Oracle 18c: RAC New Features.. What’s NEWS..

ByJoel Pérez ( Oracle ACE Director )

Oracle 18c: RAC New Features.. What’s NEWS..

Oracle 18c: RAC New Features.. What’s NEWS..

Oracle 18c: RAC新功能一览

By Joel Peréz Skant Gupta

This article is brought by


Oracle Real Application Cluster is an Oracle solution that seems will improve in a endless way. Every Oracle Release we have new features that perhaps we never expected to have. Oracle 18c is not the exception, we have amazing new features.


Oracle EVP of Server Technologies Andy Mendelsohn said:

“We’re not going to do that with our SLAs,” he said. “We’re going to implement online patching using RAC rolling upgrades and use best practices on top of one of the most powerful and reliable platforms for running Oracle Database—Oracle Exadata.”


Oracle Autonomous Database Cloud will offer instant elasticity for databases. For Instance, now a customer can go from 8 cores of database computing to 16 cores to scale-up for end-of-quarter processing, then back down to the less expensive 8 cores. “We can do it instantly because our RAC technology lets you scale across clusters of servers very quickly, so we won’t have to move data around,” he said. “In order to grow its databases, Amazon has to move data to a new, bigger system and this can take hours or days”, he said. “That’s not truly elastic.” Mendelsohn envisioned a scenario using Oracle where, “you could even shut down all your compute CPUs over the weekend so you’re not paying for them, then start them up again on Monday morning,” he said. “That’s elastic.”


“Ask why customers run big transaction or operational systems on Oracle and their top reasons will probably be high availability, reliability, and scalability,” Mendelsohn said. These customers have grown to rely on technologies like Oracle Real Application Clusters (RAC), Oracle Active Data Guard, and Oracle’s Exadata database machine, which, he said, are unique to Oracle, “and are highly fault tolerant and scalable and that allow systems to run at 99.995 percent availability,” he said.


According to the last paragraphs, you could easily realise that Oracle RAC will be one of the key components related to the functioning of Autonomous Databases.


So.. Let’s see some technical points..


Oracle Real Application Cluster is one of the key components of Autonomous Databases for several reasons:

  • Rolling Patch
  • Rolling Upgrade
  • Domain Services Cluster Management Service (DSC) working with Machine learning ( This started in 12.2. , however in Oracle18c we will experiment a more advance functioning )
  • and more..


The DSC Management Service










Applied Machine Learning for Database Diagnostics

  • Efficient diagnosis using Machine Learning
  • Automatically performs corrective actions to prevent possible issues
  • Provides simple alerts & recommendations for issues that require manual intervention














Zero Impact Patching

Never take down a database instance to patch Grid Infrastructure

  • Zero Impact Patching enables patching of the Oracle Grid Infrastructure without interrupting database operations.
  • Patches are applied out-of-place and in a rolling fashion with one node being patched at a time while the database instance(s) on that node remain up and running.
  • Zero Impact Patching supports Oracle Real Application Clusters (RAC) databases on clusters with two or more nodes.

Convert a Standalone Cluster to Member Cluster

Member Clusters = Standalone Cluster + Benefits

• A Member Cluster is a Standalone Cluster utilizing shared services on the Domain Services Cluster

• It automatically benefits from the management, TFA & RHP service.

– ASM services are opRonal – and can be utilizing as needed


Convert a Standalone Cluster to Member Cluster


  • Easy conversion from Standalone to Member Clusters
  • Member Cluster GI version can be higher or equal to the GI version on the Domain Services Cluster

Hang Manager

Resolving cross-layer hangs in the Cluster Domain
























Hang Manager “manages” database process(es) that are not progressing

– Manage = detection and resolution

– Considers cross-layer hangs

• I.E: Hangs caused by a blocked ASM resource.


  • In addition, deadlocks are now resolved by Hang Manager
  • User defined control via PL/SQL
  • Early Warning exposed via (V$ view)

Resolving cross-layer hangs in the Cluster Domain

Up to now Oracle 18c is not still released so that we do not still too much information, however this article will be updated according to.


This is the end of this article, we hope it can be useful.. Stay tune for more Oracle Database Cloud articles.


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Author Bios:


Joel Pérez is an Expert DBA ( Oracle ACE Director, Maximum Availability OCM, OCM Cloud Admin. & OCM12c/11g ) with over 17 years of Real World Experience in Oracle Technology, specialised in design and implement solutions of: High Availability, Disaster Recovery, Upgrades, Replication, Cloud and all area related to Oracle Databases. International consultant with duties, conferences & activities in more than 50 countries and countless clients around the world. Habitual and one of leading writers of Technical Oracle articles for: OTN Spanish, Portuguese, English and more. Regular Speaker in worldwide Oracle events like: OTN LAD (Latin America), OTN MENA (Middle East & Africa), OTN APAC ( Asian Pacific), DTCC China, Oracle Code.. . Joel has always been known for being a pioneer in Oracle technology since the early days of his career being the first Latin American awarded as “OTN Expert” at year 2003 by Oracle Corp., one of the first “Oracle ACE” globally in the Oracle ACE Program at year 2004. He was honoured as one of the first “OCM Database Cloud Administrator” & Maximum Availability OCM in the world. Currently Joel works as Senior Cloud Database Architect in “Yunhe Enmo (Beijing) Technology Co.,Ltd”., company located in Beijing, China


Skant Gupta is an Oracle Certified Cloud Professional in Oracle Database 12c, an Oracle Certified Expert in Oracle Real Application Clusters (Oracle RAC) in Oracle Database 11g and 12c, and an Oracle Exadata Certified and an Oracle Certified Professional in Oracle Database 10g, 11g, and 12c. He works at Vodafone Technology in the UK and formerly worked as a senior DBA at Etisalat in Dubai. He has six years of experience with various Oracle technologies, focusing mainly on Cloud, database, and high availability solutions, Oracle WebLogic Suite, Oracle Exadata and Oracle GoldenGate. He has presented at several Oracle user groups worldwide, most recently in the US, the United Arab Emirates, and the India. Skant website link:

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Oracle 18c 新功能一览 – Enmotech BlogPosted on10:37 pm - Dec 17, 2017

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