store metadata, such as table statistics. 更多...

#include <catalog.h>

Public 成员函数
	Catalog (const Catalog &)=delete
Catalog &	operator= (const Catalog &)=delete
const TableStats &	get_table_stats (int table_id)
	Retrieves table statistics for a given table_id. 更多...
void	update_table_stats (int table_id, const TableStats &table_stats)
	Updates table statistics for a given table. 更多...

静态 Public 成员函数
static Catalog &	get_instance ()
	Gets the singleton instance of the Catalog. 更多...

Private 属性
mutex	mutex_
unordered_map< int, TableStats >	table_stats_
	A map storing the table statistics indexed by table_id. 更多...

详细描述

Store metadata, such as table statistics.

The Catalog class provides methods to access and update metadata related to tables, such as table statistics. It is designed as a singleton to ensure a single point of management for the metadata.

成员函数说明

get_instance()

static Catalog & Catalog::get_instance ( )

inlinestatic

Gets the singleton instance of the Catalog.

This method ensures there is only one instance of the Catalog.

返回

A reference to the singleton instance of the Catalog.

get_table_stats()

const TableStats & Catalog::get_table_stats

(

int

table_id

)

Retrieves table statistics for a given table_id.

参数

table_id

The identifier of the table for which statistics are requested.

返回

A constant reference to the TableStats of the specified table_id.

update_table_stats()

void Catalog::update_table_stats	(	int	table_id,
		const TableStats &	table_stats
	)

Updates table statistics for a given table.

参数

table_id	The identifier of the table for which statistics are updated.
table_stats	The new table statistics to be set.

类成员变量说明

table_stats_

unordered_map<int, TableStats> Catalog::table_stats_

private

A map storing the table statistics indexed by table_id.

This map is currently not persisted and its persistence is planned via a system table. Table statistics storage.

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该类的文档由以下文件生成:

• src/observer/catalog/catalog.h
• src/observer/catalog/catalog.cpp