![]() ![]() We can even get a bit fancier and convert the normal size values from bytes into something more useful and understandable to most people like megabytes. INDEX_LENGTH is the length (or size) of the index file for the table (also in bytes).Īrmed with this information, we can execute a query that will list all tables in a specific database along with the disk space (size) of each.DATA_LENGTH is the length (or size) of all data in the table (in bytes).List Table Sizes From a Single DatabaseĪs can seen in the official documentation, the INFORMATION_SCHEMA.TABLES table contains around 20 columns, but for the purpose of determining the amount of disk space used by tables, we’ll focus on two columns in particular: DATA_LENGTH and INDEX_LENGTH. For our purposes we’re particularly interested in the tables metadata, which we can query to actually extract the size of various tables in the system. Everything from views and user_privilieges to columns and tables can be found in the INFORMATION_SCHEMA. To find the size of each user-created database, run the following query: mysql> SELECT tableschema, ROUND(SUM(datalength+indexlength)/1024/1024/1024,2) size. See SHOW Statements, or myisamchk MyISAM Table-Maintenance Utility. If you haven’t set a password for your MySQL user you can omit the -p. You can check the maximum data and index sizes by using this statement: SHOW TABLE STATUS FROM dbname LIKE tblname You also can use myisamchk -dv /path/to/table-index-file. Access the MySQL server using the following command and enter your MySQL user password when prompted: mysql -u user -p. ![]() Regardless of the name, what matters is the information provided by these INFORMATION_SCHEMA tables. The most common way to get a list of the MySQL databases is by using the mysql client to connect to the MySQL server and run the SHOW DATABASES command. While most other databases refer to this information as a catalog, the official MySQL documentation refers to the INFORMATION_SCHEMA metadata as tables. Like most relational databases, MySQL provides useful metadata about the database itself.
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