Is it possible to remove the prompt history on MariaDB?

Question

The main problem is that I wrote a security sensitive statement on MariaDB (among many other statements), so I would like to remove the prompt history (like the command history -c on Linux):

jordiba90@lts:~$ sudo mariadb -u root -p
[sudo] contraseña para jordiba90: 
Enter password: 
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 36
Server version: 10.3.25-MariaDB-0ubuntu0.20.04.1 Ubuntu 20.04
Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> USE mysql;
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
    
MariaDB [mysql]> UPDATE user SET password=PASSWORD("PASSWORD") WHERE user="root";
Query OK, 0 rows affected (0.001 sec)
Rows matched: 1 Changed: 0 Warnings: 0

MariaDB [mysql]> FLUSH privileges;
Query OK, 0 rows affected (0.001 sec)

So, when I click the up&down buttons on my keyboard I see all the prompt history .

When I try to remove the prompt history on MariaDB, it does not work:

MariaDB [(none)]> clear

MariaDB [(none)]> \c

MariaDB [(none)]> quit
Bye

So, I have checked on the inte.net this script ( that does not work either ):

jordiba90@lts:~$ rm ~/.mysql_history

jordiba90@lts:~$ export MYSQL_HISTFILE=/dev/null

jordiba90@lts:~$ set | grep MYSQ
MYSQL_HISTFILE=/dev/null
_=MYSQL_HISTFILE=/dev/null

REFERENCE > https://www.thegeekstuff.com/2010/01/disable-mysql-history-clear-mysql_history-and-mysql_histfile/

After that, I have also checked on the inte.net another script ( that does not work either, again ):

jordiba90@lts:~$ ~/.mysql_history
bash: /home/jordiba90/.mysql_history: No existe el archivo o el directorio

jordiba90@lts:~$ rm $HOME/.mysql_history
rm: no se puede borrar '/home/jordiba90/.mysql_history': No existe el archivo o el directorio

jordiba90@lts:~$ ln -s /dev/null $HOME/.mysql_history

REFERENCE > https://www.cyberciti.biz/faq/howto-clear-mysql-command-history/

One the one hand, there are too many files on my OS related to "mysql" but none related to mysql history, so I have checked one by one all the files related to mysql configuration and I did not find the one I should remove:

jordiba90@lts:~$ locate mysql | wc
    421     421   25918

jordiba90@lts:~$ locate mysql | grep history

jordiba90@lts:~$ locate mysql | grep conf
/etc/mysql/conf.d
/etc/mysql/conf.d/mysql.cnf
/etc/mysql/conf.d/mysqldump.cnf
/etc/mysql/mariadb.conf.d
/etc/mysql/mariadb.conf.d/50-client.cnf
/etc/mysql/mariadb.conf.d/50-mysql-clients.cnf
/etc/mysql/mariadb.conf.d/50-mysqld_safe.cnf
/etc/mysql/mariadb.conf.d/50-server.cnf
/usr/share/mysql-common/configure-symlinks
/usr/share/mysql/systemd/use_galera_new_cluster.conf
/var/lib/dpkg/info/mysql-common.conffiles

One the other hand, the same happens with the mariadb files:

jordiba90@lts:~$ locate mariadb | wc
    101     101    5042

jordiba90@lts:~$ locate mariadb | grep history

jordiba90@lts:~$ locate mariadb | grep conf
/etc/insserv.conf.d/mariadb
/etc/mysql/mariadb.conf.d
/etc/mysql/mariadb.conf.d/50-client.cnf
/etc/mysql/mariadb.conf.d/50-mysql-clients.cnf
/etc/mysql/mariadb.conf.d/50-mysqld_safe.cnf
/etc/mysql/mariadb.conf.d/50-server.cnf
/usr/lib/systemd/system/mariadb@bootstrap.service.d/use_galera_new_cluster.conf
/var/lib/dpkg/info/mariadb-client-10.3.conffiles
/var/lib/dpkg/info/mariadb-common.conffiles
/var/lib/dpkg/info/mariadb-server-10.3.conffiles
/var/lib/dpkg/info/mariadb-server-10.3.config

Could you please give me a hint? You can check that I have tried it. Thanks in advance.

PS_1: if there is any other entry about this topic on Stack* (I have checked it and I did not see one) or if my entry breaks any rule on Stack* (I have checked the rules and I think I do not break any), please send me a PM and I will delete this entry. I am trying to learn without losing reputation points for asking a question.

