Like other services in AWS, DynamoDB has some default soft limits set on the service to prevent us from consuming the backend resources unintentionally. If required, the service soft limits can be extended by contacting AWS. The soft limits in DynamoDB are set as follows:
- Depending on the region, each DynamoDB table will be limited either to 10,000/40,000 read and 10,000/40,000 write capacity units per table and double that for all tables in the account in provisioned mode. There is no soft limit on the cumulative RCU/WCU capacity for all on-demand capacity mode tables.
- Up to 256 tables of unlimited size per region per account.
- A maximum of 20 global secondary indexes per table.
There are also some limitations in the service itself due to the service design, and these are as follows:
- One RCU = one strongly consistent read of up to 4 KB or two eventually...
