SQL execution time in Rake tasks - ruby-on-rails

Question

I've various rake tasks inside my rails app. One simple example is shown below.
desc "Simple rake task"
task :test_rake do |task|
first_sql_query = FirstModel.find(10)
SecondModel.create(:name => 'Test 101', :email => 'abc#def.co')
final_query = SecondModel.find(900)
end
Now in the above rake task, we're making three database calls with each of them taking x, y, z seconds supposedly.
Is there any way to find out the total time spent on db operations(x+y+z secs) for a given rake task..??

Answer 1

Use benchmark
task :test_rake do |task|
time = Benchmark.realtime {
first_sql_query = FirstModel.find(10)
SecondModel.create(:name => 'Test 101', :email => 'abc#def.co')
final_query = SecondModel.find(900)
}
puts time
end
getting separate benchmarks:
puts Benchmark.measure { FirstModel.find(10) }
puts Benchmark.measure { SecondModel.create(:name => 'Test 101', :email => 'abc#def.co') }
puts Benchmark.measure { final_query = SecondModel.find(900) }

Answer 2

Query timing is included in the log file:
❯❯❯ rake db:migrate:status
database: ml_development
Status Migration ID Migration Name
--------------------------------------------------
up 20180612055823 ********** NO FILE **********
then:
❯❯❯ cat log/development.log
[DEBUG] (0.4ms) SELECT "schema_migrations"."version" FROM "schema_migrations" ORDER BY "schema_migrations"."version" ASC
```

Answer 3

#pattu Rails internally use Benchmark for execution time check say_with_time
You can add the same function in a module and include in the rack task to find the execution time of SQL queries.
These Two functions are needed:
def say(message, subitem = false)
puts "#{subitem ? " ->" : "--"} #{message}"
end
def say_with_time(message = "")
say(message)
result = nil
time = Benchmark.measure { result = yield }
say "%.4fs" % time.real, :subitem
say("#{result} rows", :subitem) if result.is_a?(Integer)
result
end
Use this in Your rake task as
desc "Simple rake task"
task :test_rake do |task|
say_with_time do
first_sql_query = FirstModel.find(10)
SecondModel.create(:name => 'Test 101', :email => 'abc#def.co')
final_query = SecondModel.find(900)
end
end