ActiveRecord::Postgr eSQLAnalyzer gem Λ࡞ͬͨ࿩ !

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TODO: !

⭐ github.com/ma2gedev/ power_assert_ex

ActiveRecord::PostgreSQLAnalyzer https://github.com/m3dev/ active_record- postgresql_analyzer

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m3 advent calendar

SAStruts + S2JDBC ͷࢥ͍ग़ʹ͍ͭͯ ଘ෼ʹޠΔ #m3dev — @seratch http://qiita.com/ seratch@github/items/ 826f1b4a89993d3b0804

Sequential Scan ݕ ஌

ศརͦ͏ ͪͳΈʹ͜ͷΞΠσΞࣗମ͸ S2JDBC ʹݶఆ͞Ε·ͤΜɻࠓ೥΍ͬͨϓϩδ ΣΫτͰ͸ Scala ͷΞϓϦέʔγϣϯ Ͱ΋ಉ͡Α͏ͳίʔυΛॻ͍ͨͷͰ͢ ͕ɺඇৗʹ༗༻Ͱͨ͠ɻ — @seratch

Ruby(RoR)͸ʁ

ͳ͚Ε͹࡞Ζ ͏ OSS

ActiveRecord::PostgreSQLAnalyzer https://github.com/m3dev/ active_record- postgresql_analyzer

Rails ͰγʔέϯγϟϧεΩ ϟϯ͍ͯ͠ΔΫΤϦΛݟ ͚ͭͯḿΓ͍ͨ - PostgreSQL ݶ ఆ http://qiita.com/ma2ge/ items/0df91b0fbd90808f40d5

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ͩ͞·͞͠ऑऀ͗ͯ͢ࠔͬͨͷͰ Scala ͰίϯύΠϧ͢Δ͜ͱʹͨ͠࿩ — @seratch http://qiita.com/ seratch@github/items/ 3be26b584f3d74aa1150

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Gemfile gem 'active_record-postgresql_analyzer', group: :development

Output logfile if sequential scan is detected ------------ find Seq Scan query ------------ SELECT "todo".* FROM "todo" WHERE "todo"."user_id" = $1 LIMIT 1 QUERY PLAN --------------------------------------------------------------------------------------------- Limit (cost=10000000000.00..10000000001.67 rows=1 width=81) -> Seq Scan on todo (cost=10000000000.00..10000000001.67 rows=1 width=81) Filter: (user_id = 13) (3 rows)

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ActiveSupport::Notifications ActiveRecord::PostgreSQLAnalyzer::LogSubscriber.attach_to :active_record https://github.com/m3dev/ active_record-postgresql_analyzer/ blob/master/lib/active_record/ postgresql_analyzer.rb#L42

Explain ActiveRecord::Base.connection.explain(payload[:sql], payload[:binds]) https://github.com/m3dev/ active_record-postgresql_analyzer/ blob/master/lib/active_record/ postgresql_analyzer.rb#L22

Detect Sequential Scan SELECT "todo".* FROM "todo" WHERE "todo"."user_id" = $1 LIMIT 1 QUERY PLAN --------------------------------------------------------------------------------------------- Limit (cost=10000000000.00..10000000001.67 rows=1 width=81) -> Seq Scan on todo (cost=10000000000.00..10000000001.67 rows=1 width=81) Filter: (user_id = 13) (3 rows) https://github.com/m3dev/ active_record-postgresql_analyzer/ blob/master/lib/active_record/ postgresql_analyzer.rb#L23

index షΓ๨Ε๷ ࢭ

ActiveRecord::PostgreSQLAnalyzer https://github.com/m3dev/ active_record- postgresql_analyzer

⭐ github.com/ma2gedev/ power_assert_ex

end