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Show the size of all databases in MB

harmless rootMySQL and MariaDBdebian, ubuntu
root@server
mysql -e 'SELECT table_schema AS db, ROUND(SUM(data_length + index_length) / 1024 / 1024, 1) AS mb FROM information_schema.tables GROUP BY table_schema ORDER BY mb DESC;'

Sums up the size of data and indexes per database from information_schema and sorts in descending order. Quickly shows which website or application uses the most database space. The values are InnoDB estimates and may differ from the space used on disk.

Note: On Plesk servers, run it via plesk db or as admin.

Also searched as

  • which database is the largest
  • show mysql database size
  • database disk usage

Related one-liners

All in MySQL and MariaDB

Find the 20 largest tables on the server

#mysql -e 'SELECT table_schema, table_name, ROUND((data_length + index_length) / 1024 / 1024, 1) AS mb, table_rows FROM information_schema.tables ORDER BY data_length + index_length DESC LIMIT 20;'
harmlessMySQL and MariaDB

Analyze the slow query log for the slowest queries

#mysqldumpslow -s t -t 10 /var/log/mysql/mariadb-slow.log
harmlessMySQL and MariaDB

Back up a single database consistently as gzip

$mysqldump --single-transaction --quick -u dbuser -p wp_example | gzip > /var/www/vhosts/example.com/wp_example.sql.gz
harmlessMySQL and MariaDB

Back up all databases into one gzipped file

#mysqldump --single-transaction --quick --all-databases --routines --events | gzip > /root/all-databases.sql.gz
harmlessMySQL and MariaDB

Back up each database into its own gzipped file

#for db in $(mysql -NBe 'SHOW DATABASES' | grep -Ev '^(information_schema|performance_schema|sys)$'); do mysqldump --single-transaction --quick "$db" | gzip > "/root/db-backup/$db.sql.gz"; done
harmlessMySQL and MariaDB

Check all MySQL tables for errors

#mysqlcheck --all-databases --check --silent
harmlessMySQL and MariaDB

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