How many SQL servers are needed for simple redundancy?
I am quite a rookie here and would like to ask all you experts out here on the preferred method of configuring two SQL Servers (2008 R2 and above) for a simple redundancy with the following characteristics: There are 2 computers. Each will have its own SQL Server, and also its own windows service writing timestamped data regularly to the DB.
Why is data redundancy necessary in a DBM?
Data redundancy in DBMS can be prevented by database normalization. As mentioned previously by Gordon, redundancy is sometimes necessary is for performance reasons and recovery purposes. for recovery using replication redundancy. For efficiency you must try to avoid repeating data on multiple tables.
Why is redundant data generally a bad idea?
Redundant data is a bad idea because when you modify data (update/insert/delete), then you need to do it in more than one place. This opens up the possibility that the data becomes inconsistent across the database.
What to do when SQL Server native client connection fails?
You can specify the availability group listener of a given availability group in the connection string. If a SQL Server Native Client application is connected to a database in an availability group that fails over, the original connection is broken, and the application must open a new connection to continue work after the failover.
When to set applicationintent = readonly in SQL Server?
When you set ApplicationIntent=ReadOnly, the client requests a read workload when connecting. The server enforces the intent at connection time, and during a USE database statement. The ApplicationIntent keyword doesn’t work with legacy read-only databases.
What does multisubnetfailover mean in SQL Server Native Client?
The MultiSubnetFailover connection property indicates that the application is being deployed in an availability group or Failover Cluster Instance, and that SQL Server Native Client will try to connect to the database on the primary SQL Server instance by trying to connect to all the IP addresses.