SQL (known as Structured Query Language) Server is the core DB (database) platform for a larger part of the today’s business-basic applications. It has lots of inbuilt features which you may use to ensure your main goal basic applications and information from catastrophes and expanded blackouts. Let’s read the blog and know some SQL server disaster recovery options.
1. Database Mirroring in SQL Server
SQL server includes a technology i.e; Database Mirroring that can give high availability (HA) or Disaster Recovery (DR). It is restricted to a single database (DB) and you can pick between synchronous and asynchronous replication. Unlike Availability Groups (AGs), Database Mirroring does not require a Windows Server Failover Cluster or Pacemaker. Nevertheless, Microsoft has devalued the Database Mirroring highlight which implies it won’t be incorporated into future editions of SQL Server. Rather, Microsoft suggests using of AlwaysOn Availability Groups (AGs) and Basic Ags.
2. AlwaysOn (AGs) Availability Groups and Basic (AGs)
AlwaysOn Availability Groups (AG) are the head SQL Server high availability (HA) and Disaster Recovery (DR) technology. AlwaysOn AGs are just given in the SQL Server Enterprise version and they give protection to various databases with programmed failover. AlwaysOn AGs require a Windows Failover Cluster on Windows Server or Pacemaker on Linux. AlwaysOn AGs work by taking a backup of the primary DB and re-establishing it to at least one optional frameworks and afterward when the AG is begun the majority of the transactions from the primary (DB) database are sent to at least one auxiliary databases.
The SQL Server Standard version gives Basic Availability Groups (AGs) which work precisely like AlwayOn AGs in the Enterprise release with the exception of that they are more confined. Basic Availability groups require you to pick between synchronous replication for high availability or replication for Disaster Recovery.
3. SQL Server Log Shipping
Log shipping is a technique which includes at least two SQL Server cases and duplicating of transaction log record starting with one SQL Server case then onto the next.
Log Shipping included with SQL (Structured Query Language) Server since the SQL Server discharge however you could establish a similar usefulness on prior variants utilizing T-SQL contents and SQL Agent jobs. Log Shipping is bolstered on both the Standard and Enterprise versions of SQL Servers.
Log Shipping permits a client indicated delay between when the essential server backs up the log documents and when the objective servers apply the log reinforcements. Log shipping does not give robotized failover.
4. SQL Server Failover Clustering
Generally, an HA (known as high availability) technology, AlwaysOn FCI give server-level security from spontaneous failure with programmed failover & no loss of data. Like you may envision, On Win Server, AlwaysOn FCI requires a Win Server Failover Cluster & afterward SQL Server should be installed on every hub utilizing the SQL Server clustered installation alternative. On the Linux operating system, you have to user Pacemaker.
AlwaysOn FCI is upheld on the Standard and Enterprise versions of SQL Server 2017 however it is constrained to two hubs on the Standard release. AlwaysOn FCI can be used for Disaster Recovery by using geo-clustering where the distinctive cluster node is an independent physical areas some of the time in totally extraordinary districts. Win Server 2008 and above supports multi-site clusters.
5. Backup of SQL Server
Backup is & has dependably been the most principal Disaster Recovery (DR) technology. SQL Server allows you to backup DB databases utilizing either the SQL Server Management Studio (SSMS), T-SQL commands or PowerShell. SQL Server full backup of database, differential and log file backups. Most of the enterprises, businesses, and organizations play out a full backup of database regularly. After that, perform a differential backup in the middle of a full backup. Afterward Transaction log backup gives you the authority to restore the database to point in time you pick. Backup of SQL server supports both the compression & encryption.