show processlist; only list the first 100, if you want to list all, please use show full processlist;
show columns from table_name from database_name; 或show columns from database_name.table_name;或show fields;
Explanation: Display the column names in the table (same effect as the desc table_name command)
Check the number of connections and status
show variables like '%max_connections%'
After logging in to MySQL from the command line. Set the new MySQL maximum number of connections to 200:
MySQL> set global max_connections=200.
show processlist;
KILL QUERY thread_id;
show index from user;
or
show keys from user;
Explanation: Display the index of the table
show status;
Explanation: Displays information about some system-specific resources, for example, the number of running threads
show variables;
Explanation: Display the names and values of system variables
show privileges;
Explanation: Display the different permissions supported by the server
show create database database_name;
Explanation: Display the SQL statement to create the specified database
show create table table_name;
Explanation: Display the SQL statement to create the specified data table
show innodb status;
Explanation: Displays the status of the innoDB storage engine
show logs;
Explanation: Display the logs of the BDB storage engine
show warnings;
Explanation: Displays errors, warnings, and notifications from the last executed statement
show errors;
Explanation: Display only the errors generated by the last executed statement
SELECT now(),version();