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My application requires to keep large data objects in session. There are like 3-4 data objects each created by parsing a csv containing 150 X 20 cells having strings of 3-4 characters. My application shows this error- "marshal data too short". I tried this- Deleting the old session table. Deleting the old migration for session table. Creating a new migration using rake db:sessions:create . editing the migration manually, changing text: data to longtext: data . running the migration using rake db:migrate . other details of application-- In view "index.html.erb"- There is a link that makes ajax call to an action in controller, that action parses large csv file and makes an object out of it. this object is stored in session. ERROR LOG ` ArgumentError in Scoring#index Showing app/views/scoring/index.html.erb where line #4 raised: marshal data too short Extracted source (around line #4): 1: 2: <form id="myForm"> 3: 4: <%= link_to_remote "get csv file", 5: :url => { :action => 'show_static_1' }, 6: :update => "static_score", 7: :complete => "$('static_score').update(request.responseText)" %> Application Trace | Framework Trace | Full Trace /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/session_store.rb:71:in `load' /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/session_store.rb:71:in `unmarshal' /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/session_store.rb:110:in `data' /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/session_store.rb:292:in `get_session' /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:1448:in `silence' /usr/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/session_store.rb:288:in `get_session' /usr/lib/ruby/gems/1.8/gems/actionpack-2.3

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