Connecting to mysql
You can try either of the following commands to connect to mysql:
root@ubuntu:~# mysql -p
Enter password:
or
root@ubuntu:~# mysql -u -p
or
root@ubuntu:~# mysql --password=P@ssw0rd
or
root@ubuntu:~# mysql --user=root --password=P@ssw0rd
Listing databases
See what happens if you login with no user and no password:
root@ubuntu:~# mysql -u -p
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 85
Server version: 5.5.31-0ubuntu0.13.04.1 (Ubuntu)
Copyright (c) 2000, 2013, 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 |
| test |
+--------------------+
2 rows in set (0.00 sec)
mysql> use cacti
ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'cacti'
Now let’s try to login with root user and check if we see DBs that belong to the user:
mysql> exit
Bye
root@ubuntu:~# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 87
Server version: 5.5.31-0ubuntu0.13.04.1 (Ubuntu)
Copyright (c) 2000, 2013, 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 |
| cacti |
| mysql |
| performance_schema |
| test |
+--------------------+
5 rows in set (0.00 sec)
mysql>
Lising tables
To find out which database is currently selected, use the DATABASE() function:
mysql> select database ();
+-------------+
| database () |
+-------------+
| NULL |
+-------------+
1 row in set (0.00 sec)
mysql> show tables;
ERROR 1046 (3D000): No database selected
As you can see no database was selected. To select a database use use
command:
mysql> use cacti;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed[code]
Confirm that the database was selected:
[code]mysql> select database ();
+-------------+
| database () |
+-------------+
| cacti |
+-------------+
1 row in set (0.00 sec)
Show tables inside the database:
mysql> show tables;
+---------------------------+
| Tables_in_cacti |
+---------------------------+
| cdef |
| cdef_items |
| colors |
| data_input |
| data_input_data |
| data_input_fields |
| data_local |
| data_template |
| data_template_data |
| data_template_data_rra |
| data_template_rrd |
| graph_local |
| graph_template_input |
| graph_template_input_defs |
| graph_templates |
| graph_templates_gprint |
| graph_templates_graph |
| graph_templates_item |
| graph_tree |
| graph_tree_items |
| host |
| host_graph |
| host_snmp_cache |
| host_snmp_query |
| host_template |
| host_template_graph |
| host_template_snmp_query |
| plugin_config |
| plugin_db_changes |
| plugin_hooks |
| plugin_realms |
| poller |
| poller_command |
| poller_item |
| poller_output |
| poller_reindex |
| poller_time |
| rra |
| rra_cf |
| settings |
| settings_graphs |
| settings_tree |
| snmp_query |
| snmp_query_graph |
| snmp_query_graph_rrd |
| snmp_query_graph_rrd_sv |
| snmp_query_graph_sv |
| user_auth |
| user_auth_perms |
| user_auth_realm |
| user_log |
| version |
+---------------------------+
52 rows in set (0.00 sec)
mysql>
