INFORMATION_SCHEMA

MySQL :: MySQL 5.5 Reference Manual :: 21 INFORMATION_SCHEMA Tables

https://dev.mysql.com/doc/refman/5.5/en/information-schema.html

INFORMATION_SCHEMA Usage Notes

INFORMATION_SCHEMA is a database within each MySQL instance, the place that stores information about all the other databases that the MySQL server maintains. The INFORMATION_SCHEMA database contains several read-only tables. They are actually views, not base tables, so there are no files associated with them, and you cannot set triggers on them. Also, there is no database directory with that name.

Although you can select INFORMATION_SCHEMA as the default database with a USE statement, you can only read the contents of tables, not perform INSERT,UPDATE, or DELETE operations on them.

问题来源， 删除索引前的存在性检测。

http://dev.mysql.com/doc/refman/5.7/en/statistics-table.html

http://m.blog.csdn.net/lilin_esri/article/details/69944346

查询所有的数据库占用磁盘空间大小

SELECT
TABLE_SCHEMA,
CONCAT(
TRUNCATE (
SUM(DATA_LENGTH) / 1024 / 1024,
2
),
' MB'
) AS data_size,
concat(
TRUNCATE (
SUM(DATA_LENGTH) / 1024 / 1024,
2
),
'MB'
) AS index_size
FROM
information_schema. TABLES
GROUP BY
TABLE_SCHEMA
ORDER BY
DATA_LENGTH DESC;

SELECT
*
FROM
information_schema. TABLES;

查询单个数据库各个表占用磁盘空间大小

SELECT
TABLE_NAME,
CONCAT(
TRUNCATE (DATA_LENGTH / 1024 / 1024, 2),
' MB'
) AS data_size,
CONCAT(
TRUNCATE (INDEX_LENGTH / 1024 / 1024, 2),
' MB'
) AS index_size
FROM
information_schema. TABLES
WHERE
TABLE_SCHEMA = 'mydb'
GROUP BY
TABLE_NAME
ORDER BY
DATA_LENGTH DESC;

统计  表 库  大小

[root@d mysql]# bin/mysql

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 7

Server version: 5.7.15 Source distribution

Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;

+--------------------+

| Database           |

+--------------------+

| information_schema |

| mysql              |

| performance_schema |

| sem                |

| sem_bak            |

| sys                |

+--------------------+

6 rows in set (0.00 sec)

mysql> desc information_schema.tables;

+-----------------+---------------------+------+-----+---------+-------+

| Field           | Type                | Null | Key | Default | Extra |

+-----------------+---------------------+------+-----+---------+-------+

| TABLE_CATALOG   | varchar(512)        | NO   |     |         |       |

| TABLE_SCHEMA    | varchar(64)         | NO   |     |         |       |

| TABLE_NAME      | varchar(64)         | NO   |     |         |       |

| TABLE_TYPE      | varchar(64)         | NO   |     |         |       |

| ENGINE          | varchar(64)         | YES  |     | NULL    |       |

| VERSION         | bigint(21) unsigned | YES  |     | NULL    |       |

| ROW_FORMAT      | varchar(10)         | YES  |     | NULL    |       |

| TABLE_ROWS      | bigint(21) unsigned | YES  |     | NULL    |       |

| AVG_ROW_LENGTH  | bigint(21) unsigned | YES  |     | NULL    |       |

| DATA_LENGTH     | bigint(21) unsigned | YES  |     | NULL    |       |

| MAX_DATA_LENGTH | bigint(21) unsigned | YES  |     | NULL    |       |

| INDEX_LENGTH    | bigint(21) unsigned | YES  |     | NULL    |       |

| DATA_FREE       | bigint(21) unsigned | YES  |     | NULL    |       |

| AUTO_INCREMENT  | bigint(21) unsigned | YES  |     | NULL    |       |

| CREATE_TIME     | datetime            | YES  |     | NULL    |       |

| UPDATE_TIME     | datetime            | YES  |     | NULL    |       |

| CHECK_TIME      | datetime            | YES  |     | NULL    |       |

| TABLE_COLLATION | varchar(32)         | YES  |     | NULL    |       |

| CHECKSUM        | bigint(21) unsigned | YES  |     | NULL    |       |

| CREATE_OPTIONS  | varchar(255)        | YES  |     | NULL    |       |

| TABLE_COMMENT   | varchar(2048)       | NO   |     |         |       |

+-----------------+---------------------+------+-----+---------+-------+

21 rows in set (0.00 sec)

mysql> select * from information_schema.tables limit 5;

