Mysql::Error: MySQL server has gone away

Rails
1

Hello everyone,

I am trying to create reports and the batch has 750 students. with i
trying
to create report for that batch i am getting this error in my production
.
How to solve this thing. kindly help me thanks in advance.

ActiveRecord::StatementInvalid (Mysql::Error: MySQL server has gone
away:
SELECT * FROM exam_reports WHERE (exam_reports.student_id = 130)
LIMIT 1):
app/models/exam_report.rb:67:in generate_normal_report' app/models/exam_report.rb:15:ineach’
app/models/exam_report.rb:15:in generate_normal_report' app/models/exam_report.rb:7:ineach’
app/models/exam_report.rb:7:in generate_normal_report' app/controllers/exam_reports_controller.rb:77:innormal_report_generation’
passenger (3.0.9) lib/phusion_passenger/rack/request_handler.rb:96:in
process_request' passenger (3.0.9) lib/phusion_passenger/abstract_request_handler.rb:513:inaccept_and_process_next_request’
passenger (3.0.9)
lib/phusion_passenger/abstract_request_handler.rb:274:in main_loop' passenger (3.0.9) lib/phusion_passenger/classic_rails/application_spawner.rb:321:instart_request_handler’
passenger (3.0.9)
lib/phusion_passenger/classic_rails/application_spawner.rb:275:in send' passenger (3.0.9) lib/phusion_passenger/classic_rails/application_spawner.rb:275:inhandle_spawn_application’
passenger (3.0.9) lib/phusion_passenger/utils.rb:479:in safe_fork' passenger (3.0.9) lib/phusion_passenger/classic_rails/application_spawner.rb:270:inhandle_spawn_application’
passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:357:in
__send__' passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:357:inserver_main_loop’
passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:206:in
start_synchronously' passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:180:instart’
passenger (3.0.9)
lib/phusion_passenger/classic_rails/application_spawner.rb:149:in
start' passenger (3.0.9) lib/phusion_passenger/spawn_manager.rb:219:inspawn_rails_application’
passenger (3.0.9)
lib/phusion_passenger/abstract_server_collection.rb:132:in
lookup_or_add' passenger (3.0.9) lib/phusion_passenger/spawn_manager.rb:214:inspawn_rails_application’
passenger (3.0.9)
lib/phusion_passenger/abstract_server_collection.rb:82:in synchronize' passenger (3.0.9) lib/phusion_passenger/abstract_server_collection.rb:79:insynchronize’
passenger (3.0.9) lib/phusion_passenger/spawn_manager.rb:213:in
spawn_rails_application' passenger (3.0.9) lib/phusion_passenger/spawn_manager.rb:132:inspawn_application’
passenger (3.0.9) lib/phusion_passenger/spawn_manager.rb:275:in
handle_spawn_application' passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:357:insend’
passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:357:in
server_main_loop' passenger (3.0.9) lib/phusion_passenger/abstract_server.rb:206:instart_synchronously’
passenger (3.0.9) helper-scripts/passenger-spawn-server:99

2

On 3 April 2013 10:31, keerthi priya [email protected]
wrote:

Hello everyone,

I am trying to create reports and the batch has 750 students. with i trying
to create report for that batch i am getting this error in my production .
How to solve this thing. kindly help me thanks in advance.

ActiveRecord::StatementInvalid (Mysql::Error: MySQL server has gone away:

If no-one comes up with anything more useful then googling for
rails Mysql::Error: MySQL server has gone away
yields numerous hits that may be helpful, starting with [1].

Colin

[1]