Post by account_disabled on Mar 4, 2024 7:32:25 GMT
The secondary server maintains a copy of the database, but remains in an inactive and unavailable state until instructed to take over . This will happen, for example, in the event of a hardware failure on the primary server. Thanks to the transparent IP address, roles switch between the primary and secondary servers in real time . In practice, this means that all traffic is automatically redirected to the secondary server and this change takes place completely without data loss and without impact on the client . Diagram of Always On SQL Server technology Database Mirroring in SQL Mirroring is a technique that helps increase.
The availability of a SQL database by maintaining two copies USA Phone Number List of it on separate server instances. of Always On technology, which has very similar but more sophisticated functions. Mirroring, for example, only has a limited possibility of automatic failover . This is due to the absence of a transparent IP address. At the client level, it is therefore necessary to either change the address or have both available. In the SQL Standard edition, Mirroring is available only when the "Full" mode is set for the Recovery model, which enables synchronous copying of data.
However, due to its shortcomings, Mirroring is on the wane and will likely be phased out in future versions of SQL Server . This is also why it is not very suitable for deployment in new environments. SQL Replication Also, replication allows database objects to be copied from one instance to another. Unlike the previous ones, it has no failover capability at all . In the event of a failure, the IP addresses of the servers must be changed or the database clients reconfigured, which negatively affects the downtime.
The availability of a SQL database by maintaining two copies USA Phone Number List of it on separate server instances. of Always On technology, which has very similar but more sophisticated functions. Mirroring, for example, only has a limited possibility of automatic failover . This is due to the absence of a transparent IP address. At the client level, it is therefore necessary to either change the address or have both available. In the SQL Standard edition, Mirroring is available only when the "Full" mode is set for the Recovery model, which enables synchronous copying of data.
However, due to its shortcomings, Mirroring is on the wane and will likely be phased out in future versions of SQL Server . This is also why it is not very suitable for deployment in new environments. SQL Replication Also, replication allows database objects to be copied from one instance to another. Unlike the previous ones, it has no failover capability at all . In the event of a failure, the IP addresses of the servers must be changed or the database clients reconfigured, which negatively affects the downtime.