LONGBLOB

A BLOB column with a maximum length of 4,294,967,295 or 4GB (232 - 1)
bytes. The maximum effective (permitted) length of LONGBLOB columns
depends on the configured maximum packet size in the client/server
protocol and available memory.

URL: http://dev.mysql.com/doc/refman/5.0/en/string-type-overview.html

