How to connect clients to a database mirroring session?

How to connect clients to a database mirroring session?

To connect to a database mirroring session, a client can use either SQL Server Native Client or.NET Framework Data Provider for SQL Server. When configured for a SQL Server database, these data access providers both fully support database mirroring.

Can a SQL Server be connected to an Oracle Database?

Any Oracle client connected to the Oracle database can access SQL Server data through the gateway. The Oracle client and the Oracle database can reside on different machines. The gateway accepts connections only from the Oracle database. A connection to the gateway is established through a database link when it is first used in an Oracle session.

When is a connection established to the Oracle gateway?

A connection to the gateway is established through a database link when it is first used in an Oracle session. In this context, a connection refers to the connection between the Oracle database and the gateway. The connection remains established until the Oracle session ends.

Do you have to run the same SQL Server as the mirror server?

The mirror server instance must be running the same edition of SQL Server. A database mirroring session runs with either synchronous or asynchronous operation. Under asynchronous operation, the transactions commit without waiting for the mirror server to write the log to disk, which maximizes performance.

What does it mean to mirror a SQL Server database?

Database mirroring is a solution for increasing the availability of a SQL Server database. Mirroring is implemented on a per-database basis and works only with databases that use the full recovery model.

What happens when Database Mirroring is not synchronized?

When a database mirroring session is synchronized, database mirroring provides a hot standby server that supports rapid failover without a loss of data from committed transactions. When the session is not synchronized, the mirror server is typically available as a warm standby server (with possible data loss).

What happens when you fail over a mirror server?

During a manual failover, the principal and mirror server roles are swapped for the database on which the failover occurs. The mirror database becomes the principal database and the principal database becomes the mirror.

When to manually fail over a database mirror?

When the mirrored database is synchronized (that is, when the database is in the SYNCHRONIZED state), the database owner can initiate manual failover to the mirror server. Manual failover can be initiated only from the principal server.

How to fail over database to partner database?

ALTER DATABASE database_name SET PARTNER FAILOVER, where database_name is the mirrored database. This initiates an immediate transition of the mirror server to the principal role. On the former principal, clients are disconnected from the database and in-flight transactions are rolled back.

How to connect to failover partner in SQL Server?

Alternatively, the IP address and port number can be supplied in the Failover Partner attribute. If the initial connection attempt fails during the first connection to the database, the attempt to connect to the failover partner will be freed from relying on DNS and SQL Server Browser.