What is data redundancy SQL?
Data redundancy occurs when the same piece of data is stored in two or more separate places. Suppose you create a database to store sales records, and in the records for each sale, you enter the customer address. The address that is repeatedly entered is redundant data.
Is Azure SQL Database zone redundant?
Azure SQL Database offers zone redundant Premium databases and elastic pools. You can also enable it for existing databases or pools. Once the zone redundant option is enabled, Azure SQL Database will automatically reconfigure the database or pool without any downtime.
What is SQL clustering?
SQL Server clustering is the term used to describe a collection of two or more physical servers (nodes), connected via a LAN, each of which host a SQL server instance and have the same access to shared storage. To improve performance, you need to upgrade the computing power of the servers.
What is redundancy in database with an example?
Data redundancy is the repetition or superfluity of data. Data can appear multiple times in a database for a variety of reasons. For example, a shop may have the same customer’s name appearing several times if that customer has bought several different products at different dates.
What is Zone redundancy?
Zone-redundant storage (ZRS) replicates your Azure Storage data synchronously across three Azure availability zones in the primary region. Each availability zone is a separate physical location with independent power, cooling, and networking.
What is the difference between Azure SQL and managed instance?
The most significant difference from SQL Database and SQL Managed Instance is that SQL Server on Azure Virtual Machines allows full control over the database engine. Optimized for migrating existing applications to Azure or extending existing on-premises applications to the cloud in hybrid deployments.
Why is shrinking a database bad?
The major problem with the Shrink operation is that it increases fragmentation of the database to very high value. Higher fragmentation reduces the performance of the database as reading from that particular table becomes very expensive. One of the ways to reduce the fragmentation is to rebuild index on the database.
How do I free up space in SQL?
Freeing up space in local SQL Server Databases
- Shrink the DB. There is often unused space within the allocated DB files (*. mdf).
- Shrink the Log File. Same idea as above but with the log file (*. ldf).
- Rebuild the indexes and then shrink the DB. If you have large tables the indexes are probably fragmented.
How do I backup SQL Server?
Open SSMS and connect to the SQL Server Expand Databases and select the required database Right click on the database >> Tasks >> Backup In Back Up Database window, select the Backup Type as Full and under Destination, select Back up to : Disk Select the Remove button Click on Add button to select the destination and name for the database backup file
What is a redundant SQL Server?
SQL Server Redundancy is a process in which a specialized tool replicates data directly from the database to an auxiliary system that is independent from mainline production environments. complicated reporting tasks on the same data set will not degrade the performance of normal business operations.
What is high availability in SQL Server?
High Availability means that the SQL Server instances or databases will be available and reachable, with the least possible downtime, in case of any server crash or failure.
