From 29d564add926307fea8cd3f77caf88d735e252a1 Mon Sep 17 00:00:00 2001 From: Xavier Noria Date: Mon, 26 Nov 2012 07:43:43 -0800 Subject: Merge pull request #6197 from blakesmith/connection_adapters_without_explain_support Don't run explain on slow queries for database adapters that don't support it --- activerecord/lib/active_record/explain.rb | 13 +++++++------ activerecord/lib/active_record/railtie.rb | 7 +++++++ 2 files changed, 14 insertions(+), 6 deletions(-) (limited to 'activerecord/lib') diff --git a/activerecord/lib/active_record/explain.rb b/activerecord/lib/active_record/explain.rb index bdccf535ea..236834fd84 100644 --- a/activerecord/lib/active_record/explain.rb +++ b/activerecord/lib/active_record/explain.rb @@ -11,11 +11,12 @@ module ActiveRecord end end - # If auto explain is enabled, this method triggers EXPLAIN logging for the - # queries triggered by the block if it takes more than the threshold as a - # whole. That is, the threshold is not checked against each individual - # query, but against the duration of the entire block. This approach is - # convenient for relations. + # If the database adapter supports explain and auto explain is enabled, + # this method triggers EXPLAIN logging for the queries triggered by the + # block if it takes more than the threshold as a whole. That is, the + # threshold is not checked against each individual query, but against the + # duration of the entire block. This approach is convenient for relations. + # # The available_queries_for_explain thread variable collects the queries # to be explained. If the value is nil, it means queries are not being @@ -26,7 +27,7 @@ module ActiveRecord threshold = auto_explain_threshold_in_seconds current = Thread.current - if threshold && current[:available_queries_for_explain].nil? + if connection.supports_explain? && threshold && current[:available_queries_for_explain].nil? begin queries = current[:available_queries_for_explain] = [] start = Time.now diff --git a/activerecord/lib/active_record/railtie.rb b/activerecord/lib/active_record/railtie.rb index 13b7c6e214..055d27d85c 100644 --- a/activerecord/lib/active_record/railtie.rb +++ b/activerecord/lib/active_record/railtie.rb @@ -83,6 +83,13 @@ module ActiveRecord end end + initializer "active_record.validate_explain_support" do |app| + if app.config.active_record[:auto_explain_threshold_in_seconds] && + !ActiveRecord::Base.connection.supports_explain? + warn "auto_explain_threshold_in_seconds is set but will be ignored because your adapter does not support this feature. Please unset the configuration to avoid this warning." + end + end + # Expose database runtime to controller for logging. initializer "active_record.log_runtime" do |app| require "active_record/railties/controller_runtime" -- cgit v1.2.3