AWS Database, Messaging and Application Services Quick Notes (Numbers)

  1. Elasticache for redis support both single-node and up to 15-shard clusters are available, enabling scalability to up to 3.55 TiB of in-memory data.

  2. For standard SQS queues, there can be a maximum of 120K inflight messages per queue. For FIFO SQS queues, max is 20K.

  3. The default message retention period in SQS is 4 days.

  4. In SQS, you can set the message retention period to a value from 60 seconds to 1,209,600 seconds (14 days) using the SetQueueAttributes action. 

  5. With long polling in SQS, consumer requests wait until a message is available or the long polling request times out. Maximum timeout is 20 seconds.

  6. All customers can make 1 million Amazon SQS requests for free each month.

  7. SQS messages can contain upto 256 KB of text in any format.

  8. A single request can have from 1 to 10 messages, up to a maximum total payload of 256 KB.

  9. Each SQS queue starts with a default setting of 30 seconds for the visibility timeout. Maximum timeout is 12 hours.

  10. First 1 million Amazon SNS requests per month are free.

  11. Amazon SNS currently allows a maximum limit of 256 KB for published messages.

  12. In SNS, each 64KB chunk of published data is billed as 1 request.

  13. The maximum life-span of an SWF task or workflow execution is 1 year.

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About is my blog to share notes and learning materials on Cloud and Data Analytics. My current focus is on Amazon Web Services.

I like to write. I try to document what I learn and share with others. I believe that knowledge is useless unless you share it; the more you share, the more you learn.

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