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Don't run explain on slow queries for database adapters that don't su…

…pport it
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commit 50e86135287a9e573d6f7afa30550f9b3ab90137 1 parent 3ec4430
@blakesmith blakesmith authored
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13 activerecord/lib/active_record/explain.rb
@@ -6,11 +6,12 @@ def self.extended(base)
base.mattr_accessor :auto_explain_threshold_in_seconds, instance_accessor: false
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
@@ -21,7 +22,7 @@ def logging_query_plan # :nodoc:
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
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7 activerecord/lib/active_record/railtie.rb
@@ -136,6 +136,13 @@ class Railtie < Rails::Railtie # :nodoc:
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"
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10 activerecord/test/cases/explain_test.rb
@@ -108,6 +108,16 @@ def test_exec_explain_with_binds
assert_equal expected, base.exec_explain(queries)
end
+ def test_unsupported_connection_adapter
+ connection.stubs(:supports_explain?).returns(false)
+
+ base.logger.expects(:warn).never
+
+ with_threshold(0) do
+ Car.where(:name => 'honda').to_a
+ end
+ end
+
def test_silence_auto_explain
base.expects(:collecting_sqls_for_explain).never
base.logger.expects(:warn).never

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