PostgreSQL as a secret weapon for high-performance ... - PGCon

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Rails as ORM > Attribute Preloading The conventional Rails way is not so bad: Tasks Tags Tasks_Tags id serial id serial tag_id integer name varchar name varchar task_id integer tasks = Task.find(:all, :include => :tags) select * from tasks select * from tags inner join tasks_tags on tags.id = tasks_tags.tag_id where tasks_tags.task_id in (1,2,3,..) Gleb Arshinov & Alex Dymo ● PostgreSQL as a secret weapon for high-performance Ruby on Rails applications ● PGCon 2010 8 / 58
Rails as ORM > Multiplying Queries create table Task ( id serial not null, parent_id integer ) But classical ORM problem exists: class Task < ActiveRecord::Base acts_as_tree end Uses N+1 database queries to load N nodes from the tree: (root) select * from tasks where parent_id = nil - 1 select * from tasks where parent_id = 1 - 11 select * from tasks where parent_id = 11 - 111 select * from tasks where parent_id = 111 - 112 select * from tasks where parent_id = 112 - 12 select * from tasks where parent_id = 12 - 2 select * from tasks where parent_id = 2 - 21 select * from tasks where parent_id = 21 Gleb Arshinov & Alex Dymo ● PostgreSQL as a secret weapon for high-performance Ruby on Rails applications ● PGCon 2010 9 / 58
Page 1 and 2: Gleb Arshinov, Alexander Dymo PGCon
Page 3 and 4: Web Development Pains ● Performan
Page 5 and 6: Outline ● Rails as ORM ● Optimi
Page 7: Rails as ORM > Myths and Realities
Page 11 and 12: Rails as ORM > Generating Queries 4
Page 13 and 14: Rails as ORM > Query Tests rev 834:
Page 15 and 16: Rails as ORM > Query Tests rev 834:
Page 17 and 18: Rails as ORM > Query Tests module A
Page 19 and 20: Rails as ORM > Data Integrity ● M
Page 21 and 22: Rails Performance > Ruby ● Good l
Page 23 and 24: Rails Performance > Rails ● Has a
Page 25 and 26: Rails Performance > Performance Tes
Page 27 and 28: Rails Performance > Solution Scalab
Page 29 and 30: Rails Performance > Solution Delega
Page 31 and 32: Rails Performance > Attribute Prelo
Page 33 and 34: Rails Performance > Access Control
Page 35 and 36: Rails Performance > Access Control
Page 37 and 38: Rails Performance > Aggregations Pe
Page 39 and 40: Postgres Experience > Good Things G
Page 41 and 42: Postgres Experience > Limitations A
Page 43 and 44: Postgres Experience > Limit/Offset
Page 45 and 46: Postgres Experience > in() and Join
Page 47 and 48: Postgres Experience > generate_seri
Page 49 and 50: Postgres Approaches ● Benchmarkin
Page 51 and 52: Optimize Database > Basics How to o
Page 53 and 54: Optimize Database > Shared Database
Page 55 and 56: Optimize Database > Shared Database
Page 57 and 58: Optimize Database > Postgres Config

PostgreSQL as a secret weapon for high-performance ... - PGCon

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