Solved

MSSQL High Aviabalability questions?

Posted on 2012-03-28
5
314 Views
Last Modified: 2012-04-21
We are using MS SQL 2008 with R2 in Windows 2008 server

1). I am planing to implement HA to my company. I know in MS SQL, we can do mirroring, log shipping and replication. Can someone tell me what is the difference among them? What advantages and disadvantages for them?

2). Can we do replication for system database? what is the per-requsite for doing transaction replication?

3). After the log shipping is done, can we create tables or add field to table in standby server. Do it cause the log shipping job down if I do so?

4). What mode should I use when doing log shipping?
0
Comment
Question by:wasabi3689
5 Comments
 
LVL 37

Assisted Solution

by:momi_sabag
momi_sabag earned 50 total points
Comment Utility
you need to be more specific with your requirements
by ha you mean:
1) you want an additonal stand by instance you will be able to fall back to when the main instance fails
2) you want to add more instances to spraed the work load since a single instance can't handle all the work
3) where would the different nodes be physically (same lan, same san etc...)
4) how much latency between the nodes can you efford if any at all?
5) how fast should the switching between them be?
0
 
LVL 10

Assisted Solution

by:sqlservr
sqlservr earned 100 total points
Comment Utility
1).it depends upon on your requirement , if you want aotomatic failover , you can user Mirroring,
manual Log shiping is good.
2). Can we do replication for system database? what is the per-requsite for doing transaction replication?
no we cant do replication for system databases,
pre requist
1_ both the db should be in FUll recovery mode, suggested to be
2) good power full NIC cards
3) plan how you RAID are perofrming.

3). After the log shipping is done, can we create tables or add field to table in standby server. Do it cause the log shipping job down if I do so?
asolutely no
as the databases are in the standby(readonly) and no recovery mode, additions are not allowed

4). What mode should I use when doing log shipping?

Full recovery mode
and both the Servers principle and standy should be started with the same user account,
0
 

Author Comment

by:wasabi3689
Comment Utility
One more question about replication.

Can we do a replication for a table without any key set and index?
0
 
LVL 75

Accepted Solution

by:
Anthony Perkins earned 50 total points
Comment Utility
Can we do a replication for a table without any key set and index?
No.  The table requires a Primary Key.
0
 
LVL 10

Assisted Solution

by:sqlservr
sqlservr earned 100 total points
Comment Utility
no we cant to transactin replciation, withour a primary key in
.

we can do merge replication for   that
0

Featured Post

Get up to 2TB FREE CLOUD per backup license!

An exclusive Black Friday offer just for Expert Exchange audience! Buy any of our top-rated backup solutions & get up to 2TB free cloud per system! Perform local & cloud backup in the same step, and restore instantly—anytime, anywhere. Grab this deal now before it disappears!

Join & Write a Comment

International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
The Delta outage: 650 cancelled flights, more than 1200 delayed flights, thousands of frustrated customers, tens of millions of dollars in damages – plus untold reputational damage to one of the world’s most trusted airlines. All due to a catastroph…
Via a live example combined with referencing Books Online, show some of the information that can be extracted from the Catalog Views in SQL Server.
Via a live example, show how to set up a backup for SQL Server using a Maintenance Plan and how to schedule the job into SQL Server Agent.

744 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now