Größe einer DB, Tabelle, aller DBs herausfinden

Ersetze 'YOUR_DATABASE_NAME' durch die gewünschte Datenbank.

Größe aller Tabellen einer Datenbank:

SELECT TABLE_SCHEMA AS 'Database_name', TABLE_NAME AS 'Table_Name',CONCAT(ROUND(((DATA_LENGTH + INDEX_LENGTH - DATA_FREE) / 1024 / 1024),2)," Mb") AS Size FROM INFORMATION_SCHEMA.TABLES;

Größe bestimmter Tabellen:

SELECT TABLE_SCHEMA AS 'Database_name', TABLE_NAME AS 'Table_Name',CONCAT(ROUND(((DATA_LENGTH + INDEX_LENGTH - DATA_FREE) / 1024 / 1024),2)," MB") AS Size FROM INFORMATION_SCHEMA.TABLES where TABLE_SCHEMA = 'YOUR_DATABASE_NAME';

Größe einer bestimmten Datenbank:

SELECT CONCAT(sum(ROUND(((DATA_LENGTH + INDEX_LENGTH - DATA_FREE) / 1024 / 1024),2))," MB") AS Size FROM INFORMATION_SCHEMA.TABLES where TABLE_SCHEMA =  'YOUR_DATABASE_NAME';

Größe aller Datenbanken:

SELECT table_schema AS "Database", sum( data_length + index_length ) / 1024 / 1024 AS "Size in MB" FROM information_schema.TABLES GROUP BY table_schema;

Größe aller Datenbanken und wieviel Platz durch ein "OPTIMIZE TABLE" gewonnen werden kann:

SELECT table_schema "database name", round( sum( data_length + index_length ) / 1024 / 1024) "database size in MB", round( sum( data_free )/ 1024 / 1024) "free space in MB" FROM information_schema.TABLES GROUP BY table_schema;