1.查询表占用空间语句：SELECT CONCAT(table_schema,'.',table_name) AS 'Table Name',
table_rows AS 'Number of Rows',
CONCAT(ROUND(data_length/(1024*1024*1024),6),' G') AS 'Data Size',
CONCAT(ROUND(index_length/(1024*1024*1024),6),' G') AS 'Index Size' ,
CONCAT(ROUND((data_length+index_length)/(1024*1024*1024),6),' G') AS'Total'
FROM information_schema.TABLES
WHERE table_schema LIKE '%data_platform%'
ORDER BY `Data Size` desc;