How to disable MySQL from autostart when Ubuntu bootup
Answer:
A newer version of MySQL use upstart to autostart when system bootup, to disable it
# sudo mkdir /etc/init.disabled # sudo mv /etc/init/mysql.conf /etc/init.disabled/
May 182013
Sep 242011
Show the current privileges of a MySQL user
Answer:
To show the current privileges of a MySQL user, you can use the SHOW GRANTS statement
E.g.
mysql> SHOW GRANTS;
+----------------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost |
+----------------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '*****************************************' WITH GRANT OPTION |
+----------------------------------------------------------------------------------------------------------------------------------------+Sep 162011
Show the current user in MySQL
Answer:
Like in the shell, we can execute the command whoami to find out the current user name, we can use the function CURRENT_USER();
E.g.
mysql> SELECT CURRENT_USER();
+----------------+
| CURRENT_USER() |
+----------------+
| root@localhost |
+----------------+
1 row in set (0.00 sec)Aug 252011
Disable MySQL server from listening for TCP/IP connections
Answer:
If you only connect to the MySQL server from localhost and you might want to disable TCP/IP networking feature so the server is more secure.
To do so, edit the MySQL configurations, e.g. /etc/my.cnf
..
skip-networking
..Don't forget to restart MySQL to take effect.
# /sbin/service mysqld restart
Aug 112011
Show the storage used by a database in MySQL
Answer:
In previous article, we have already discussed how to list the database size in your MySQL server.
But if you want to have a more detail view on an individual database, you can try the following (crazy) SQL.
SELECT s.schema_name,
CONCAT(IFNULL(ROUND((SUM(t.data_length)+SUM(t.index_length))
/1024/1024,2),0.00),"Mb") total_size,
CONCAT(IFNULL(ROUND(((SUM(t.data_length)+SUM(t.index_length))-SUM(t.data_free))/1024/1024,2),0.00),"Mb")
data_used,
CONCAT(IFNULL(ROUND(SUM(data_free)/1024/1024,2),0.00),"Mb") data_free,
IFNULL(ROUND((((SUM(t.data_length)+SUM(t.index_length))-SUM(t.data_free))
/((SUM(t.data_length)+SUM(t.index_length)))*100),2),0) pct_used,
COUNT(table_name) total_tables
FROM INFORMATION_SCHEMA.SCHEMATA s
LEFT JOIN INFORMATION_SCHEMA.TABLES t ON s.schema_name = t.table_schema
WHERE s.schema_name = "mydatabase"
GROUP BY s.schema_name
ORDER BY pct_used DESC\GIt will give you something like the following..
schema_name: mydatabase
total_size: 165.09Mb
data_used: 12.09Mb
data_free: 153.00Mb
pct_used: 7.33
total_tables: 133