Hot tech 20161207 - ep0021 - IDERA - Protect your database - High availability for high demand data

1. @dez_blanchfield
High Availability Database Challenges

2. @dez_blanchfield
What do we mean when we
talk about database systems &
database platform availability

3. @dez_blanchfield
What does it mean to think about High Availability, is there a
silver bullet or is it a lot more complex that that..
Is it uptime ( i.e. five 9’s )
What about service level agreements
Load balancing & Fault tolerance
Active / Standby or Active / Active
Multiple servers & storage
Redundant replicated networks & datacenters
Are we talking about N+1
No single point of failure
What do we mean by High Availability
!?

4. @dez_blanchfield
When we talk about database availability we usually end up
talking about percentages in nines..
One Nine = (90%) = 36.5 days downtime p/yr
Two nines (99%) = 3.65 days downtime p/yr
Three nines (99.9%) = 8.76 hours downtime p/yr
Four nines (99.99%) = 52.56 mins downtime p/yr
Five nines (99.999%) = 5 .26mins downtime p/yr
Six nines (99.9999%) = 31.5 seconds downtime p/yr
What difference can a single nine make
%

5. @dez_blanchfield
There is no single silver bullet
when it comes to availability,
and one size does not fit all

6. @dez_blanchfield
Availability
A measure of the time that a server or process functions normally for general
usage, as well as a measure of the amount of time that the recovery process
requires after a component failure.
High Availability
System design and implementation that achieves system and data availability
almost all of the time, 24 hours a day, 7 days a week, and 365 days a year. High
availability does not equate to 100% availability. To achieve 100% availability is not
a cost-effective reality for the large majority of implementations today; rather, it is
a goal.
Availability In A Plain English Definition

7. @dez_blanchfield
Cost & Complexity VS Type of service being delivered..
Availability VS Types of Service

8. @dez_blanchfield
The tradeoff balance between High & Continuous availability..
Investment VS Return in Availability

9. @dez_blanchfield
Mean Time Between Failure
Or
Mean Time To Recover

10. @dez_blanchfield
When it comes to database and supporting infrastructure High
Availability, everyone has their own needs and wants..
What can your organisation afford
What can your business support
What skills & technology do you have in-house
Can you outsource some of the challenge
What type of market or customer are you servicing
Meeting product / service / industry norms
On-prem / externally hosted / in the cloud
My Availability is not Your Availability
!!

11. @dez_blanchfield
Matching desired or required
availability with performance &
business needs is no mean feat, it
takes time effort & money