Thank you so much @dakopraz and congrats! I will try again 2nd attempts soon. I had similar questions like yours as well. Below are few I still need some guidance, please advise.
“For example, one question I recall was something about c4.large with EBS io1 Provisioned IOPS and disk read and write performance issues. Have already tried 1000 iops, tried 2000 iops, but the performance problem remains. What should you do next?”
Should it B) Convert to c4.xlarge the right choice?
“M2 with classic load balancer and predictable steady load. how to reduce costs? Can we even get m2 reserved instances? is alb cheaper than classic load balancer? Is m5 cheaper than m2?”
I guess ALB cheaper since it asked for steady load, although M5 has RI and M2 does not.
RDS for Oracle - there was a backup questions specific to Oracle that I didn’t know. Think they were trying to throw me off by saying Oracle. Not specific to Oracle, remember the two ways that RDS backups: 1) automated during user specified window. 2) DB snapshots.
I don’t member if other options are auto backup or snapshots but I do remember something like RMANBackup command option.
If you chose to install the Oracle Secure Backup Cloud Module, the Quick Start performs an initial, complete backup of your database to the S3 bucket you specified in the Quick Start parameters.
You can use the /tmp/rmanbackup.cmd script to perform new backups or to schedule backup tasks and customize the settings for your needs.
You can also schedule your backups by using Crontab or another scheduling tool.
“VPC Flow logs - always questions on these and what exactly can be enabled: vpc, subnet, eni and how to read them. One question said RDC didn’t work but the flow logs showed send OK, receive OK, so what’s wrong? The answer must be the NACL on the bastion subnet deny the return traffic. This one was very tricky.”
I picked the Window firewall issue since I thought we cannot see windows log in VPN Flow logs, so I guess I got this one wrong ;(