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mysqlshow：数据库对象查看工具，用来快速查找存在哪些数据库、数据库中的表、表中的列或索引。
选项：--count 显示数据库和表的统计信息
-k 显示指定的表中的索引
-i 显示表的状态信息
不带任何参数显示所有数据库
[root@www mysql-5.6.30]# mysqlshow
+--------------------+
| Databases |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
+--------------------+
不指定数据库，显示数据库和表的统计信息
[root@www mysql-5.6.30]# mysqlshow --count
+--------------------+--------+--------------+
| Databases | Tables | Total Rows |
+--------------------+--------+--------------+
| information_schema | 59 | 13157 |
| mysql | 28 | 2474 |
| performance_schema | 52 | 16615 |
| test | 2 | 24 |
+--------------------+--------+--------------+
4 rows in set.
指定数据库，显示统计信息
[root@www mysql-5.6.30]# mysqlshow -uroot test --count
Database: test
+----------+----------+------------+
| Tables | Columns | Total Rows |
+----------+----------+------------+
| backt118 | 4 | 12 |
| t118 | 4 | 12 |
+----------+----------+------------+
2 rows in set.
指定数据库和表，显示统计信息
[root@www mysql-5.6.30]# mysqlshow -uroot test t118 --count
Database: test Table: t118 Rows: 12
+---------+----------+-----------------+------+-----+---------+-------+---------------------------------+---------+
| Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment |
+---------+----------+-----------------+------+-----+---------+-------+---------------------------------+---------+
| name | char(10) | utf8_general_ci | YES | MUL | | | select,insert,update,references | |
| age | int(3) | | YES | | | | select,insert,update,references | |
| chushen | date | | YES | | | | select,insert,update,references | |
| shengao | int(3) | | YES | | | | select,insert,update,references | |
+---------+----------+-----------------+------+-----+---------+-------+---------------------------------+---------+
显示指定表所有的索引，前部分是表的结构，后部分是表的索引信息
[root@www mysql-5.6.30]# mysqlshow -uroot test t118 -k
Database: test Table: t118
+---------+----------+-----------------+------+-----+---------+-------+---------------------------------+---------+
| Field | Type | Collation | Null | Key | Default | Extra | Privileges | Comment |
+---------+----------+-----------------+------+-----+---------+-------+---------------------------------+---------+
| name | char(10) | utf8_general_ci | YES | MUL | | | select,insert,update,references | |
| age | int(3) | | YES | | | | select,insert,update,references | |
| chushen | date | | YES | | | | select,insert,update,references | |
| shengao | int(3) | | YES | | | | select,insert,update,references | |
+---------+----------+-----------------+------+-----+---------+-------+---------------------------------+---------+
+-------+------------+------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| Table | Non_unique | Key_name | Seq_in_index | Column_name | Collation | Cardinality | Sub_part | Packed | Null | Index_type | Comment | Index_comment |
+-------+------------+------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
| t118 | 1 | index_name | 1 | name | A | 12 | | | YES | BTREE | | |
| t118 | 1 | index_ccc | 1 | name | A | 12 | | | YES | BTREE | | |
+-------+------------+------------+--------------+-------------+-----------+-------------+----------+--------+------+------------+---------+---------------+
显示表的状态信息
[root@www mysql-5.6.30]# mysqlshow -i -uroot test t118
Database: test Wildcard: t118
+------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+
| Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment |
+------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+
| t118 | InnoDB | 10 | Compact | 12 | 1365 | 16384 | 0 | 0 | 0 | | 2017-04-29 22:33:47 | | | utf8_general_ci | | | |
+------+--------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+---------------------+-------------+------------+-----------------+----------+----------------+---------+
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