Remote Standalone (RS) secondary

The primary purpose of the RS secondary server is to provide a disaster recovery solution. As in HDR, the primary server sends all its logical log records to the RS secondary server continuously, except now only in an asynchronous manner. Unlike HDR, the communication occurs using a full duplex protocol. Thus, the RS secondary is less sensitive to network latency and can more easily reside in a distant geography. One characteristic of an RS secondary is that unlike in SD and HDR servers, the primary server doesn't synchronize checkpoints with an RS secondary. Thus, it is not immediately ready to take the place of the primary; it must be changed into an HDR server first. Should multiple failures in a cluster occur, however, an RS node can prevent your database from being entirely unavailable.

Table 1. Important ONCONFIG parameters for the RS secondary
Configuration parameter Server type Supported values Description
LOG_INDEX_BUILDS Primary
  1. - Disable index page logging
  2. - Enable index page logging
 While creating a new index at primary server, Index Page Logging(IPL) writes index pages to logical log file. Index page logging must be enabled at primary server to add RS server to a cluster.