Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
ActiveRecord::PostgreSQLAnalyzer gem を作った話 #m3dev
Search
Takayuki Matsubara
December 22, 2015
Programming
1
200
ActiveRecord::PostgreSQLAnalyzer gem を作った話 #m3dev
M3 Tech Talk で「ActiveRecord::PostgreSQLAnalyzer gem を作った話」というタイトルで LT したときの資料です。
#m3dev
Takayuki Matsubara
December 22, 2015
Tweet
Share
More Decks by Takayuki Matsubara
See All by Takayuki Matsubara
Rails Web Development with AWS Lambda
ma2gedev
0
240
Coding Challenge Advent of Code 2019
ma2gedev
0
120
Developer Experience in GraphQL Schema-first Development
ma2gedev
0
2.2k
Dependency Inversion Principle in Keyboard Firmware
ma2gedev
0
450
OSSの歩き方 / Walking with OSS
ma2gedev
10
2.5k
GraphQL 開発で必要になったこと / What we needed for GraphQL development
ma2gedev
0
1.1k
キーボードをカスタムしてプログラミング環境を良くした話 / Improved programming environment with customizing keybords
ma2gedev
0
1.3k
Translating "Erlang in Anger" with Erlang & Elixir community members
ma2gedev
0
2.8k
Dive into Elixir v1.6 Code Formatter
ma2gedev
1
160
Other Decks in Programming
See All in Programming
クリーンアーキテクチャから見る依存の向きの大切さ
shimabox
5
1.1k
たのしいSocketのしくみ / Socket Under a Microscope
coe401_
8
1.3k
AIの力でお手軽Chrome拡張機能作り
taiseiue
0
190
Boost Performance and Developer Productivity with Jakarta EE 11
ivargrimstad
0
860
CSS Linter による Baseline サポートの仕組み
ryo_manba
1
150
パスキーのすべて ── 導入・UX設計・実装の紹介 / 20250213 パスキー開発者の集い
kuralab
3
910
機能が複雑化しても 頼りになる FactoryBotの話
tamikof
0
190
Go 1.24でジェネリックになった型エイリアスの紹介
syumai
2
290
Serverless Rust: Your Low-Risk Entry Point to Rust in Production (and the benefits are huge)
lmammino
1
150
[JAWS DAYS 2025] 最近の DB の競合解決の仕組みが分かった気になってみた
maroon1st
0
120
PHPカンファレンス名古屋2025 タスク分解の試行錯誤〜レビュー負荷を下げるために〜
soichi
1
680
sappoRo.R #12 初心者セッション
kosugitti
0
280
Featured
See All Featured
ピンチをチャンスに:未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
114
50k
Writing Fast Ruby
sferik
628
61k
Designing for humans not robots
tammielis
250
25k
Art, The Web, and Tiny UX
lynnandtonic
298
20k
How to Think Like a Performance Engineer
csswizardry
22
1.4k
Gamification - CAS2011
davidbonilla
80
5.2k
[Rails World 2023 - Day 1 Closing Keynote] - The Magic of Rails
eileencodes
33
2.1k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
Statistics for Hackers
jakevdp
797
220k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
666
120k
Easily Structure & Communicate Ideas using Wireframe
afnizarnur
193
16k
Java REST API Framework Comparison - PWX 2021
mraible
29
8.4k
Transcript
ActiveRecord::Postgr eSQLAnalyzer gem Λ࡞ͬͨ !
ࣗݾհ
TODO: !
⭐ github.com/ma2gedev/ power_assert_ex
ActiveRecord::PostgreSQLAnalyzer https://github.com/m3dev/ active_record- postgresql_analyzer
͖͔͚ͬ
m3 advent calendar
SAStruts + S2JDBC ͷࢥ͍ग़ʹ͍ͭͯ ଘʹޠΔ #m3dev — @seratch http://qiita.com/ seratch@github/items/
826f1b4a89993d3b0804
Sequential Scan ݕ
ศརͦ͏ ͪͳΈʹ͜ͷΞΠσΞࣗମ S2JDBC ʹݶఆ͞Ε·ͤΜɻࠓͬͨϓϩδ ΣΫτͰ Scala ͷΞϓϦέʔγϣϯ Ͱಉ͡Α͏ͳίʔυΛॻ͍ͨͷͰ͢ ͕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
όζͬ ͨʂʁ
όζͬͯͳ ͍
ͩ͞·͞͠ऑऀ͗ͯ͢ࠔͬͨͷͰ Scala ͰίϯύΠϧ͢Δ͜ͱʹͨ͠ — @seratch http://qiita.com/ seratch@github/items/ 3be26b584f3d74aa1150
͍ํ
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)
Έ
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 షΓΕ ࢭ
ActiveRecord::PostgreSQLAnalyzer https://github.com/m3dev/ active_record- postgresql_analyzer
⭐ github.com/ma2gedev/ power_assert_ex
end