Am 04.01.2018 um 17:56 schrieb Guillaume Lefranc:
it might be because of socket authentication plugin:

https://mariadb.com/kb/en/library/authentication-plugin-unix-socket/

In other words if you use "root" unix account you don't need password.

then he would have seen the "mysql" database in "show databases"

Le jeu. 4 janv. 2018 à 09:20, Karthick Subramanian <ksubraman...@paycommerce.com <mailto:ksubraman...@paycommerce.com>> a écrit :

    Thank you.

    I noticed some anonymous user entries in mysql.user. I have executed
    the mysql_secure_installation and removed those users as well.

    On Thu, Jan 4, 2018 at 1:03 PM, Federico Razzoli
    <federico_...@yahoo.it <mailto:federico_...@yahoo.it>> wrote:

        Check table mysql.user: you probably have the account
        '%'@localhost. It's a pattern, and rot@localhost matches.
        When running SHOW DATABASES you see only the databases which you
        have some permissions.

        Federico



        ------------------------------------------------------------------------
        *Da:* Karthick Subramanian <ksubraman...@paycommerce.com
        <mailto:ksubraman...@paycommerce.com>>
        *A:* Maria Discuss <maria-discuss@lists.launchpad.net
        <mailto:maria-discuss@lists.launchpad.net>>
        *Inviato:* Giovedì 4 Gennaio 2018 6:01
        *Oggetto:* [Maria-discuss] Is this normal behaviour?

        All,

        When I tried to connect in centos 7 mariadb 10.2.11 server using
        root user, by mistake I gave wrong user name, but it connected
        successfully. I am not sure why. When I check show databases, it
        didnt list all DBs, but when I connect with root again, I can
        see all valid Dbs.

        Is this normal that even if I give wrong user, it authenticate
        into DB server from root.

        [root@ipaddr ~]# mysql -u rot
        Welcome to the MariaDB monitor.  Commands end with ; or \g.
        Your MariaDB connection id is 22
        Server version: 10.2.11-MariaDB MariaDB Server

        Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

        Type 'help;' or '\h' for help. Type '\c' to clear the current
        input statement.

        MariaDB [(none)]> show databases;
        +--------------------+
        | Database           |
        +--------------------+
        | information_schema |
        | test               |
        +--------------------+
        2 rows in set (0.00 sec)

        MariaDB [(none)]> exit
        Bye
        [root@ipaddr~]# mysql -u root
        Welcome to the MariaDB monitor.  Commands end with ; or \g.
        Your MariaDB connection id is 24
        Server version: 10.2.11-MariaDB MariaDB Server

        Copyright (c) 2000, 2017, Oracle, MariaDB Corporation Ab and others.

        Type 'help;' or '\h' for help. Type '\c' to clear the current
        input statement.

        MariaDB [(none)]> show databases;
        +--------------------+
        | Database           |
        +--------------------+
        | mydb01     |
        | information_schema |
        | mydb02      |
        | mysql              |
        | performance_schema |
        | test               |
        +--------------------+
        6 rows in set (0.00 sec)

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