Can the provisioned storage size of an RDS decrease if auto scaling is enabled?

Question

I made the RDS with t4g.small instance and 100GiB of general purpose SSD(gp2)

single AZ, no Proxy but enabled storage auto scaling

After testing for 133 hours, I reviewed the billed charges, but there was a part that I couldn't understand.

![bill](/media/postImages/original/IMVX0vIVcHTKKHzCmbfD-CJA)

why does the charge for storage usage is recorded for 17.655GB-Mo, I thought it should have been 100GB-Mo that I provisioned at the very first

of course it's thanks for me that they didn't charge the whole provisioned storage

but it makes me confused.

Accepted Answer

Hi,

Memory is billed based GB-Mo: so 133h is approx 133 / (24h x 31d) = 17.8% of a month .
So, 17.665GB-Mon  is not that far 17.8&% of 100 GB if you take into account some rounding errorrs, etc.

Hence your current bill. It will increase if you let it run for longer based on the ratio above.

Best,

Didier

Can the provisioned storage size of an RDS decrease if auto scaling is enabled?

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