The SQL Server Database application boasts of an array of high availability options
Availability is undoubtedly one of the most important tasks for a database administrator but the key lies in choosing the best suitable options that are designed for different purposes. In other words, if you are worried to use a high availability solution for your SQL Server Database, then you must know about the five SQL Server High Availability Options. Keeping this in mind, we are here to enlighten you with scope of these High Availability Options.
- Windows Failover Clustering: One of the most important high availability option offered for SQL Server Database is the Windows Failover Clustering that has been especially designed to give sever level protection. In fact, the main purpose of clustering is that it helps provide automatic failover and on top of it, it can be implemented using 16 nodes but to use this option, you need Windows Server Enterprise Edition or higher.
- Log Shipping: Second important high availability option for SQL Server 2016 is the log shipping that is also considered to be a disaster recovery technology. The advantage of this option is to transfer the transaction logs on periodic order from the primary system to other secondary systems. Good news is that log shipping is a feature that is supported in SQL Server Standard as well as Enterprise editions.
- Live Migration and VMotion: Another important availability option offered for SQL Server is the Live Migration and VMotion. Based on virtualization, these technologies have been especially designed for addressing planned downtime. The main purpose of these features is to enable a VM and to allow the user to perform all kinds of scheduled maintenance such as hardware repair and host patching; however, one must know that Windows Server 2008 R2 or Hyper-V Server 2008 R2 is required for enabling Live Migration option.
- Fault Tolerant Solutions: Fourth cool high availability option available for SQL Server is the fault tolerant solution that aims to use redundant hardware components in order to provide amazing availability in case of a hardware failure. This very effective option is however, a bit expensive than standard x86 servers. Good news is that there are some easier options to setup as well as manage than clusters.
- Database Mirroring: Last of all, comes the Database Mirroring that aims to provide protection right at the database level. The main purpose of database mirroring is that it automatically moves forward the transaction log entries right from a principle system to a matching mirror system; however, this option is limited to two systems including the principle and the mirror. One must also note that there are two modes for database mirroring, including, high safety and high performance. High safety is meant for Enterprise edition to give automatic failover. An important thing to note about this option is that logins are same between the systems.
The SQL Server database application can crash despite best of the measures you put in place.
Like any other software, the SQL Server database is not perfect. Despite your best efforts, the database file may crash, bringing the data stored in it at risk. To avoid a possible scenario where you do not have access to your records, consider using sql recovery tool like DataNumen SQL Recovery application to recover the comprised data. This pristine tool has the best recovery rate in its class and is also capable of bring back any records that you may have inadvertently deleted.
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