DynamoDB Local Terrible Performance

Question

DynamoDB local is taking 100+ ms to perform a single put operation against my table. The docs say that throughput is ignored for local dbs, and is only limited by the speed

Answer 1

It's been a while since you asked your question but I still want to give some background information.

MongoDB is so fast because it buffers the updates in memory before writing them to disk. You can read more about this in the official MongoDB FAQ here

DynamoDBLocal on the other hand is quite slow because it uses a SQLite database behind the scenes (You can check this by opening the *.db file in the DynamoDBLocal directory with a SQLite Browser) and SQLite has very slow write speeds compared to other databases. More info here.

DynamoDBLocal is just a basic tool for local development that wraps a subset of the DynamoDB API around a simple SQLite database. The real DynamoDB, of course, does not rely on SQLite and is much faster.