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AWS SAA Actual Exam with Questions & 100% Correct Verified Answers
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AWS SAA Actual Exam with Questions & 100% Correct Verified Answers
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AWS SAA Actual Exam with Questions & 100%Correct Verified Answers
DynamoDB Streams - ✔✔- flow of info about changes to items in DB table (captures
modifications to data items in the table)
- integrated with Lambda to create triggers
DynamoDB Global Tables - ✔✔- multi region replication solution for fast local performance
of globally distributed apps. (replicate table across choice of regions).
RDS Read Replicas - ✔✔- (performance)
- Ec2 connects to RDS backend (DNS) = perfect copy of master. Secondary can be queried for
same data as master, promote read replicas to be own production if needed
- small amount of replication lag (not updated as quickly)
- asynchronous replication - highly scalable
AWS Global Accelerator - ✔✔- directs traffic to optimal endpoint worldwide ( 2 static IP's),
improved user pipeline (user to application)
- reduce # of hops to get to resources (edge location)
- use cases (gaming, IoT, Voice over IP), fast regional failover
Aurora Serverless - ✔✔Simple, on demand, autoscaling config (instance automatically scaled
up or down and starts on or off based on your application usage).
- usecase for infrequent, intermittent, unpredictable workloads, and cheaper = only pay for
invocation
Aurora - ✔✔- MySQL/ PostfreSQL RDBMS 1/10 cost
,- auto failover to replicas
- cluster of instances (handler = endpoint)
- 2 copies in 3 AZ for 6 total copies
- self-healing
- replication = 15 copies
- reader endpoints = for read operations (queries)
DynamoDB Accelerator (DAX) - ✔✔- fully managed, in memory cache that can reduce
response times from ms to microseconds for request volume
- scale on demand to 10-node cluster
- improves write performance
- will fail over to replicas in another AZ
Cold vs Hot Storage - ✔✔- Hot storage refers to the storage that keeps frequently accessed
data (hot data).
- Warm storage refers to the storage that keeps less frequently accessed data (warm data).
- Cold storage refers to the storage that keeps rarely accessed data (cold data).
DynamoDB - ✔✔- table, item, attribute
- collection (foundational table), document (row in SQL db), key-value pairs (fields within row)
- SSD (fast), 3 geographic regions
- high cardinality (I/O performance) = distinct partition key
- parallel processing
DynamoDB Key Types - ✔✔Simple Primary = partition key
Composite Primary = partition + sort
- sort key is used to sort items with same partition
- allows for sophisticated query patterns
, DynamoDB Secondary Index
- Local
- Global - ✔✔Local Secondary = same partition key as underlying table but different sort key
Global Secondary = entirely different primary key for a table.
EBS Volume - ✔✔- block-level storage attached to single EC2
- persist independent of running life of instance
- primary storage for data that requires frequent updates
- can be used for throughput intensive applications that perform continuous disc scans
SSD vs HDD - ✔✔SSD = transactional *IOPS
HDD = large streaming workloads *throughput
EBS Snapshot - ✔✔- point in time copies of volumes (current state)
- constrained to region created
- asynchronous
API Gateway - ✔✔- front door for applications to access data, logic, end-service
- fully managed service
- throtle by global or service call
- handles all tasks involved in accepting and processing calls, traffic management, authorization
and access control, monitoring, and API version management
S3 Presigned URL's - ✔✔- limited time permission to download view private S3
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