Pros of using PostgreSQL Copy with Activerecord-copy You’ll also notice where I created the time stamp time = that’s because Rails will not create time stamps for you automatically with COPY. Note that when you use the activerecord-copy gem, the time stamp is not created for you automatically. The activerecord-copy gem adds a copy_from_client method to all your model classes, as shown in the snippet above (you’ll have to define the columns and their values as shown). foreach (filename, headers : true ) do |row | User. Task :single_record = > :environment do #This function loops over the content of the csv file and creates a new record for each of them. # lib/tasks/one_record_at_a_time.rake require 'csv' require "benchmark"ĭesc "imports data from csv to postgresql" Here’s a sample code to do this in Rails, assuming we have the source data in a CSV file: One easy way to load data to a Postgres database is to loop through the data and insert them one at a time. Other articles and resources you might like Speed comparison of different ways to load data into Postgres with Rails Using background jobs to load data to your Postgres databaseįinal Thoughts About Loading Large Data Sets into a PostgreSQL Database with Rails Cons of using PostgreSQL Copy with Activerecord-copyĤ.Pros of using PostgreSQL Copy with Activerecord-copy. ![]() Using PostgreSQL Copy with Activerecord-copy to load data to your Postgres database Cons of Bulk Inserts with Active Record in Ruby on Rails and Postgres.Pros of Bulk Inserts with Active Record in Ruby on Rails and Postgres.Cons of single-row inserts with Postgresīulk Inserts with Active Record Import to load data to your Postgres database.Pros of single-row inserts with Postgres.Inserting one record at a time to load data to your Postgres database So what’s the fastest way to load data to a Postgres database in your Rails app? Let’s look at four different methods, and then we’ll see which is the fastest. ![]() However, with the wrong tools and solutions, its powers can be undermined. PostgreSQL has a strong reputation for handling large data sets. According to a recent study by DB-Engines (PDF), PostgreSQL’s popularity rating increased by 65 percent from January 2016–January 2019, while the rating of MySQL, SQL Server, and Oracle decreased by 10–16 percent during the same period. We’ll go over their pros and cons, so you can choose the method that works best for your situation. In this article, I’ll explain a few ways to load data to a PostgreSQL database with Rails. There are several ways you can load data from an old Rails app or other application to Rails. Whether you are loading data from a legacy application to a new application or you just want to move data from one database to another, you’ll most likely need to create a migration script that will be accurate, efficient, and fast to help with the process - especially if you are planning to load a huge amount of data. Data migration is a delicate and sometimes complicated and time-consuming process.
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