Difference between revisions of "Useful MySQL Commands"
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This is an article dedicated to useful SQL commands to run in PHPmyAdmin or via Heidi/SQLYog. They serve various purposes and hopefully come in handy. | This is an article dedicated to useful SQL commands to run in PHPmyAdmin or via Heidi/SQLYog. They serve various purposes and hopefully come in handy. | ||
| + | |||
| + | == Get Total DB Size == | ||
| + | Use this query as is in PHPmyAdmin to get a total size of all databases accessible. | ||
| + | |||
| + | <syntaxhighlight lang="mysql" enclose="div"> | ||
| + | SELECT table_schema "DB Name", | ||
| + | Round(Sum(data_length + index_length) / 1024 / 1024, 1) "DB Size in MB" | ||
| + | FROM information_schema.tables | ||
| + | GROUP BY table_schema; | ||
| + | </syntaxhighlight> | ||
== Display Table Names Sorted by Size == | == Display Table Names Sorted by Size == | ||
| − | Remember to replace DATABASENAME with the name of the database. | + | Remember to replace DATABASENAME with the name of the database. This will return a list of all tables in the database sorted from largest use to smallest in MB. |
<syntaxhighlight lang="mysql" enclose="div"> | <syntaxhighlight lang="mysql" enclose="div"> | ||
Latest revision as of 16:29, 30 April 2018
This is an article dedicated to useful SQL commands to run in PHPmyAdmin or via Heidi/SQLYog. They serve various purposes and hopefully come in handy.
Get Total DB Size
Use this query as is in PHPmyAdmin to get a total size of all databases accessible.
SELECT table_schema "DB Name",
Round(Sum(data_length + index_length) / 1024 / 1024, 1) "DB Size in MB"
FROM information_schema.tables
GROUP BY table_schema;
Display Table Names Sorted by Size
Remember to replace DATABASENAME with the name of the database. This will return a list of all tables in the database sorted from largest use to smallest in MB.
SELECT table_name AS "Table",
ROUND(((data_length + index_length) / 1024 / 1024), 2) AS "Size (MB)"
FROM information_schema.TABLES
WHERE table_schema = "DATABASENAME"
ORDER BY (data_length + index_length) DESC;
