How to apply RI (Reserved instance) in RDS? My RI is not applied

Question

Hi all,

I was bouth an RI that has profile is db.t4g.micro in ap-southeast-1 for my MariaDB RDS instance successfully.
I'm running an MariaDB that has profile is db.t4g.micro in ap-southeast-1a.
But I have been paid for RI and my current RDS instance, my cost is x2.

Help me

Didier_Durand · Accepted Answer

Hi,

Can you via CLI execute `aws rds describe-reserved-db-instances` in your region to see if you have a proper reservation and its status ?

You'll get something like the below to make sure that 1/ your RI is active 2/proper region 3/ proper sql DBMS

```
RESERVATION  ReservationId     Class        Multi-AZ  Start Time                Duration  Fixed Price  Usage Price  Count  State    Description  Offering Type
RESERVATION  MyReservation     db.r3.small  y         2011-12-09T23:37:44.720Z  1y        455.00 USD   0.092 USD    1      retired  mysql        Partial  Upfront
```
If everything is correct, you will have to open a ticket to AWS Support to fix it for you: RIs are applied automatically to billing. So, there is not much that you can further do on your own.

Best,

Didier

Skyvn · Answer

My RI and my current instance is No Multi-AZ, I was create an case on AWS and waiting for AWS support center answer for me

AmerO · Answer

Hi, What is the configuration for your RDS, is it Multi-AZ? If so, then you are technically running two instances, one is active and the other one is provisioned as a standby. Your cost will be your RDSx2.
You will need consider to select Multi-AZ option in the RI if you are running with that set up..

You can use your cost explorer, then filter the services to show only RDS.
In the dimensions, select purchase options. That view will show you how much of your cost is covered by the RI and what is left of on-demand.

How to apply RI (Reserved instance) in RDS? My RI is not applied

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