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My first attempt was the most straight-forward attempt… I’m taking the CSV file, looping over the records and saving them.(0.1ms) BEGIN Product Exists (0.6ms) SELECT 1 AS one FROM "products" WHERE "products"."sku" = '123' LIMIT 1 SQL (0.3ms) INSERT INTO "products" ("sku", "name", "origin", "msrp_cents", "created_at", "updated_at") VALUES (

My first attempt was the most straight-forward attempt… I’m taking the CSV file, looping over the records and saving them.(0.1ms) BEGIN Product Exists (0.6ms) SELECT 1 AS one FROM "products" WHERE "products"."sku" = '123' LIMIT 1 SQL (0.3ms) INSERT INTO "products" ("sku", "name", "origin", "msrp_cents", "created_at", "updated_at") VALUES ($1, $2, $3, $4, $5, $6) RETURNING "id" "sku", "123"], ["name", "n"], ["origin", "Russia"], ["msrp_cents", 1000], ["created_at", "2015-12-05 .896705"], ["updated_at", "2015-12-05 .896705" (6.1ms) COMMITWhat we don’t see is that there is a lot going on behind the scenes as well.

Rails is having to talk over TCP to the database four times for each record, plus it is having to build two different SQL statements, each time.

This article is about speeding up bulk imports in Rails. not an absurd amount, but enough that we can start to notice some pain and enough that we wouldn’t want to keep the user sitting there while the system tries to import them all.

That is unless we can figure out a way to have these records imported quickly.create_table "products", force: :cascade do |t| t.string "sku", null: false t.string "name", null: false t.string "origin", null: false t.integer "msrp_cents", null: false t.datetime "created_at", null: false t.datetime "updated_at", null: false end add_index "products", ["sku"], name: "index_products_on_sku", unique: true, using: :btree field to be unique, and the other fields to not be null.


For example, what if we need multiple forms to be able to send our selection to different controllers in our application?

Luckily, this last part is quick thanks to some work by Tenderlove on Adequate Record Pro where the query construction is import_products2: :environment do require 'csv' CSV.foreach("#/tmp/products.csv") do |p| product = Product.new(sku: p[0], name: p[1], origin: p[2], msrp_cents: p[3]) product.save_for_bulk_import!

end end The way we have our code now, each of the 50,000 products gets its own database transaction.

All in all, we were able to get 50,000 records into the database from 59 seconds all the way down to 4.6 seconds, around 12 times faster.

This will be the first article in a series, outlining how to implement a bulk edit in Rails 3.1.1 (although most any version of Rails will do).

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