Introduction
As enterprises modernize their database ecosystems, security and validation have become inseparable pillars of Oracle database management.
With the release of Oracle Database 19c and the cutting-edge Oracle 23ai, organizations now have powerful new tools to enforce security compliance, strengthen authentication, and validate data integrity — all while maintaining performance and availability.
This blog takes a deep dive into the new security enhancements and validation techniques in Oracle 19c and 23ai, highlighting how features like Password Rollover Time, DBMS_DICTIONARY_CHECK, and DataSafe play critical roles in hardening enterprise database environments.
1. The Evolution of Database Security in Oracle
Oracle’s commitment to security has evolved from simple password policies to end-to-end data protection, transparent encryption, and automated compliance auditing.
In 19c and 23ai, this evolution continues with a focus on:
- Reducing password-related downtime
- Enabling smooth credential rotations for large enterprises
- Simplifying compliance with auditing and validation tools
- Enhancing built-in dictionary checks to detect corruption and invalid metadata
2. Password Rollover Time — Smoother Transitions, Stronger Controls
One of the most practical enhancements introduced in Oracle 19c (19.12+) is the PASSWORD_ROLLOVER_TIME attribute.
This feature allows users to connect using both the old and new passwords during a specified rollover period.
Why it matters:
In large enterprise environments where hundreds of applications connect to a database, changing passwords can cause outages. The rollover feature enables a graceful transition by allowing connections with both credentials until all systems are updated.
Key details:
- Configurable range: 1 hour (1/24) to 60 days
- Must be disabled after password transition is complete
- Ideal for application-level credential updates and DevOps automation
Example SQL:
ALTER PROFILE app_user_profile LIMIT PASSWORD_ROLLOVER_TIME 2;
Pro Tip: Use the view DBA_USERS.PASSWORD_CHANGE_DATE to identify when credentials were last updated — a must-have for SOX compliance and audit tracking.
3. Automating Security Audits with Oracle DataSafe
Security doesn’t stop at passwords. Oracle DataSafe, available with Exadata Cloud Service, provides a unified platform for:
- User risk assessment — detects dormant or privileged accounts
- Sensitive data discovery — identifies and masks PII
- Activity auditing — tracks DDL/DML changes
- Security benchmarking — aligns configuration with Oracle and CIS best practices
By integrating DataSafe into your Oracle Cloud or Exadata@Customer environment, you can continuously monitor and automate compliance checks — significantly reducing manual overhead.
4. Database Dictionary Validation — The Hidden Hero
A healthy data dictionary is essential for a stable database. Oracle introduced a comprehensive dictionary integrity validation tool:DBMS_DICTIONARY_CHECK, available from Oracle 19.22+ onwards.
This procedure performs a full consistency check across internal metadata structures, ensuring no corruption, missing dependencies, or invalid object relationships.
Example execution:
SET SERVEROUTPUT ON SIZE UNLIMITED;
EXEC DBMS_DICTIONARY_CHECK.FULL;
The results display each component’s validation status (PASS/FAIL) and timestamps — a crucial diagnostic for pre-upgrade validation or post-recovery verification.
Best practice:
Run this before any major patching, upgrade, or migration activity to guarantee dictionary health.
5. Performance Meets Security: The Exadata Advantage
Oracle Exadata not only enhances performance but also simplifies security management.
Features like Data Encryption (TDE), Audit Vault, and Data Masking are natively licensed under Exadata Cloud@Customer (ExaC@C) configurations.
In Oracle 23ai, performance and security optimization go hand-in-hand with:
- Faster CPU and memory scaling (X11 hardware)
- Node sub-setting for cost efficiency
- Integrated licenses for diagnostic and security packs
- Adaptive CPU allocation to maintain consistent throughput
With these, DBAs can enforce compliance without compromising speed — a balance essential for mission-critical workloads.
6. Strengthening Validation with Advanced Monitoring
Oracle 23ai expands monitoring capabilities through enhanced dictionary views, AWR reporting, and improved DBA_TABLESPACE_USAGE_METRICS visibility.
A refined tablespace monitoring script combining DBA_TABLESPACE_USAGE_METRICS and DBA_LMT_FREE_SPACE provides accurate insights into storage allocation and consumption:
SELECT tablespace_name, ROUND((used_space/tablespace_size)*100, 2) AS USED_PERCENT
FROM DBA_TABLESPACE_USAGE_METRICS;
This helps proactively manage space utilization — preventing outages caused by full tablespaces, while maintaining compliance with data retention policies.
7. End-to-End Security Validation Checklist
Before finalizing any upgrade or rollout, Oracle DBAs should perform these essential checks:
| Validation Step | Tool/Feature | Purpose |
|---|---|---|
| Password Rollover | Profile setting | Smooth password transition |
| Dictionary Health Check | DBMS_DICTIONARY_CHECK | Metadata consistency |
| Sensitive Data Masking | DataSafe | Compliance and privacy |
| Encryption Verification | TDE Wallet | Data security |
| User Audit Logs | Unified Auditing | Track user activity |
| Tablespace Monitoring | AWR & Scripts | Resource control |
| Patch Verification | OPatch lsinventory | Security patching validation |
Running this checklist ensures a fully validated and compliant Oracle database environment, whether on-prem, Exadata, or cloud.
8. Lessons Learned and Best Practices
- Automate wherever possible — leverage DataSafe and scheduled jobs for audits.
- Run DBMS_DICTIONARY_CHECK before every upgrade.
- Enable Password Rollover only for transition windows.
- Validate encryption and audit logs monthly.
- Document validation results — critical for ISO/SOX compliance.
Security is no longer a one-time setup; it’s an ongoing validation process integrated into every stage of your Oracle database lifecycle.
Conclusion
The leap from Oracle 19c to 23ai isn’t just about innovation — it’s about intelligent, continuous security.
By embracing Password Rollover, DBMS_DICTIONARY_CHECK, and DataSafe, enterprises can establish a zero-downtime, compliance-driven ecosystem that keeps databases both performant and protected.
Oracle’s latest releases empower DBAs to shift from reactive management to proactive security validation — ensuring data integrity, regulatory alignment, and operational excellence in the cloud era.
Explore further: Inside Oracle Database 23ai: Proven Upgrade, Migration & Performance Validation Strategies from Real-World Enterprises
