DynamoDB

Question 1

DAX Dynamo DB acccelerator

Answer 1

gives 10X performance
fully managed , highly available in-memory cache
Unlike Redis, mem-cached, DAX is a write through cache

Question 2

Transactions

Answer 2

all or nothing operations
two underlying reads or writes - prepare/commit.
Transactyions can operate up to 25 items or 4 MB data.

Question 3

Rates

Answer 3

Pay-per-request

Only storage and backups

Question 4

On demand back up

Answer 4

zero impact on table performancce or availability

backups are consistent within seconds and retained until they are deleted.

Operated within the same region as source table

cannot do backups and restores cross region

Question 5

Point-in-Time recovery

Answer 5

protects against accidental writes or deletes

Restores to any point in the last 35 days

Incremental backups

not enabled by default.

Latest restorable - 5 minutes in the apst

Question 6

Streams

Answer 6

Time-ordered sequence of item-level-changes in a table

stored for 24 hrs

Inserts, updates and deletes.

Question 7

Global Tables

Answer 7

Managed Multi-master, multi-region replication

Globally distributed applications

based on dynamo db streams

multi region redundancy for DR or HA

Replication latency under 1 sec

with Global tables enable streams

Question 8

Security

Answer 8

Encryption at rest using KMS

Site-to-Site VPN

Direct Connect (DX)

IAM Policies and Roles

Fine grained access

Cloud watch and Cloud trail

VPC endpoints