View table information: show table status like tableName \G
row_format: row format
rows: the number of rows in the table
avg_row_length: the average number of bytes included in each row
data_length: The amount of data in the entire table
max_data_length: The maximum amount of data the table can hold
index_length: The size of the space occupied by the index data
Engines supported by MySQL
Image credit: High Performance MySQL Version 2.
MyISAM engine
MySQL's default storage engine does not support transactions and row-level searches.
.frm: Definition of storage table in file
.MYD: data file
.MYI: index file
InnoDB engine