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Flashcards in Deck 2 Deck (31)
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1

Difference between physical RDS replication and logical

Logical is software based and physical is block based

2

RDS types that use physical replication

MySQL, Oracle, & Postgres

3

RDS instance type that use logical replication

MSSQL (server native mirroring)

4

What mechanism provides the failover for RDS HA?

DNS, your clients always use an endpoint

5

How can you force failover on an RDS instance?

Reboot the instance

6

How can you reboot a RDS instance?

webUI or the RebootDBInstance

7

How many read replicas can you have of Postgres and MySQL?

5

8

What will happen if you create a read replica of a DB that does not have multi-AZ enabled?

Brief IO pause during the snapshot

9

What RDS database can have read replica of read replicas?

MySQL

10

Can you take snapshots or backup from RDS read replicas?

No

11

What Cloudwatch metric indicates the amount of time in seconds that the read replica is behind the source database

ReplicaLag. Bad lag can also indicate performance issues.

12

What might you have to do if you are unable to create read replicas RDS?

Edit and enable backups

13

What are the two ways you can monitor RDS

Metrics and Events

14

Which RDS Metric indicates the number of outstanding I/O requests (read and write) waiting to access the disk.

diskQueueDepth

15

Which RDS Metric indicates the number of database connections in use.

DatabaseConnections

16

RDS metrics that tells you how much disk space is available in Bytes

FreeStorageSpace

17

Which RDS metrics that shows the average number of disk I/O operations per second for reads and the other for writes

ReadIOPS
WriteIOPS

18

How ofter is an ELB monitored

Every 60 seconds unless there is no traffic

19

ELB metric the is a count of the total # of requests pending submission

SurgeQueueLength

20

ELB metric that would show the # of requests being rejected due to a full queue

SpilloverCount

21

Reasons for instance start failures on an autoscaling config

Key pairs deleted, config not working correctly, autoscaling group not found, instance type not supported, the AZ is no longer supported, Invalid EBS mapping, autoscaling not enabled on your (older) account, attempting to attach EBS to an instance store.

22

AWS service that allow root access

EC2
Elastic BeanStalk
Elastic Map Reduce
Ops Works

23

When is a health check error triggered

error = interval x threshold

24

How does a an ELB balance sessions by default?

Based on load

25

ELB sticky sessions is also known as what?

Session Affinity

26

Difference between ELB Duration Based sticky states and Application Based

Duration based is a cookie provided by the ELB and the expiration is based on the load balance algorithm. Application based are special cookies used to assign the session back to the original session.

27

How to pre-warm an ELB

You must contact Amazon and provide start and end datas, expected request rate per second, and total size of request/response rate that you are expecting

28

AWS is responsible for the security on which services?

DynamoDB, RDS, Redshift, Elastic Mapreduce, Workspaces

29

Trusted advisor currently only inspects which service

IAM

30

EBS encryption type and where the compute occurs

256 AES and on the attached EC2 instance (that is why only the larger instances are supported for encryption)