While this list may seem long, the vast majority of the Grouparoo codebase works exactly the same regardless of if you are backing the application with SQLite or Postgres. To mitigate this, we do not use compound indexes in the Grouparoo application. Sequelize has a bug in which a migration against a table that has an index against 2 columns will make those columns unique, even if they wen’t before the migration. To help avoid SQLite deadlocks (which look like SequelizeTimeoutError: SQLITE_BUSY: database is locked), we limit the number of workers we run against a SQLite database to 1. If you using Node.JS like Grouparoo is, even a single process can generate many transactions - you might be processing many API requests in parallel, or in the case of Grouparoo, running many background tasks at once. Postgres, on the other hand, can handle many transactions at once and does a great job of merging the results and avoiding deadlocks. This makes sense, as it’s quite literally reading and writing a file on disk. SQLite can only handle one transaction at a time. Conversely, Postgres boolean values are always properly cast. This appears regularly with Sequelize’s instance.getDataValue() method. When using an ORM that supports the boolean type, most of the time it knows to covert the database’s 1 to true and 0 to false, but when accessing properties directly it may not. SQLite does not have Boolean columns, and uses integers instead. They will need to be converted to the same type in your application code. However, the resulting objects differ slightly types.min will be a JS Date object from Postgres and a string from SQLite. That means you can choose, per query, if you are ignoring case or not:Įnter fullscreen mode Exit fullscreen mode Postgres supports both the like and iLike operators for comparing strings, with the i indicating case-insensitive matching (Postgres Docs). In this blog post, I’ll be sharing the times when the differences in the SQL implementations of Postgres and SQLite matter. Sequelize does a great job of abstracting away the differences between the database types. Grouparoo uses the Sequelize Object Relational Mapper, or ORM, along with sequelize-typescript so we can work with the same Objects in our codebase, regardless of the database providing persistence. When running Grouparoo locally, you can use SQLite so no other dependencies are needed, and in the production cluster, you can use a hosted version of Postgres provided by your hosting provider. We enable our customers to run Grouparoo in a number of different ways - on their laptop with no external decencies, and as part of a large cluster with many servers processing data in parallel. Unlike most applications, Grouparoo works with 2 different types of databases - Postgres and SQLite. Like many applications, Grouparoo stores data in a relational database.
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