Features of Oracle Database

Oracle Database 19c, is the long term support release of the Oracle Database 12c and 18c family of products, offering customers Premier and Extended Support through to March 2023 and March 2026 respectively. It is available on Linux, Windows, Solaris, HP/UX and AIX platforms as well as the Oracle Cloud. Oracle Database 19c offers customers the best performance, scalability, reliability and security for all their operational and analytical workloads. Some important features of Oracle Database 19c are as follows:

• Automatic Indexing.
• SQL Diagnostics and Repair Enhancements.
• Bitmap Based Count Distinct SQL Function.
• Big Data and Performance Enhancements for In-Memory External Tables.
• Automatic SQL Plan Management.
• Real-Time Statistics.
• High-Frequency Automatic Optimizer Statistics Collection.
• Hybrid Partitioned Tables.

In details from https://iamdbablog.com/2019/10/13/oracle-19c-features/

Installation and Upgrades

RPM Based Installation install Oracle 19c Database using RPM method

Simplified Image based installation of client as well

Auto Upgrade Utility for Oracle Database

Docker Container for Oracle 19c

DryRun mode for GridSetup in clusterware Installation

General

Clear flashback logs from time to time

Passwords removed from user accounts (default accounts)

Flush Metadata Cache for Passwords

Multi-model partitioning with Hybrid partitioning allowing some partitions in database and some as external partitions even in HDFS

New ALTER SYSTEM statement clause FLUSH PASSWORDFILE_METADATA_CACHE

Hybrid Partitioned Tables – to integrate internal partitions and external partitions into a single partition table. partitions to reside in both Oracle Database segments and in external files and sources.

Schema-only accounts – Passwords Removed from Oracle Database Accounts

Database Performance

SQL Quarantine – Using Oracle’s Resource Manager tool is a great way to make sure SQL statements don’t become resource hogs and slow down database performance for everyone. If a statement asks for more system resources than the DBA allows, Resource Manager kills it. However, in existing versions of Oracle Database, nothing stops users from executing problematic SQL statements again. In Oracle 19c, Resource Manager can automatically quarantine the statements; should a user try to issue one again, it won’t run at all.

Automatic Indexing – This new feature puts Oracle’s automation capabilities to work. If Oracle 19c thinks a database table would benefit from an index, the system will automatically create the index and initially mark it as invisible so it can’t be used. Oracle 19c will then run SQL statements from your application to see if the index improves query execution. If the index does help, it will be made visible for application use; if it doesn’t do so, the index will become unusable and eventually be removed. You can control this feature with DBMS_AUTO_INDEX, a new PL/SQL package that’s included in 19c.

SQL Statement Diagnosability with SQL Advisor repair and SQL Test case for procedures

Automatic Database Diagnostic Monitor (ADDM) Support for Pluggable Databases (PDBs)

Realtime statistics for DML Operations – Oracle Database 19c introduces real-time statistics, which extend online support to conventional DML statements

Automatic flashback of standby databases. In prior versions, if DBAs wanted to use Oracle’s flashback features to return a primary database to a previous state, they needed to manually rebuild an associated standby database before it could resume normal operations. In Oracle 19c, a DBA can put the standby database in MOUNT mode with no managed recovery and then flash back the primary one; the standby will also be reverted, thus keeping it in sync with the primary.

Statistics Collection on custom frequency automatically – From 19c onwards, High-frequency automatic optimizer statistics collection complements the standard statistics collection job

Data Pump

Oracle Data Pump Test Mode for Transportable Tablespaces (TTS)

Oracle Data Pump Allows Tablespaces to Stay Read-Only During TTS Import

Oracle Data Pump Import Supports More Object Store Credentials

Oracle Data Pump Ability to Exclude ENCRYPTION Clause on Import – new transform parameter OMIT_ENCRYPTION_CLAUSE

Oracle Data Pump Support for Resource Usage Limitations – new parameter MAX_DATAPUMP_PARALLEL_PER_JOB

Oracle Data Pump Prevents Inadvertent Use of Protected Roles – new ENABLE_SECURE_ROLES parameter is available

Oracle Data Pump Loads Partitioned Table Data One Operation – GROUP_PARTITION_TABLE_DATA, a new value for the Import DATA_OPTIONS command line parameter

Pluggable Databases

Creation Duplicate of an Oracle Database, 

create duplicatedb command, in DBCA silent mode

Ability to relocate a PDB to another CDB Using DBCA in silent mode

Create a PDB by Cloning a Remote PDB Using DBCA in silent mode

ADDM Analysis at PDB Level

Data Guard

Replicate Restore Points from Primary to Standby

Dynamically change Fast-Start Failover (FSFO) target standby database to another standby database in the target list without disabling FSFO.

Re-creation of broker configuration

Propagate Restore Points from Primary to Standby site

DML redirect to standby/ADG for read-mostly applications

Simplified Dataguard broker parameter configurations

Observe Only Mode for Data Guard Broker’s Fast-Start Failover (FSFO)

Oracle Data Guard Multi-Instance Redo Apply Works with the In-Memory Column Store

Finer Granularity Supplemental Logging for logical standby databases

New initialization parameters in Oracle Database 19c

“_optimizer_gather_stats_on_conventional_dml” and “_optimizer_use_stats_on_conventional_dml” which are true by default

_optimizer_stats_on_conventional_dml_sample_rate (at 100%)

DATA_GUARD_MAX_IO_TIME

DATA_GUARD_MAX_LONGIO_TIME

MAX_DATAPUMP_JOBS_PER_PDB