Category Archives: Replication

ZDLRA, How to Maintain the Native Replication

The native replication for ZDLRA does not require a lot of maintenance or complicate tasks to keep it running. In my previous posts, I already wrote about an explanation about replication, how to configure the replication network between ZDLRA’s, how to configure the replication server, how to create the replication config (that links everything is done before), and how the replication protect the database. In this post, I will show some details that you need to monitor and to do maintain it running without errors.

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ZDLRA, Protecting Databases with Replication

The replication for ZDLRA works differently than normal DataGuard, but you can reach almost the same level of multiple site protection with that. The replication for ZDLRA is not complicated but can be divided into several steps. Basically, to protect a database (since you have everything configure) is done linking the database with the protection policy that is replicated.

In my previous posts, I already wrote about all the steps to reach this configuration. Starting with an explanation about replication, how to configure the replication network between ZDLRA’s, how to configure the replication server,  and how to create the replication config (that links everything is done before).

But most of the time we don’t need to pass through all of these steps. Usually, the ZDLRA is deployed with the replication network already configured, or you already deploy two ZDLRA’s that will operate replicated. This part I consider the “physical” part of the configuration because evolves network and details that we usually don’t touch after configured. The “logical” part comes after and evolves all the definitions about what policies will be replicated, which databases will be part of each policy, and so on. This “logical” configuration I explained in this previous post.

But it is important to know how it’s working to understand all the details. And if you need, you can check my posts about the replication for ZDLRA.

In this post, I will show more details on how the ZDLRA replication impact over the backup for your database, and show the protection occurs to reduce your RPO to a minimum.

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ZDLRA, Creating the Replication Config

The replication from ZDLRA is easy to configure and operate. Most of complex part resides for policy management and define correctly what will be replicated. I already wrote about the basics for ZDLRA Replication in this post, and how to configure the dedicated network for replication in another post.

But also wrote how to startup and configure the replication server in another post. This is the first step and needs to be done before what I will describe in this post, they are the “physical” configuration. Here I will show the “logical”  configuration for native ZDLRA replication and how correctly define it to avoid problems.

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ZDLRA, Creating the Replication Server

The replication for ZDLRA operates in several ways, from a single upstream/downstream config to a multiple replication config, but both are done using the same procedure. The process is not complicated but has some details that are needed to be aware to avoid reconstruct (or even loss) replicated data. In this post, I will show the details to create the replication config.

The base about how the replication works for ZDLRA I wrote in this post. And how to configure the replication network config in this other post. This network configuration needs to be done just when you are adding the replication after the ZDLRA has been deployed, if you already deployed with replication enabled it is not needed. The official documentation about replication can be found here.

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ZDLRA, Configuring Replication Network

Is common that our systems grow with time, and the environment that sustains it needs to improve. And the same occurs for ZDLRA. Imagine that now you added a new datacenter and bought a new ZDLRA and want to replicate between them, or that now you want to enable the replication, configuring it.

This is possible and is not complicated to do, and I will show here how to do that. So, in this post, I will show how to configure the replication network for ZDLRA that was already deployed. Basically a post-install procedure.

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ZDLRA, Replication

The replication for ZDRLA works differently than a “normal” for Oracle Database that uses Data Guard (or even Golden Gate). The point is to replicate the ingested backup “as is” between ZDLRA’s and not datafile block replication. And, of course, it is completely different from tape clones.

ZDLRA replication is not just sent backup from one site to another, it is how to increase your protection and be part of the disaster recovery strategy. The replication does not occur just for “rman backups”, but also for archivelogs generated for Real-Time Redo. And adding, this is how you integrate ZDLRA at your MAA architecture that makes the difference and how you protect your environment and reach zero RPO. There are several points about replication, how it operates, modes, and integration for Oracle MAA universe. I will discuss some points here in this post.

The architecture

The architecture for ZDLRA replication it is simple. There are two important definitions:

  • Upstream: It is the ZDLRA that receives the backup and forward it to another ZDLRA
  • Downstream: Is the ZDLRA that receives the backup from another ZDLRA

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