+---------------+--------------------+---------------------------------------+-------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------------+

| TABLE_CATALOG | TABLE_SCHEMA       | TABLE_NAME                            | TABLE_TYPE  | ENGINE | VERSION | ROW_FORMAT | TABLE_ROWS | AVG_ROW_LENGTH | DATA_LENGTH | MAX_DATA_LENGTH | INDEX_LENGTH | DATA_FREE | AUTO_INCREMENT | CREATE_TIME         | UPDATE_TIME | CHECK_TIME | TABLE_COLLATION | CHECKSUM | CREATE_OPTIONS | TABLE_COMMENT |

+---------------+--------------------+---------------------------------------+-------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------------+

| def           | information_schema | CHARACTER_SETS                        | SYSTEM VIEW | MEMORY |      10 | Fixed      |       NULL |            384 |           0 |        16434816 |            0 |         0 |           NULL | 2018-11-29 14:37:45 | NULL        | NULL       | utf8_general_ci |     NULL | max_rows=43690 |               |

| def           | information_schema | COLLATIONS                            | SYSTEM VIEW | MEMORY |      10 | Fixed      |       NULL |            231 |           0 |        16704765 |            0 |         0 |           NULL | 2018-11-29 14:37:45 | NULL        | NULL       | utf8_general_ci |     NULL | max_rows=72628 |               |

| def           | information_schema | COLLATION_CHARACTER_SET_APPLICABILITY | SYSTEM VIEW | MEMORY |      10 | Fixed      |       NULL |            195 |           0 |        16357770 |            0 |         0 |           NULL | 2018-11-29 14:37:45 | NULL        | NULL       | utf8_general_ci |     NULL | max_rows=86037 |               |

| def           | information_schema | COLUMNS                               | SYSTEM VIEW | InnoDB |      10 | Dynamic    |       NULL |              0 |       16384 |               0 |            0 |   8388608 |           NULL | NULL                | NULL        | NULL       | utf8_general_ci |     NULL | max_rows=2789  |               |

| def           | information_schema | COLUMN_PRIVILEGES                     | SYSTEM VIEW | MEMORY |      10 | Fixed      |       NULL |           2565 |           0 |        16757145 |            0 |         0 |           NULL | 2018-11-29 14:37:45 | NULL        | NULL       | utf8_general_ci |     NULL | max_rows=6540  |               |

+---------------+--------------------+---------------------------------------+-------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------------+

5 rows in set (0.03 sec)

mysql> select distinct(TABLE_CATALOG) from information_schema.tables ;

+---------------+

| TABLE_CATALOG |

+---------------+

| def           |

+---------------+

1 row in set (0.00 sec)

mysql> select distinct(TABLE_SCHEMA) from information_schema.tables ;

+--------------------+

| TABLE_SCHEMA       |

+--------------------+

| information_schema |

| mysql              |

| performance_schema |

| sem                |

| sem_bak            |

| sys                |

+--------------------+

6 rows in set (0.01 sec)

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 = 'sem';

ERROR 1046 (3D000): No database selected

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 information_schema.tables where TABLE_SCHEMA = 'sem';

