RheoData Blog | GoldenGate migration sizing

Why Two Assessment Tools Are Better Than One Here's what I've learned after helping hundreds of organizations plan their Oracle cloud migrations: the question isn't whether to use Oracle's Cloud Premigration Advisor Tool (CPAT) or RheoData's Oracle Migration Assessment (OMA). The real question is how to use both tools together to create migration projects that succeed on time and on budget. Let me show you exactly what each tool does, where they excel, and why your migration strategy needs both. Understanding Oracle CPAT: The Compatibility Validator Oracle's Cloud Premigration Advisor Tool exists to answer one critical question: Can this database migrate to the cloud? CPAT performs deep compatibility analysis against specific Oracle Cloud targets—Autonomous Database Shared (ADB-S), Autonomous Database Dedicated (ADB-D), and Exadata Cloud Service. Think of CPAT as your migration feasibility checker. What CPAT Does Best Comprehensive Compatibility Checking CPAT runs 88+ specific validation checks against your source database. It identifies unsupported objects, restricted packages, incompatible parameters, and character set issues before they become migration blockers. Automated Remediation When CPAT finds compatibility issues, it doesn't just report them—it generates SQL remediation scripts. Your team gets actionable fixes, not just a list of problems. Target-Specific Validation CPAT tailors its analysis based on your chosen migration destination. The checks for ADB-S differ from ADB-D, and CPAT knows exactly what each target supports. Clear Readiness Scoring You get a straightforward pass/fail migration readiness score. No ambiguity. You'll know if you need to take action before proceeding. Understanding RheoData OMA: The Operational Intelligence Engine RheoData's Oracle Migration Assessment (OMA) tool answers the questions CPAT can't: What resources does this database need, and how should we plan the migration? OMA analyzes 30 days of actual workload performance to provide the operational intelligence that turns a technically feasible migration into a financially successful one. What OMA Does Best Performance Baseline & Trending OMA extracts 30 days of historical AWR data to establish accurate baselines for CPU, memory, I/O, and transaction volumes. You'll right-size your cloud infrastructure instead of guessing or over-provisioning. Capacity Growth Projections The tool uses algorithmic analysis to predict storage requirements at 30, 60, and 90 days. You'll know what your storage costs will look like before you migrate. GoldenGate Trail File Sizing Planning a zero-downtime migration? OMA calculates trail storage requirements based on actual redo generation rates. No surprises when you're trying to maintain replication during cutover. Workload Characterization Session concurrency heatmaps, transaction profiling, and I/O segment analysis give you the complete picture of how your application actually uses the database. You'll identify optimal maintenance windows and potential bottlenecks before migration. AI-Ready Output OMA produces structured JSON with summary layers optimized for LLM consumption. Your team can integrate OMA data with AI-assisted analysis tools for automated insights and recommendations. Side-by-Side Comparison Let's look at how these tools complement each other: Capability Oracle CPAT RheoData OMA Why It Matters Compatibility Validation ✓ 88+ checks Limited (16 checks) CPAT prevents migration blockers Performance Baseline ✗ None ✓ 30-day AWR analysis OMA enables accurate sizing Capacity Projections ✗ None ✓ 30/60/90-day forecasts OMA predicts future costs GoldenGate Sizing ✗ Basic checks only ✓ Trail file calculator OMA plans zero-downtime migrations Automated Remediation ✓ SQL scripts ✗ None CPAT accelerates fixes Workload Profiling ✗ None ✓ Comprehensive OMA characterizes applications Target Cloud Validation ✓ ADB-S/ADB-D/Exadata ✗ No target-specific checks CPAT validates specific destinations Character Set Analysis ✓ NLS/Unicode ✓ NLS/Unicode CPAT prevents data corruption Cost Optimization ✗ None ✓ Growth-based sizing OMA prevents over-provisioning The Three-Phase Migration Assessment Strategy Here's how to use both tools together for maximum success: Phase 1: Discovery & Sizing (Use OMA) Start with RheoData OMA to understand what you're actually working with: Establish 30-day performance baselines Generate capacity projections for budget planning Size GoldenGate trail storage requirements Profile workload characteristics and identify peak usage patterns Create AI-ready output for automated analysis Deliverable: Right-sized target infrastructure specifications with predictable cost forecasts. Phase 2: Validation & Remediation (Use CPAT) Run Oracle CPAT against your source database to validate compatibility: Execute 88+ compatibility checks Generate pass/fail readiness score Produce automated remediation scripts Validate parameters against target cloud environment Check character set compatibility Deliverable: Complete list of migration blockers with actionable remediation plans. Phase 3: Execute with Confidence Combine insights from both tools: From OMA: Right-sized resources, optimal migration timing, accurate cost projections From CPAT: Known compatibility requirements, remediation scripts ready Result: Migrations that complete on time, on budget, with no technical surprises When to Use Each Tool Use OMA When You Need To: Right-size cloud infrastructure and avoid over-provisioning Predict storage costs before committing to migration Plan zero-downtime migrations with GoldenGate Identify optimal maintenance windows Understand actual workload characteristics Create data-driven business cases for migration Use CPAT When You Need To: Validate migration feasibility to specific Oracle Cloud targets Identify schema objects that won't migrate Generate remediation scripts for compatibility issues Check character set and NLS compatibility Validate initialization parameters Produce official Oracle-validated readiness scores Use Both When You Need To: Succeed. Every complex Oracle migration benefits from the combination of operational intelligence (OMA) and compatibility validation (CPAT). The Bottom Line: Better Together I've seen too many migrations fail because teams focused solely on Can we migrate? without asking How should we migrate? I've also seen organizations waste money on over-provisioned cloud resources because they sized based on peak capacity instead of actual growth trends. Oracle CPAT validates that your migration is technically possible. RheoData OMA ensures that your migration is financially smart and operationally sound. Here's my recommendation: 1. Start with OMA to understand your workload and size your target environment correctly. 2. Then run CPAT to validate compatibility and generate remediation plans. Together, these tools provide the most comprehensive pre-migration assessment available. Your migration doesn't have to be a gamble. With the right assessment strategy, it becomes a well-planned journey with a known destination, a clear path, and predictable costs. That's how you turn migration projects into migration successes. Ready to assess your Oracle migration? Contact our team to discuss how RheoData OMA and Oracle CPAT can work together to ensure your migration succeeds the first time.

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