Wiki page mariadb changed with summary [] by Daniel
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@ -31,3 +31,174 @@ Set the password for the mysql root user, and most questions can be answered yes
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<code>
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mysql_secure_installation
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</code>
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===== Create local user =====
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<code>
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mysql -u root -p
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</code>
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<code>
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CREATE USER 'user_name'@'localhost' IDENTIFIED BY 'mypassword';
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FLUSH PRIVILEGES;
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EXIT;
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</code>
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===== Create remote user =====
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<code>
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mysql -u root -p
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</code>
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<code>
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CREATE USER 'user_name'@'%' IDENTIFIED BY 'mypassword';
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FLUSH PRIVILEGES;
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EXIT;
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</code>
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===== Create database =====
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<code>
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mysql -u root -p
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</code>
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<code>
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CREATE DATABASE db_name;
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GRANT ALL ON db_name.* to 'user_name'@'localhost' IDENTIFIED BY 'password' WITH GRANT OPTION;
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FLUSH PRIVILEGES;
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\q
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</code>
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or something more detailed
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<code>
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GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, INDEX, DROP, ALTER, CREATE TEMPORARY TABLES, LOCK TABLES ON db_name_here.* TO 'myuser'@'localhost';
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</code>
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===== Show and delete database =====
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<code>
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mysql -u root -p
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SHOW DATABASES;
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DROP DATABASE db_name;
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FLUSH PRIVILEGES;
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EXIT;
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</code>
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===== Show and delete user =====
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<code>
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mysql -u root -p
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SELECT User FROM mysql.user;
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DROP USER user_name@localhost;
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FLUSH PRIVILEGES;
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EXIT;
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</code>
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===== Set or change password =====
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<code>
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SET PASSWORD FOR 'user_name'@'localhost' = PASSWORD('password');
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FLUSH PRIVILEGES;
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EXIT;
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</code>
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===== Backup database =====
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You can dump all databases just with this command ''mysqldump --single-transaction --flush-logs --master-data=2 --all-databases -u root -p | gzip > all_databases.sql.gz
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'' or use the script below.
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<code>
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#!/bin/bash
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# Shell script to backup MySQL database
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# Set these variables
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MyUSER="my_user" # DB_USERNAME
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MyPASS="mypassword" # DB_PASSWORD
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MyHOST="localhost" # DB_HOSTNAME
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# Backup Dest directory
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DEST="/path/to/backup/mysql/"
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# Email for notifications
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# EMAIL="email"
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# How many days old files must be to be removed
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DAYS="60"
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# Linux bin paths
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MYSQL="$(which mysql)"
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MYSQLDUMP="$(which mysqldump)"
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GZIP="$(which gzip)"
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# Get date in dd-mm-yyyy format
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NOW="$(date +"%d-%m-%Y_%H-%M")"
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# Create Backup sub-directories
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MBD="$DEST/$NOW/mysql"
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install -d $MBD
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# DB skip list
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SKIP="information_schema
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performance_schema"
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# Get all databases
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DBS="$($MYSQL -h $MyHOST -u $MyUSER -p$MyPASS -Bse 'show databases')"
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# Archive database dumps
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for db in $DBS
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do
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skipdb=-1
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if [ "$SKIP" != "" ];
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then
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for i in $SKIP
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do
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[ "$db" == "$i" ] && skipdb=1 || :
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done
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fi
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if [ "$skipdb" == "-1" ] ; then
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FILE="$MBD/$db.sql"
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$MYSQLDUMP -h $MyHOST -u $MyUSER -p$MyPASS $db > $FILE
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fi
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done
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# Archive the directory, send mail and cleanup
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cd $DEST
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tar -cf $NOW.tar $NOW
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$GZIP -9 $NOW.tar
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#echo -e "Subject: MySQL backup $(hostname)\r\n\r\nMySQL backup is completed! Backup name is $NOW.tar.gz" | msmtp -a default $EMAIL
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rm -rf $NOW
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# Remove old files
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find $DEST -mtime +$DAYS -exec rm -f {} \;
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</code>
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===== Restore database =====
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<code>
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mysql -u root -p db_name < database.sql
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</code>
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===== Check/update database =====
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Upon a major version release of mariadb (for example mariadb-10.7.4-1 to mariadb-10.8.3-1), it is wise to upgrade databases:
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- keep the 10.7.4-1 database daemon running
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- upgrade the package
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- run mysql_upgrade (from the new package version) against the old still-running daemon. This will produce some error messages; however, the upgrade will succeed.
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- restart the daemon, so the 10.8.3 daemon runs.
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<code>
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mysql_upgrade -u root -p
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</code>
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To check all tables in all databases:
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<code>
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mysqlcheck --all-databases -u root -p -c
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</code>
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To analyze all tables in all databases:
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<code>
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mysqlcheck --all-databases -u root -p -a
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</code>
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To repair all tables in all databases:
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`mysqlcheck --all-databases -u root -p -r`
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To optimize all tables in all databases:
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`mysqlcheck --all-databases -u root -p -o`
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