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ActiveRecord::PostgreSQLAnalyzer gem を作った話 #m3dev
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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
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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