mysql> select table_schema,sum(data_length)/1024/1024 as data_length,sum(index_length)/1024/1024 \
as index_length,sum(data_length+index_length)/1024/1024 as sum from information_schema.tables;
+--------------------+---------------+--------------+---------------+
| table_schema | data_length | index_length | sum |
+--------------------+---------------+--------------+---------------+
| information_schema | 2734.92757511 | 86.27539063 | 2821.20296574 |
+--------------------+---------------+--------------+---------------+

2、查看该实例下各个库大小

mysql> select table_schema, sum(data_length+index_length)/1024/1024 as total_mb, \
sum(data_length)/1024/1024 as data_mb, sum(index_length)/1024/1024 as index_mb, \
count(*) as tables, curdate() as today from information_schema.tables group by table_schema order by 2 desc;
+--------------------+---------------+---------------+-------------+--------+------------+
| table_schema | total_mb | data_mb | index_mb | tables | today |
+--------------------+---------------+---------------+-------------+--------+------------+
| data_12345670 | 2820.59610939 | 2734.3960 | 86.19921875 | 65 | 2015-11-02 |
| mysql | 0.60579967 | 0.53744030 | 0.06835938 | 14 | 2015-11-02 |
| information_schema | 0.00781250 | 0.00000000 | 0.00781250 | 35 | 2015-11-02 |
+--------------------+---------------+---------------+-------------+--------+------------+

3、查看单个库的大小

mysql> select concat(truncate(sum(data_length)/1024/1024,2),'mb') as data_size, \
concat(truncate(sum(max_data_length)/1024/1024,2),'mb') as max_data_size, \
concat(truncate(sum(data_free)/1024/1024,2),'mb') as data_free, \
concat(truncate(sum(index_length)/1024/1024,2),'mb') as index_size\
 from information_schema.tables where table_schema = 'erongtu_tyb2014'; 
+-----------+------------------+-----------+------------+
| data_size | max_data_size | data_free | index_size |
+-----------+------------------+-----------+------------+
| 2734.40mb | 83483426815.99mb | 14.06mb | 86.19mb |
+-----------+------------------+-----------+------------+

4、查看单个表的状态

mysql> show table status from data_12345670 where name = 'data_12345670_ss' \G
*************************** 1. row ***************************
 Name: data_12345670_ss
 Engine: InnoDB
 Version: 10
 Row_format: Compact
 Rows: 840065
 Avg_row_length: 477
 Data_length: 401473536
Max_data_length: 0
 Index_length: 0
 Data_free: 6291456
 Auto_increment: 882251
 Create_time: 2015-09-07 17:24:18
 Update_time: NULL
 Check_time: NULL
 Collation: utf8_general_ci
 Checksum: NULL
 Create_options:
 Comment:
1 row in set (0.00 sec)

