In Oracle Open World 2014 the Zero Data Loss Recovery Appliance (ZDLRA) was released and it changed MAA in many ways, but two principals: protection and backup. I watched the ZDLRA presentation and saw that matched with the needs that I had that time.
After OOW in 2014 I started the project (all phases, from conception, requirements until deployments and usage) that become (in 2015) the first ZDLRA installation in Brazil, and one of the first of the world too that use replicated ZDLRA to protect both sites (primary and standby) and many levels of databases (PRO, TST, DEV). The Oracle MAA at its finest was amazing: ZDLRA + Exadata + DG; everything integrated to protect both sites.
Because of the high design level of the project it was chosen to be one of the main presentation in Oracle Open World 2015 about ZDLRA, you can find the link of the presentation that I made together with ZDLRA dev team here. As told before, in this project was integrated two ZDLRA, two Exadata and DG to reach ZERO Recover Point Objective (RPO) and Recovery Time Objective (RTO) and beside that, reduce backup time. You can see the presentation to check the scope and other details.
With the new 19c version the Data Guard received some attention and now we can do DML over the standby and it will be redirect to primary database. It is not hard to implement, but unfortunately there is no much information about that in the docs about that.
As training exercise I tested this new feature and want to share some information about that. First, the environment that I used (and the requirements too):
- Primary and Standby databases running 19c.
- Data Guard in Maximum Availability .
- Active Data Guard enabled.
Remember that the idea of DML over the standby it is to use in some cases where your reporting application need to update some tables and few records (like audit logins) while processing the data in the standby. The volume of DML is (and will be) low. At this point there is no effort to allow, or create, a multiple active-active datacenters/sites for your database. If you start to execute a lot of DML in the standby side you can impact the primary database and you adding the fact that you can maximize the problems for locks and concurrency.
Every year Oracle arrives and release new version of Exadata with a plenty of new things. We have the natural evolution from hardware (more memory, more cpu…) and sometimes news features from software side. The point for this post today it is not about the HW and SW things, but something is hidden in the small lines of the new X8.