![]() During a subnet failover, the Microsoft JDBC Driver for SQL Server will aggressively retry the TCP connection. During a multi-subnet failover, the client will attempt connections in parallel. multiSubnetFailover enables faster failover for all Availability Groups and failover cluster instances in SQL Server 2012 (11.x) and will significantly reduce failover time for single and multi-subnet Always On topologies. Connecting with multiSubnetFailoverĪlways specify multiSubnetFailover=true when connecting to the availability group listener of a SQL Server 2012 (11.x) availability group or a SQL Server 2012 (11.x) Failover Cluster Instance. Also, because a connection can fail because of an availability group failover, you should implement connection retry logic, retrying a failed connection until it reconnects. Increasing connection timeout and implementing connection retry logic will increase the probability that an application will connect to an availability group. Rest of the connection attempts follow the same logic as in the multiSubnetFailover feature. When transparentNetworkIPResolution is true, the first connection attempt uses a timeout value of 500 ms.transparentNetworkIPResolution is ignored if there are more than 64 IP addresses.transparentNetworkIPResolution is ignored if database mirroring is used.transparentNetworkIPResolution is ignored if multiSubnetFailover is true. ![]() transparentNetworkIPResolution is true by default.If the first attempt fails, the driver tries to connect to all IP addresses in parallel until the timeout expires, discarding any pending connection attempts when one of them succeeds. When transparentNetworkIPResolution is true, the driver attempts to connect to the first IP address available. ![]() For more details, see the sections below.īeginning in version 6.0 of the Microsoft JDBC Driver for SQL Server, a new connection property transparentNetworkIPResolution (TNIR) is added for transparent connection to Always On availability groups or to a server that has multiple IP addresses associated. Use applicationIntent to declare the application workload type.
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