+-------------+----------------+--------------+----------------+------------+

| table_name  | data_mb        | index_mb     | all_mb         | table_rows |

+-------------+----------------+--------------+----------------+------------+

| article     |   455.90625000 |   0.00000000 |   455.90625000 |    5827967 |

| cinfo       |     0.01562500 |   0.01562500 |     0.03125000 |          0 |

| cinfo1      |   496.90625000 | 145.70312500 |   642.60937500 |    9256895 |

| cinfo2      |   471.89062500 | 125.70312500 |   597.59375000 |    8754276 |

| cinfo3      |   109.60937500 |  31.57812500 |   141.18750000 |    2268454 |

| cinfoview   |           NULL |         NULL |           NULL |       NULL |

| cinfoview1  |           NULL |         NULL |           NULL |       NULL |

| cinfoview2  |           NULL |         NULL |           NULL |       NULL |

| cinfoview3  |           NULL |         NULL |           NULL |       NULL |

| content     |     0.01562500 |   0.00000000 |     0.01562500 |          0 |

| content1    | 24400.00000000 | 139.70312500 | 24539.70312500 |    7781986 |

| content2    | 26372.00000000 | 125.70312500 | 26497.70312500 |    7713312 |

| content3    |  6749.00000000 |  31.57812500 |  6780.57812500 |    1855395 |

| info        |   443.87500000 |   0.00000000 |   443.87500000 |    8864137 |

| info1       |   486.89062500 |   0.00000000 |   486.89062500 |    9513996 |

| info2       |   320.79687500 |   0.00000000 |   320.79687500 |    7274232 |

| info_c      |     0.01562500 |   0.00000000 |     0.01562500 |          0 |

| info_c1     |     0.01562500 |   0.00000000 |     0.01562500 |          0 |

| info_c2     |     0.01562500 |   0.00000000 |     0.01562500 |          0 |

| infoview    |           NULL |         NULL |           NULL |       NULL |

| infoview1   |           NULL |         NULL |           NULL |       NULL |

| infoview2   |           NULL |         NULL |           NULL |       NULL |

| semtags     |     0.10937500 |   0.01562500 |     0.12500000 |         50 |

| tags        |   553.98437500 |   0.00000000 |   553.98437500 |    9242997 |

| tags1       |   504.95312500 |   0.00000000 |   504.95312500 |    8448984 |

| tags2       |   526.96875000 |   0.00000000 |   526.96875000 |    8797155 |

| tags3       |   131.64062500 |  31.57812500 |   163.21875000 |    2243969 |

| tags_201703 |    15.51562500 |   0.10937500 |    15.62500000 |       5374 |

| tags_201704 |     0.01562500 |   0.01562500 |     0.03125000 |          0 |

| tags_201705 |     0.01562500 |   0.01562500 |     0.03125000 |          0 |

| tags_201706 |     0.01562500 |   0.01562500 |     0.03125000 |          0 |

| tags_201707 |     0.01562500 |   0.01562500 |     0.03125000 |          0 |

+-------------+----------------+--------------+----------------+------------+

32 rows in set (0.00 sec)

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 information_schema.tables where TABLE_SCHEMA = 'sem_bak';

+------------+------------+------------+------------+------------+

| table_name | data_mb    | index_mb   | all_mb     | table_rows |

+------------+------------+------------+------------+------------+

| info1      | 0.01562500 | 0.00000000 | 0.01562500 |          2 |

| semtags    | 0.01562500 | 0.01562500 | 0.03125000 |          4 |

+------------+------------+------------+------------+------------+

2 rows in set (0.00 sec)

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;

+--------------------+----------------+----------------+--------------+--------+------------+

| table_schema       | total_mb       | data_mb        | index_mb     | tables | today      |

+--------------------+----------------+----------------+--------------+--------+------------+

| information_schema |     0.15625000 |     0.15625000 |   0.00000000 |     61 | 2018-11-29 |

| mysql              |     2.42948151 |     2.21561432 |   0.21386719 |     31 | 2018-11-29 |

| performance_schema |     0.00000000 |     0.00000000 |   0.00000000 |     87 | 2018-11-29 |

| sem                | 62671.93750000 | 62040.18750000 | 631.75000000 |     32 | 2018-11-29 |

| sem_bak            |     0.04687500 |     0.03125000 |   0.01562500 |      2 | 2018-11-29 |

| sys                |     0.01562500 |     0.01562500 |   0.00000000 |    101 | 2018-11-29 |

+--------------------+----------------+----------------+--------------+--------+------------+

6 rows in set (0.04 sec)

mysql>

　　

INFORMATION_SCHEMA.STATISTICS 统计 表 库 大小的更多相关文章

  1. 查看mysql库大小，表大小，索引大小

    查看所有库的大小 mysql> use information_schema; Database changed mysql> selectconcat(round(sum(DATA_LE ...

