Currently Sumo Logic doesn’t have a direct way of ingestion of the AWS RDS logs.
The only option is to push the RDS logs to S3 and ingest using an S3 source on a hosted collector.
Looking at the AWS documentation here: http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_LogAccess.html
You can view, download, and watch database logs using the Amazon RDS console, the AWS Command Line Interface (AWS CLI), or the Amazon RDS API. Viewing, downloading, or watching transaction logs are not supported.
To set up an S3 source on a hosted collector please refer AWS_S3_Source
Before creating an S3 source, you will need to create a hosted collector if you don't already have one
Also, I did find a public repository that you may find helpful, here is the link: https://github.com/ryanholland/rdslogs_to_s3 .
Note: Since this article is was not created by Sumo Logic all questions must be directed to the author of this Git.