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Oracle releases new version of converged database

Thu 14 Jan 2021
FYI, this story is more than a year old

Oracle Database 21c, the latest version of the company’s converged database, is now available on Oracle Cloud, including the Always Free tier of Oracle Autonomous Database. 

Oracle Database 21c contains more than 200 updates, listed below.

Database 21c provides support for multi-model, multi-workload, and multi-tenant requirements within a single converged database engine. 

In addition, Oracle announced the availability of Oracle APEX (Application Express) Application Development, a new low-code service for developing and deploying data-driven enterprise applications quickly and easily. 

The browser-based, low-code cloud service enables developers to create modern web apps for desktops and mobile devices using an intuitive graphical interface.


New features


Immutable Blockchain Tables 

Blockchain Tables bring the key security benefits of blockchain technology to enterprise applications. 

Part of Oracle's Crypto-Secure Data Management, Blockchain Tables provide immutable insert-only tables whose rows are cryptographically chained together. 

By providing tamper detection and prevention capabilities directly in the Oracle Database, customers can protect against illicit changes by insiders or hackers impersonating administrators or users. 

Blockchain Tables are part of the converged database, accessed with standard SQL, and support full analytics and transactions. 

Blockchain Tables are a free feature in all Oracle Database editions.


Native JSON Data Type

Database 21c adds a new JSON data type representation, enabling up to 10x faster scans and up to 4x faster update operations. 

Overall, these improvements make Oracle SQL/JSON 2x faster than MongoDB and AWS DocumentDB on the YCSB benchmark. 

As with previous releases, users can mix or join JSON and other data types, index any JSON element for fast OLTP, use declarative parallel SQL analytics across all formats, and run complex joins across multiple JSON documents and collections without custom application code.


AutoML for In-Database Machine Learning

Automatically builds and compares machine-learning models at scale, and facilitates the use of machine learning by non-experts. A new AutoML user interface makes it easier for non-expert users to leverage in-database machine learning.

Oracle also added new algorithms for anomaly detection, regression, and deep learning analysis to our extensive library of popular, in-database machine learning algorithms.


In-Database JavaScript

The embedded Graal Multilingual Engine allows JavaScript data processing code to run inside the database – where the data resides – eliminating network round-trips. 

In addition, users can easily execute SQL from within JavaScript code, and JavaScript data types are automatically mapped to Oracle Database data.


Persistent Memory Support 

Stores database data and redo logs in local Persistent Memory (PMEM), which significantly improves the performance of IO-bound workloads. SQL runs directly on data stored in the direct-mapped Persistent Memory file system, eliminating the IO code path and the need for large buffer cache. In addition, new database algorithms prevent partial or inconsistent stores to Persistent Memory.


Higher Performance Graph Models 

Allows modelling of data based on relationships, and enables exploration of connections and patterns in social networks, IoT, and more. 

Further improvements in memory optimisation reduce the amount of memory required to analyse larger graphs, which enables existing applications to run faster with no changes. 

In addition, users can create or extend graph algorithms using Java syntax, which can execute as native algorithms since they are compiled with the same optimisations.


Database In-Memory Automation 

Oracle supports both row and column formats in the same table to allow analytics and transactions to run simultaneously on the same table. Oracle Database 21c introduces a Self-Managing In-Memory Column Store that simplifies and improves efficiency by automatically managing the placement and removal of objects in the In-Memory Column Store, then tracks usage patterns and moves and evicts objects from the column store. In addition, columns are automatically compressed based on usage patterns. Oracle Database 21c also introduces new in-memory vector join algorithms to speed up complex queries.


Sharding Automation 

Native Database Sharding delivers hyperscale performance and availability while enabling global enterprises to meet data sovereignty and data privacy regulations. 

Data shards share no hardware or software and can reside on-premises or in the cloud. 

To simplify the design and use of sharding, Database 21c includes a Sharding Advisor Tool that assesses a database schema plus its workload characteristics and then provides a sharded database design optimised for performance, scalability, and availability. 

Backup and Recovery across shards is also automated.

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