How to time out a query

Rails
#1

Hi,

I’ve got an activerecord query which takes longer than 100 seconds. I’m
using rails 2.2 with postgresql 8.3.
http://www.postgresql.org/docs/8.3/static/runtime-config-client.html
mentions an option called “statement_timeout” which when set aborts a
query which takes longer than x milli seconds.

How do I pass this option to AR so that it in turn passes this to
postgresql?

cheers,
skar.

–

The life so short, the craft so long to learn.

#2

You’ve probably already figured it out, but this looks workable:

See this page for some of the statement-related settings:

http://www.postgresql.org/docs/8.3/static/runtime-config-client.html
def setStatementTimeout milliseconds
query = “SET statement_timeout = #{milliseconds};”
ActiveRecord::Base.connection().execute query
end

#3

Another alternative would be to just wrap your long-running query in a
timeout, something like:

require ‘timeout’
…
begin
status = Timeout::timeout(60) do
# some long-running action …
end
rescue Timeout::Error => te

…

end

Jeff