Oracle RAC with Standard Edition (SE) 2 is not supported in 19c

Introduction
For so many years (starting in the early 2000's, when 10g was released) Oracle RAC option (Real Application Clusters) was available with Oracle Standard Editions; even when Oracle introduced Oracle Standard Edition 2 (SE2) back in version 12.1.0.2 (see my blog post about SE2 here), they offered the RAC option.

19c Update
With the introduction of the recent 19c release, Oracle did a pretty significant change with SE2 which I believe is worthy of a blog post.
Oracle RAC has been de-supported effective with Oracle Database 19c.
According to Oracle, "SE2 Socket requirements are hard to meet as hardware evolves." In addition, they claim that "SE Oracle RAC has seen diminishing demand with increased high availability requirements, as SE does not provide the full set of high availability capabilities available in the Oracle Database Enterprise Edition".

My Own View

I personally feel like Oracle licensing is too strict and with this recent change it became even stricter. For example, I always believed that Diagnostics and Tuning packs should have been part of the Enterprise Edition by default. I felt like the move to Standard Edition 2 back in 12.1.0.2 was strict as it was more limited than Standard Edition with the same price. I believe that the recent 19c SE2 change is a (valid) tactic to move people to Oracle cloud. The positive news is that from my experience of working with my customer base, the impact on the market should be very low as it's pretty rare to see customers use SE2 with RAC given the limitations of SE2.

Additional Information 

• https://www.slideshare.net/MarkusMichalewicz/oracle-rac-19c-with-standard-edition-se-2-support-update

Oracle Database 19c is Live!

I hope that by now most of you already heard the exciting news that Oracle 19c is GA on Linux x86-64 (since 25-Apr-2019) and on Oracle Solaris SPARC 64-bit (since 26-Apr-2019). Other platforms such as Windows, HP UX, IBM AIX, etc. are targeted to be release in Q2CY19 according to Document ID 742060.1 on MOS (My Oracle Support) titled "Release Schedule of Current Database Releases"

Where should I test some of the cool new features and enhancements?
You can access LiveSQL which is a cloud-based, free platform to rung and share SQL and PL/SQL. For more info, see: https://blogs.oracle.com/oracle-database/oracle-database-19c-now-available-on-livesql

How to mitigate the performance/protection trade-off in Oracle Data Guard - Part 2 (Axxana)

Introduction

In the previous blog post titled "How to mitigate the performance/protection trade-off in Oracle Data Guard"  I reviewed the common performance vs. protection trade-off between the various data protection modes in Data Guard : Maximum performance (default), maximum availability and maximum protection.

In that blog post I mentioned how far syn can be used in order to achieve both performance (due to the smaller network latency between primary and local far sync instance) while allowing for higher data protection as the far sync instance is always synced with the primary database.

The Challenge
As the far sync instance is located in a near location to the primary database (probably the same data center), what happens if the entire data center is down due to an unexpected site disaster?
In that case there is a good chance that some of the transactions are not protected as there is an asynchronous replication between the far sync instance and the standby instance. In other words, even when using Far sync, it's not possible to guarantee RPO-0 (zero data loss).

Optional Solution
One solution that I came across in several Oracle conferences (such as Oracle OpenWorld and IOUG Collaborate) which you may consider is Axxana
Axxana is like an Oracle Database "black box" which provides a protected storage unit with DR capabilities Installed at the production site, the Black Box is designed to withstand a wide variety of extreme conditions that may occur during a disaster.

According to the official Azxxana website: "Axxana’s Phoenix for Oracle Far Sync, supported by Oracle, is a self-contained, physically indestructible solution that houses, protects, and supports the Oracle Far Sync instance from within the primary (production) data center. Because a nearby data center is not needed, the risk of a nearby synchronous site failing (e.g., due to a power outage or downed communication lines) no longer exists. Zero data loss is guaranteed, increasing the probability of successful failover. In addition, because the instance can reside at the primary site, communication lines are a matter of feet instead of miles and network latency is negligible. Given that it easily and cost-effectively resolves the challenges associated with standalone versions of Far Sync, there is simply no good reason to use the Far Sync software on any other platform—or for that matter, to use three data centers. IT leaders owe it to their company and their customers to take advantage of the risk reduction, cost savings, and other opportunities that Phoenix for Oracle Far Sync offers."

