information_schema.tables.data_length

Note:

For InnoDB/XtraDB, the index size, in pages, multiplied by the page size. For Aria and MyISAM, length of the data file, in bytes. For MEMORY, the approximate allocated memory.

Note:

Data length. DATA_LENGTH = TABLE_ROWS * the sum of storage lengths of the columns in the tuple. The replicas of TiKV are not taken into account.