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New Replication and Recovery Features in PostgreSQL 9.1

1. Streaming Replication and Continuous Archiving Features. a. Synchronous Replication PostgreSQL 9.1 came with Synchronous Replication. In Synchronous Replication, all commited transaction will be transferred to standby synchronously. When Primary is in Synchronous replication, then each commit transaction will wait untill transaction get transfered to Slave/Replication Server. This reduces the loss of any committed transaction. And gives high degree of durability. For setting up synchronous replication you can look at my blog: http://vibhorkumar.wordpress.com/2011/10/20/asynchronoussynchronous-streaming-replication-in-postgresql-9-1/ 2. New parameter replication_timeout:  This is a new parameter which has been added in 9.1. Using this parameter user can terminate replication connection, if connection is inactive more than replication_timeout seconds. This is useful parameter for Primary Server to detect Replication Server Crash or network outage. 3. New role/permission