${database} 为数据库的名称 /*1.查看索引（1）单位是GB*/ SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024*1024), 6), ' GB') AS 'Total Index Size' FROM information_schema.TABLES WHERE table_schema LIKE '${
    database}'; /*+------------------+ | Total Index Size | +------------------+ | 1.70 GB | +------------------+*//*（2）单位是MB*/SELECT CONCAT(ROUND(SUM(index_length)/(1024*1024), 6), ' MB') AS 'Total Index Size' FROM information_schema.TABLES WHERE table_schema LIKE '${
    database}';/*   其中“database”为你所要查看的数据库*/ /*2.查看表空间*/SELECT CONCAT(ROUND(SUM(data_length)/(1024*1024*1024), 6), ' GB') AS 'Total Data Size' FROM information_schema.TABLES WHERE table_schema LIKE '${
    database}'; /*+-----------------+ | Total Data Size | +-----------------+ | 3.01 GB | +-----------------+*//*3.查看数据库中所有表的信息*/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 '${
    database}';