常用MySql数据库查询

单库容量

SELECT 
    table_name AS 'Table Name',
    table_rows AS 'Number of Rows',
    ROUND((data_length + index_length) / 1024 / 1024, 2) AS 'Total Size (MB)',
    ROUND(data_length / 1024 / 1024, 2) AS 'Data Size (MB)',
    ROUND(index_length / 1024 / 1024, 2) AS 'Index Size (MB)'
FROM 
    information_schema.tables
WHERE 
    table_schema = 'xxxxx'
ORDER BY 
    data_length + index_length DESC;

所有库容量

SELECT
	table_schema AS '数据库',
	sum( table_rows ) AS '记录数',
	sum(
	TRUNCATE ( data_length / 1024 / 1024, 2 )) AS '数据容量(MB)',
	sum(
	TRUNCATE ( index_length / 1024 / 1024, 2 )) AS '索引容量(MB)' 
FROM
	information_schema.TABLES 
GROUP BY
	table_schema 
ORDER BY
	sum( data_length ) DESC,
	sum( index_length ) DESC;

所有表容量

SELECT 
    table_schema AS '数据库',
    table_name AS '表名',
    table_rows AS '记录数',
    ROUND((data_length + index_length) / 1024 / 1024, 2) AS 'Total Size (MB)',
    ROUND(data_length / 1024 / 1024, 2) AS '数据容量 (MB)',
    ROUND(index_length / 1024 / 1024, 2) AS '索引容量 (MB)'
FROM 
    information_schema.tables
WHERE 
    table_schema NOT IN ('information_schema', 'mysql', 'performance_schema', 'sys')
ORDER BY 
    table_schema, 
    (data_length + index_length) DESC;

库清理

OPTIMIZE TABLE example_table;