5、查看单库下所有表的状态

mysql> select table_name, (data_length/1024/1024) as data_mb , (index_length/1024/1024) \
as index_mb, ((data_length+index_length)/1024/1024) as all_mb, table_rows \
from tables where table_schema = 'data_12345670';
+---------------------------+---------------+-------------+---------------+------------+
| table_name | data_mb | index_mb | all_mb | table_rows |
+---------------------------+---------------+-------------+---------------+------------+
| ss_daccount | 0.23437500 | 0.10937500 | 0.34375000 | 4481 |
| ss_daccount_log | 2.48262787 | 0.58496094 | 3.06758881 | 27248 |
| ss_daccount_type | 0.00025558 | 0.00195313 | 0.00220871 | 8 |
| ss_daccountlog | 221.61502457 | 22.66113281 | 244.27615738 | 1045462 |
| ss_dactives | 0.00178146 | 0.00195313 | 0.00373459 | 7 |
| ss_dadmin | 0.00268173 | 0.00195313 | 0.00463486 | 19 |
| ss_dadmin_log | 0.36599731 | 0.05175781 | 0.41775513 | 5191 |
| ss_dadmin_nav | 0.01562500 | 0.00000000 | 0.01562500 | 46 |
| ss_dadmin_role | 0.01562500 | 0.01562500 | 0.03125000 | 5 |
| ss_dadvertisement | 0.07812500 | 0.00000000 | 0.07812500 | 486 |
| ss_dadvertisement_click | 382.87500000 | 0.00000000 | 382.87500000 | 1023350 |
| ss_dadvertisement_content | 0.10937500 | 0.01562500 | 0.12500000 | 105 |
| ss_dapplication | 3.23010635 | 0.02441406 | 3.25452042 | 1859 |
| ss_dapplication_bak | 2.25843048 | 0.01269531 | 2.27112579 | 738 |
| ss_dapplication_comment | 0.88685226 | 0.055606 | 0.94251633 | 5454 |
| ss_dapplication_material | 0.00187683 | 0.00195313 | 0.00382996 | 16 |
| ss_dapplication_user | 0.90316010 | 0.10839844 | 1.01155853 | 8861 |
| ss_darea | 1.05803299 | 0.88769531 | 1.94572830 | 45051 |
| ss_dauthentication | 0.00072861 | 0.00195313 | 0.00268173 | 13 |
| ss_dbbs_relatedlink | 0.01562500 | 0.00000000 | 0.01562500 | 12 |
| ss_dborrow | 0.047325 | 0.00390625 | 0.05123520 | 153 |
| ss_dborrow_collection | 27.61576080 | 13.99023438 | 41.60599518 | 221169 |
| ss_dborrow_lz | 0.00000000 | 0.00097656 | 0.00097656 | 0 |
| ss_dborrow_tender | 24.62931824 | 18.27050781 | 42.982605 | 147411 |
| ss_dcash | 6.40177155 | 1.97949219 | 8.38126373 | 42807 |
| ss_dcp_block | 0.04687500 | 0.01562500 | 0.06250000 | 37 |
| ss_dcp_item | 0.09375000 | 0.00000000 | 0.09375000 | 134 |
| ss_dedu_member | 0.01562500 | 0.00000000 | 0.01562500 | 13 |
| ss_dinfo_article | 78.76256561 | 1.19433594 | 79.95690155 | 10038 |
| ss_dinfo_channel | 0.01562500 | 0.00000000 | 0.01562500 | 56 |
| ss_dinfo_comment | 0.32812500 | 0.00000000 | 0.32812500 | 1206 |
| ss_dinfo_nav | 0.01562500 | 0.00000000 | 0.01562500 | 27 |
| ss_dinfo_p2pdata | 0.90237427 | 0.29101563 | 1.1933 | 29569 |
| ss_dinfo_p2pdata_0 | 0.04687500 | 0.00000000 | 0.04687500 | 275 |
| ss_dinfo_photo | 0.23437500 | 0.00000000 | 0.23437500 | 71 |
| ss_dinfo_project | 0.06250000 | 0.00000000 | 0.06250000 | 67 |
| ss_dinfo_seekdata | 35.53404236 | 0.062500 | 36.17466736 | 5002 |
| ss_dinfo_tagname | 0.01562500 | 0.00000000 | 0.01562500 | 18 |
| ss_dinfo_testinfo | 0.01562500 | 0.00000000 | 0.01562500 | 21 |
| ss_dinfo_video | 0.91273117 | 0.00781250 | 0.92054367 | 207 |
| ss_djiao | 0.01562500 | 0.00000000 | 0.01562500 | 3 |
| ss_dliberty | 3.79615784 | 0.27734375 | 4.07350159 | 23108 |
| ss_dliberty_item | 3.08350754 | 1.24414063 | 4.327816 | 51113 |
| ss_dloan | 0.00000000 | 0.00390625 | 0.00390625 | 0 |
| ss_dmarke | 0.01973343 | 0.00390625 | 0.02363968 | 125 |
| ss_dmedal | 0.00000000 | 0.00097656 | 0.00097656 | 0 |
| ss_dmember_comment | 0.00995636 | 0.00195313 | 0.01190948 | 87 |
| ss_dmembers | 6.73762321 | 0.33203125 | 7.06965446 | 30717 |
| ss_dmembers_identity | 0.10503769 | 0.00976563 | 0.11480331 | 784 |
| ss_dnewyear | 0.00308609 | 0.00195313 | 0.00503922 | 32 |
| ss_drecharge | 29.13045883 | 10.23925781 | 39.369716 | 221220 |
| ss_dsalon_click | 0.00586700 | 0.00195313 | 0.00782013 | 31 |
| ss_dsalon_comment | 0.07812500 | 0.00000000 | 0.07812500 | 213 |
| ss_dsalon_content | 0.14062500 | 0.00000000 | 0.14062500 | 653 |
| ss_dsalon_ticket | 0.00093079 | 0.00195313 | 0.00288391 | 20 |
| ss_dsignin | 0.37500000 | 0.00000000 | 0.37500000 | 7177 |
| ss_dtemplate | 0.157213 | 0.03808594 | 0.19530487 | 2838 |
| ss_dwd_answers | 2.51562500 | 0.00000000 | 2.51562500 | 5420 |
| ss_dwd_classify | 0.01562500 | 0.00000000 | 0.01562500 | 12 |
| ss_dwd_collection | 0.01562500 | 0.00000000 | 0.01562500 | 2 |
| ss_dwd_questions | 1.51562500 | 0.00000000 | 1.51562500 | 3614 |
| ss_dwget | 14.69999695 | 13.02929688 | 1907.72929382 | 1187574 |
| ss_dzhuanti_bolanhui | 0.00419235 | 0.00195313 | 0.00614548 | 20 |
| click | 0.00000000 | 0.00097656 | 0.00097656 | 0 |
| ss_account | 0.14062500 | 0.07812500 | 0.21875000 | 1871 |
+---------------------------+---------------+-------------+---------------+------------+