Needs advice
on
PostgreSQLPostgreSQLMySQLMySQL
and
MongoDBMongoDB

Hello,

I am trying to design an online ordering app similar to Doordash or Uber Eats. I'm having a hard time trying to finalise on what database (or mixture of databases) to use. I'm leaning towards using a relational database like MySQL or PostgreSQL. But, when the application grows, I don't want to join on 20 tables to get a data. Any help would be greatly appreciated. Thank you for your time.

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7 upvotes25.4K views
Replies (2)
Avatar of voilacabs
CTO at Voila Cab's
Recommends
MySQLMySQL

Hello Suhas , We build our product www.voilacabs.com which is in the same lines as yours but we have used a combination of Mysql and MongoDB. When using MySQL, i would recommend doing the following: 1. Use Mysql only for storage only and for realtime updates we recommend MongoDB. 2. Don't try to Join more than 3 tables. ( the moment you reach 3 join stop there and try to un-normalized database. 3. Never or very rarely use Auto-increments. ( we recommend using UUIDS ) . Use UUIDS always for Auto increments for MYSQL. If you using Postgre SQL then i would suggest you to please check this https://instagram-engineering.com/sharding-ids-at-instagram-1cf5a71e5a5c There is a stored procedure that generated unique keys instead of auto-increment keys and that will help you sharding or clustering database without sync errors. 4. Also For MongoDB if you can put a layer of REDIS Cache then that will boost your api performance under large loads. 5. Use Node.js programing language as that function asynchronously .

Let me know if you still need any suggestion's . Thanks & Regards Rupen Makhecha CTO @ Voila Cab's www.voilacabs.com

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4 upvotes3 comments17.2K views
Avatar of rafeyirahman
Cofounder at Wanderloop
Recommends
MySQLMySQL
at

I would recommend a mixture of MySQL and MongoDB. Using MongoDB for the Content Distribution Network (CDN) will make it easy to store high volume incoming data. MySQL is recommended to be used for business logic. PostgreSQL is not recommended since you will be faced with inefficient database replication features and constant migration from one PostgreSQL version to another.

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1 upvote2 comments17.3K views
Avatar of suhas krishna