Ruby On Rails session storage problem

Im creating a sample RUBY ON RAILS APP and storing sessions in DB

The table structure is id:pk,autoincrement

session_id:varchar 256

data:longtext

When i click save i get following error:

"Your session data is larger than the data column in which it is to be stored. You must increase th开发者_运维百科e size of your data column if you intend to store large data."

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Your question itself has the answer. Just increase the size of data:longtext which is data column