Skip to main content

Posts

Showing posts from 2014

Rebuilding Standby Database Manually (11g and up)

One of my remote customers has been facing severe network outages between Production and DR sites to reasons unknown and challenges with certain geographic limitations, the bandwidth between sites is limited to 2MBPS and the replication between sites is aching slow. So, Customer has had tentative requirements to rebuild Standby more often between sites until the network issue is fully resolved.

This paper outlines the procedure to rebuild the STANDBY manually provided we have following things in place already between/on sites. And this procedure has a special case for One node RAC, Oracle dynamically applies SID naming convention in case of an online relocation. Due to this fact, I have to mention which SID to export before logging to the Database via SQLPLUS/RMAN/ASMCMD
(PR refers to - Production/Primary and PR1/PR2 are two nodes in RAC,  DR refers to - Disaster Recovery/Standby and DR1/DR2 are two nodes in RAC at DR Site)

A working Dataguard Configuration between Sites (All Paramete…

Oracle Database 12c - Far Sync Instance

A New Standby destination type is allowed in 12c Active Dataguard environment that ensures zero data loss failover and zero performance impact on Primary Database by a new concept called "Far Sync Instance". 

What is Far Sync Instance?
As we knew so far (until 11g), A SYNCHRONOUS redo transport Dataguard configuration impacts the availability and performance of Primary Database in order to protect data loss that happens due to network outages with its Standby Site. To avoid such issues and give benefit of the same zero Data loss to customers at additional cost, Oracle has introduced a new type of Instance called Far Sync Instance.  A Far Sync Instance usually is very close in distance to its Primary Database Network receives the redo synchronously from its Primary partner and then pushes it to its remote Standby Partner, plays a dummy physical standby role that actually fakes its Primary Partner to forget network outages as it takes the responsibility of managing redo to actua…