You are a database administrator for a Microsoft SQL Server 2012 database named AdventureWorks2012.
You create an Availability Group defined by the following schema. (Line numbers are included for reference
only.)

You need to implement an AlwaysOnAvailablity Group that will meet the following conditions:
Production transactions should be minimally affected. The secondary server should allow reporting queries to
be performed. If the primary server goes offline, the secondary server should not automatically take over.
Which Transact-SQL statement should you insert at line 06?

A.
AVAILABILITY_MODE = SYNCHRONOUS_COMMIT,
FAILOVER_MODE = MANUAL
SECONDARY_ROLE (
ALLOW_CONNECTIONS = READ_ONLY,
READ_ONLY_ROUTING_URL = ‘TCP://SecondaryServer:1433’) PRIMARY_ROLE (
ALLOW_CONNECTIONS = READ_WRITE,
READ_ONLY_ROUTING_LIST = NONE)

B.
AVAILABILITY_MODE = SYNCHRONOUS_COMMIT,
FAILOVER_MODE = MANUAL
SECONDARY_ROLE (
ALLOW_CONNECTIONS = READ_ONLY,
READ_ONLY_ROUTING_URL = ‘TCP://SecondaryServer:1433’)

C.
AVAILABILITY_MODE = ASYNCHRONOUS_COMMIT,
FAILOVER_MODE = MANUAL
SECONDARY_ROLE (
ALLOW_CONNECTIONS = READ_ONLY,
READ_ONLY_ROUTING_URL = ‘TCP://SecondaryServer:1433’)

D.
AVAILABILITY_MODE = ASYNCHRONOUS_COMMIT,
FAILOVER_MODE = MANUAL
SECONDARY_ROLE (ALLOW_CONNECTIONS = YES,
READ_ONLY_ROUTING_URL = ‘TCP://SecondaryServer:1433’)

Explanation:
As production transaction should be MINIMALLY affected we should use asynchronous-commit mode.
Incorrect Answers:
A, B: Synchronous-commit mode emphasizes high availability over performance, at the cost of increased
transaction latency.
D: ALLOW_CONNECTIONS cannot be set to YES. The syntax is:
ALLOW_CONNECTIONS = { NO | READ_ONLY | ALL }
https://docs.microsoft.com/en-us/sql/database-engine/availability-groups/windows/availabilitymodes-always-on-availability-groups