mysql怎么查询数据库容量

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;

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

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 where table_schema = 'your_table_name';

SELECT
    table_schema AS '数据库',
    table_name AS '表名',
    table_rows AS '记录数',
    TRUNCATE ( data_length / 1024 / 1024, 2 ) AS '数据容量(MB)',
    TRUNCATE ( index_length / 1024 / 1024, 2 ) AS '索引容量(MB)' 
FROM
    information_schema.TABLES 
WHERE
    table_schema = '指定的库名' 
ORDER BY
    data_length DESC,
    index_length DESC;