  2. MySQL 库大小、表大小、索引大小查询命令

    1.进去指定schema 数据库(存放了其他的数据库的信息)     mysql> use information_schema; 2.查询所有数据的大小      mysql> sele ...

  3. MySQL查看库表的大小

    MySQL数据库空间使用情况查询 如果想知道MySQL数据库中每个表占用的空间.表记录的行数的话,可以打开MySQL的 information_schema 数据库.在该库中有一个 TABLES 表, ...

  4. [转]【mysql监控】查看mysql库大小，表大小，索引大小

    本文转自:http://blog.sina.com.cn/s/blog_4c197d420101fbl9.html 查看所有库的大小 mysql> use information_schema; ...

  5. SQL Server查看库、表占用空间大小

    转自:https://blog.csdn.net/yenange/article/details/50493580 查询数据文件与日志文件占用情况,查看数据大小,查看库大小 1. 查看数据文件占用(权 ...

  6. 查看mysql库中所有表的大小和记录数

    查看mysql库中所有表的大小和记录数 ,), 'MB') as total_size FROM information_schema.TABLES WHERE TABLE_SCHEMA='datab ...

  7. Atitit.mssql 数据库表记录数and 表体积大小统计

    Atitit.mssql 数据库表记录数and 表体积大小统计 1. EXEC   sp_MSforeachtable   "EXECUTE   sp_spaceused   '?'&quo ...

  8. MySQL查看表占用空间大小(转)

    MySQL查看表占用空间大小(转) //先进去MySQL自带管理库:information_schema //自己的数据库:dbwww58com_kuchecarlib //自己的表:t_carmod ...

  9. MySQL查看数据库表容量大小

    本文介绍MySQL查看数据库表容量大小的命令语句,提供完整查询语句及实例,方便大家学习使用. 1.查看所有数据库容量大小 select table_schema as '数据库', sum(table ...

随机推荐

  1. [持续更新]Windows Programming常见Hungarian Notation/Abbreviation大全

    Windows Programming必须了解的naming-convention,下面解释每个前缀/缩略词的含义,如果含义的解释一行放不下的,就把解释放在一个引用框里 PrefixMeaningCS ...

  2. 一种基于匹配回朔的 css3 选择器引擎实现

    介绍 CSS 选择器是一种应用于 DOM 节点查找场景的特定微型语法, 本质上和正则表达式一样都是一种模式匹配语言,灵活使用可以方便得获取指定位置的节点集合. 目前 W3C 推荐标准为 Selecto ...

  3. crc32 冗余加密校验

    在数据存储和传输中使用 在ts中要对pat  和pmt 中的数据进行冗余校验 http://blog.chinaunix.net/uid-20321537-id-1966721.html

  4. pip下载默认绕过代理

    centos7下使用pip7.1.0安装软件,在shell下设置了全局http_proxy和https_proxy,但是每次都遇到网络超时问题, 后来使用pip install xxx --proxy ...

  5. 利用flume+kafka+storm+mysql构建大数据实时系统

    架构图

  6. maven环境的配置

    http://maven.oschina.net/help.html     --配置说明 http://maven.oschina.net/index.html#nexus-search;quick ...

  7. 如何在ChemDraw中缩短双键长度

    双键是化学绘图软件ChemDraw在绘制化学图形的过程中会遇到各种各样的化学结构.而双键就是一种常见的化学基础结构,有的用户希望自己绘制的图形更加的美观,希望可以调整双键的长度并且不影响到其他的结构. ...

  8. iOS开发之--搭建本地的SVN服务器

    近期入职的新公司,后台没有分配svn账号,需要在本地搭建一个服务器,方便和代码,看了看网上的教程,一直有这样那样的问题, 其中最主要的问题还是路径拼接的问题,最后终于解决了,特在此分享下,如果大家有更 ...

  9. 苹果发布【新开发语言】Swift

    Swift is a multi-tenant, highly scalable and durable object storage system that was designed to stor ...

  10. Java之自动拆装箱

    顾名思义,自动拆装箱就是将基本类型和包装类进行自动的互相转换. JDK5.0后,将自动装箱/拆箱引Java中. 自动装箱的过程:每当需要一种类型的对象时,这种基本类型就自动地封装到与它相同类型的包装中 ...