How to mitigate the performance/protection trade-off in Oracle Data Guard

Introduction
The most know trade-off in Oracle Data Guard is the performance vs. protection.
Oracle Data Guard brings several protection modes, which brings companies the flexibility in choosing the right configuration in order to meet the application SLA policies.

Data Protection Modes
There are 3 protection modes in Oracle Data Guard, which can be summarized in the following table:

Data Protection Modes - Key Considerations

•  Maximum Performance = compromise on protection 
•  Maximum Protection = compromise on performance (usually)
•  Better to use at least 2 standby databases when running maximum protection
•  NET_TIMEOUT parameter of LOG_ARCHIVE_DEST_n=30 seconds (default)

Mitigating the performance/protection trade-off in Oracle Data Guard
Oracle 12cR1 introduced a feature which can enable both performance and protection for far standby environments. For example, when the standby database is very far from the primary database, setting a "maximum protection" configuration will likely affect the performance due to the network lag and it may take time to acknowledge commit back to the primary database.
In order to address this challenge, Oracle introduced a feature  called "Far Sync". Far Sync enables having a lightweight instance which resides close to the primary database and is synchronized with the primary database. This light-wight instance has only control files, standby redo logs and archived redo logs. It does not have data files and therefore it cannot be opened for access. The redo entries will be transported from the near "far sync" instance to the "regular" standby database asynchronously.
This feature enables achieving both performance (due to the smaller network latency between primary and far sync instance) while allowing for higher data protection as the far sync instance is always synced with the primary database.

Here is an illustration of this new feature:

Licensing

This feature requires having the Active Data Guard license which is an extra option in Oracle Enterprise Edition. For more information about licensing: https://docs.oracle.com/en/database/oracle/oracle-database/18/dblic/Licensing-Information.html#GUID-B6113390-9586-46D7-9008-DCC9EDA45AB4

Useful Links

• Oracle Documentation: https://docs.oracle.com/database/121/SBYDB/create_fs.htm#SBYDB5416
• White Paper: https://www.oracle.com/technetwork/database/availability/farsync-2267608.pdf

RMOUG 2019 - Slide Decks Are Available!

Hi everybody,

I'd like to share with you the slide decks I presented on April 21 in the Rocky Mountain Oracle User Group (RMOUG) conference.
Thanks to everybody who attended my sessions.

Winning Performance Challenges in Oracle Standard Editions

Oracle Diagnostics and Tuning packs offer comprehensive, valuable performance diagnostics and tuning features such as AWR, ADDM, ASH, ASH Analytics, etc. These optional packs can be licensed only on top of the Oracle Enterprise Edition. Without these packs, diagnosing performance issues may become an overly complex task even for advanced DBAs. In this session, we’ll explore how you could use Oracle’s Statspack report and dictionary views to diagnose performance issues even without using any expensive editions and packs. Also, we’ll see how Quest tools can help DBAs diagnose and solve even the most complex performance issues without relying on the Diagnostics and Tuning packs and for all the Oracle Database editions.

https://www.slideshare.net/PiniDibask/winning-performance-challenges-in-oracle-standard-editions-132800192

Oracle Data Guard for Beginners

Oracle Data Guard is one of the most important options in the Oracle Database, as it allows organizations to ensure high availability, data protection and disaster recovery for their Oracle database environments. In this session, we’ll review the Oracle Data Guard solution from A to Z.

https://www.slideshare.net/PiniDibask/oracle-data-guard-for-beginners-134714942