High AWS RDS Cost from last month

Can you provide more detail from Cost Explorer. That'll help understand what has increased.

If you have old MySQL or Postgres versions, this could be due to extented support. The price of extended support does vary from $0.10/vcpu/hour upto $0.21/vcpu/hour (depending on region) that is a significant uplift on top of RDS compute (cpu/mem) pricing.

• https://aws.amazon.com/about-aws/whats-new/2023/09/amazon-aurora-rds-extended-support-mysql-postgresql-databases/
• https://aws.amazon.com/rds/mysql/pricing/
• https://aws.amazon.com/rds/postgresql/pricing/

Here is cost for rds, there is sudden spike from last month.