PS_2: I have restarted mysql and right now the status is active (running):

jordiba90@lts:~$ sudo /etc/init.d/mysql restart
Restarting mysql (via systemctl): mysql.service.

jordiba90@lts:~$ sudo /etc/init.d/mysql status
● mariadb.service - MariaDB 10.3.25 database server
     Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset: enabled)
     Active: active (running) since Sat 2020-11-14 13:24:47 CET; 8h ago
       Docs: man:mysqld(8)
             https://mariadb.com/kb/en/library/systemd/
    Process: 826 ExecStartPre=/usr/bin/install -m 755 -o mysql -g root -d /var/run/mysqld (code=exited, status=0/SUCCESS)
    Process: 861 ExecStartPre=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
    Process: 876 ExecStartPre=/bin/sh -c [ ! -e /usr/bin/galera_recovery ] && VAR= ||   VAR=`cd /usr/bin/..; /usr/bin/galera_recovery`; [ $? -eq 0 ]   && systemctl set-environment _WSREP_START_POSITION=$VAR || exit 1 (code=exited, status=0/SUCCESS)
    Process: 1026 ExecStartPost=/bin/sh -c systemctl unset-environment _WSREP_START_POSITION (code=exited, status=0/SUCCESS)
    Process: 1028 ExecStartPost=/etc/mysql/debian-start (code=exited, status=0/SUCCESS)
   Main PID: 957 (mysqld)
     Status: "Taking your SQL requests now..."
      Tasks: 31 (limit: 9423)
     Memory: 93.1M
     CGroup: /system.slice/mariadb.service
             └─957 /usr/sbin/mysqld

nov 14 13:24:46 lts systemd[1]: Starting MariaDB 10.3.25 database server...
nov 14 13:24:47 lts mysqld[957]: 2020-11-14 13:24:47 0 [Note] /usr/sbin/mysqld (mysqld 10.3.25-MariaDB-0ubuntu0.20.04.1) starting as…ess 957 ...
nov 14 13:24:47 lts mysqld[957]: 2020-11-14 13:24:47 0 [Warning] Could not increase number of max_open_files to more than 16384 (request: 32186)
nov 14 13:24:47 lts systemd[1]: Started MariaDB 10.3.25 database server.
nov 14 13:24:47 lts /etc/mysql/debian-start[1030]: Upgrading MySQL tables if necessary.
nov 14 13:24:47 lts /etc/mysql/debian-start[1033]: Looking for 'mysql' as: /usr/bin/mysql
nov 14 13:24:47 lts /etc/mysql/debian-start[1033]: Looking for 'mysqlcheck' as: /usr/bin/mysqlcheck
nov 14 13:24:47 lts /etc/mysql/debian-start[1033]: This installation of MySQL is already upgraded to 10.3.25-MariaDB, use --force if y…l_upgrade
Hint: Some lines were ellipsized, use -l to show in full.

REFERENCE > https://superuser.com/questions/282115/how-to-restart-mysql

PS_3: I have tried the command stat ~/.mysql_history; rm ~/.mysql_history; stat ~/.mysql_history stat ~/.mysql_history; rm ~/.mysql_history; stat ~/.mysql_history stat ~/.mysql_history; rm ~/.mysql_history; stat ~/.mysql_history and the output that I have is that the file or the directory /home/jordiba90/.mysql_history does not exist

PS_4: I have tried the command strace mysql and I can not share here the output because there is a message body limit to 30.000 characters (and if I do that, I should have entered 44.321, aprox)

PS_5: Having checked the specific output openat(AT_FDCWD... , there is none related to mysql_history . It does not appear that specific sentence

PS_6: I have used 'sudo' to try the command 'strace mysql'and I have got the following output related to mysql history:

openat(AT_FDCWD, "/root/.mysql_history", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0600, st_size=4585, ...}) = 0
read(4, "misql -u root -p\nDatascience2005"..., 4585) = 4585
close(4)                                = 0
write(1, "\33(B\33[m\33(B\33[0;1mType 'help;' or '"..., 94Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
) = 94
write(1, "\n", 1
) 

PS_7: I have removed the last directory related to mysql history named /root/.mysql_history but I still see the history on the mariadb prompt

Answer 1

Editing the history file (for example with vim, and deleting the problematic lines) worked in my case:

vim ~/.mysql_history

(mysql Ver 15.1 Distrib 10.4.14-MariaDB)