select CONCAT('|',COLUMN_NAME,'|',IF(COLUMN_COMMENT,1,0),'|') from information_schema.COLUMNS where table_name = 'web_site'; ##markdown

show global variables like "%timeout%"; ##查询数据库超时设置

查询数据库大小Mb
SELECT SUM(data_size+index_size) FROM 
(SELECT
    table_schema,
    concat(
        TRUNCATE (
            sum(data_length) / 1024 / 1024,
            2
        )
    ) AS data_size,
    concat(
        TRUNCATE (
            sum(index_length) / 1024 / 1024,
            2
        )
    ) AS index_size
FROM
    information_schema. TABLES
GROUP BY
    table_schema
ORDER BY
    data_length DESC) AS t