MySQL show 语句

总览show 语句

show tables from database_name; -- 显示当前数据库中所有表的名称。 
show databases; -- 显示mysql中所有数据库的名称。 
show columns from database_name.table_name; -- 显示表中列名称。 
show grants for user_name; -- 显示一个用户的权限，显示结果类似于grant 命令。 
show index from table_name; -- 显示表的索引。 
show status; -- 显示一些系统特定资源的信息，例如，正在运行的线程数量。 
show variables; -- 显示系统变量的名称和值。 
show processlist; -- 显示系统中正在运行的所有进程，也就是当前正在执行的查询。大多数用户可以查看他们自己的进程，但是如果他们拥有process权限，就可以查看所有人的进程，包括密码。 
show table status; -- 显示当前使用或者指定的database中的每个表的信息。信息包括表类型和表的最新更新时间。 
show privileges; -- 显示服务器所支持的不同权限。 
show create database database_name; -- 显示create database 语句是否能够创建指定的数据库。 
show create table table_name; -- 显示create database 语句是否能够创建指定的数据库。 
show engines; -- 显示安装以后可用的存储引擎和默认引擎。 
show innodb status; -- 显示innoDB存储引擎的状态。 
show logs; -- 显示BDB存储引擎的日志。 
show warnings; -- 显示最后一个执行的语句所产生的错误、警告和通知。 
show errors; -- 只显示最后一个执行语句所产生的错误。 
show [storage] engines; --显示安装后的可用存储引擎和默认引擎。

查看进程

show processlist;

查看目录配置

 show variables like '%dir%';
+-----------------------------------------+----------------------------+
| Variable_name                           | Value                      |
+-----------------------------------------+----------------------------+
| basedir                                 | /usr/                      |
| binlog_direct_non_transactional_updates | OFF                        |
| character_sets_dir                      | /usr/share/mysql/charsets/ |
| datadir                                 | /var/lib/mysql/            |
| ignore_db_dirs                          |                            |
| innodb_data_home_dir                    |                            |
| innodb_log_group_home_dir               | ./                         |
                         |
                          |
| innodb_tmpdir                           |                            |
| innodb_undo_directory                   | .                          |
| lc_messages_dir                         | /usr/share/mysql/          |
| plugin_dir                              | /usr/lib64/mysql/plugin/   |
| slave_load_tmpdir                       | /tmp                       |
| tmpdir                                  | /tmp                       |
+-----------------------------------------+----------------------------+
 rows in set (0.00 sec)

查看字符集配置

mysql> show variables like 'char%';
+--------------------------+----------------------------+
| Variable_name            | Value                      |
+--------------------------+----------------------------+
| character_set_client     | utf8                       |
| character_set_connection | utf8                       |
| character_set_database   | utf8                       |
| character_set_filesystem | binary                     |
| character_set_results    | utf8                       |
| character_set_server     | utf8                       |
| character_set_system     | utf8                       |
| character_sets_dir       | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
 rows in set (0.00 sec)

查看可分配的权限

mysql> show privileges;
+-------------------------+---------------------------------------+-------------------------------------------------------+
| Privilege               | Context                               | Comment                                               |
+-------------------------+---------------------------------------+-------------------------------------------------------+
| Alter                   | Tables                                | To alter the table                                    |
| Alter routine           | Functions,Procedures                  | To alter or drop stored functions/procedures          |
| Create                  | Databases,Tables,Indexes              | To create new databases and tables                    |
| Create routine          | Databases                             | To use CREATE FUNCTION/PROCEDURE                      |
| Create temporary tables | Databases                             | To use CREATE TEMPORARY TABLE                         |
| Create view             | Tables                                | To create new views                                   |
| Create user             | Server Admin                          | To create new users                                   |
| Delete                  | Tables                                | To delete existing rows                               |
| Drop                    | Databases,Tables                      | To drop databases, tables, and views                  |
| Event                   | Server Admin                          | To create, alter, drop and execute events             |
| Execute                 | Functions,Procedures                  | To execute stored routines                            |
| File                    | File access on server                 | To read and write files on the server                 |
| Grant option            | Databases,Tables,Functions,Procedures | To give to other users those privileges you possess   |
| Index                   | Tables                                | To create or drop indexes                             |
| Insert                  | Tables                                | To insert data into tables                            |
| Lock tables             | Databases                             | To use LOCK TABLES (together with SELECT privilege)   |
| Process                 | Server Admin                          | To view the plain text of currently executing queries |
| Proxy                   | Server Admin                          | To make proxy user possible                           |
| References              | Databases,Tables                      | To have references on tables                          |
| Reload                  | Server Admin                          | To reload or refresh tables, logs and privileges      |
| Replication client      | Server Admin                          | To ask where the slave or master servers are          |
| Replication slave       | Server Admin                          | To read binary log events from the master             |
| Select                  | Tables                                | To retrieve rows from table                           |
| Show databases          | Server Admin                          | To see all databases with SHOW DATABASES              |
| Show view               | Tables                                | To see views with SHOW CREATE VIEW                    |
| Shutdown                | Server Admin                          | To shut down the server                               |
| Super                   | Server Admin                          | To use KILL thread, SET GLOBAL, CHANGE MASTER, etc.   |
| Trigger                 | Tables                                | To use triggers                                       |
| Create tablespace       | Server Admin                          | To create/alter/drop tablespaces                      |
| Update                  | Tables                                | To update existing rows                               |
| Usage                   | Server Admin                          | No privileges - allow connect only                    |
+-------------------------+---------------------------------------+-------------------------------------------------------+
 rows in set (0.00 sec)

Log_Error

mysql> show variables like '%log_error%';
+---------------------+---------------------+
| Variable_name       | Value               |
+---------------------+---------------------+
| binlog_error_action | IGNORE_ERROR        |
| log_error           | /var/log/mysqld.log |
+---------------------+---------------------+
 rows in set (0.00 sec)

Show Grants

mysql> show grants for 'root'@'bogon';
+------------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@bogon                                                                                                              |
+------------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'bogon' IDENTIFIED BY PASSWORD '*81F5E21E35407D884A6CD4A731AEBFB6AF209E1B' WITH GRANT OPTION |
| GRANT PROXY ON ''@'' TO 'root'@'bogon' WITH GRANT OPTION                                                                           |
+------------------------------------------------------------------------------------------------------------------------------------+
 rows in set (0.00 sec)