AWS, CloudPrep notes – AWS Certified Associate Architect

Prep notes – AWS Certified Associate Architect

RDS

  • Six available – MySQL, MSSQL, Oracle, Postgre, MariaDB, Aurora
    • You can have auto and manual snapshots
    • Manual snapshot can persist even after the RDS is terminated
    • RDS can be restored to the latest second using transaction log and automatic snapshots
    • From disaster recovery perspective implement backup processes that meets your
      • Recovery Point Objective (RPO) – how far back
      • Recovery Time Objective (RTO) – time to recover
  • NoSQL – Dynamodb
    • Fully managed distributed database
    • Eventual read consistency – read may loose most recent write(less than 1 sec)
    • Strong read consistency –  read will accounts for all writes(delay is accounted)
    • Data stored on SSD maintains 3 copies across AZ
  • Redshift – is Amazon columnar Data-warehouse
    • It can have upto 128 nodes
    • Columnar compression give better performance
    • One Master node manages traffic
    • Keeps 3 copies (the original and replica on the compute nodes and a backup on Amazon S3). Retention from 1 day to 35 days
  • Read Replica – Asynchronized copy of the database
    • Read replica is for high demand, high availability
    • Not available for MS-SQL database
    • Can have upto 5 read replica, which can be cross region
    • Backup must be turned on for read replica
  • Stand by – Is different than read replica.
    • It is synchronous backup of primary
    • During failover DNS automatically points to stand by
    • During backup primary’s performance is impacted as I/O is suspended. For MariaDB, MySQL, Oracle, and PostgreSQL, I/O activity is not suspended because the backup is taken from the standby
  • Aurora
    • Backups 6 copies, 2 in each AZ. Hence it is available in regions with at least 3 AZ
    • MySQL can be promoted to Aurora
    • Can have upto 15 read replica

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