Simplified connection strings for SQL*Plus and other clients. to get started, or are you a looking for specific upgrade instructions? The Optimizer in Oracle Database 19c

Yes. Download the "Oracle Database New Features Guide 19c" PDF. Chapter 4, "SQL and JSON," lists every new or enhanced SQL clause introduced since 18c.

Ensure you are downloading PDFs dated within the last 12 months, focus on the version-specific improvements like JSON duality and automatic indexing, and complement your reading with hands-on practice in Oracle LiveSQL. By doing so, you transform static documentation into dynamic skill.

Oracle Database 19c serves as the release for the 12.2 family, providing stability and innovation until at least 2026 . It introduced a shift toward "Autonomous" database operations, where machine learning (ML) handles complex tuning and optimization tasks that previously required manual intervention. Core SQL and Language Enhancements

Oracle 19c introduces Hybrid Partitioning, a feature that fundamentally changes how SQL interacts with storage.

New features include JSON_MERGEPATCH for partial updates, JSON_SERIALIZE for data formatting, and GeoJSON support. Performance & Automation New Features in Oracle Database 19c | PDF - Scribd

The LISTAGG function now supports the DISTINCT keyword, making it easier to aggregate unique strings without complex subqueries.