Data Migration

Database Migration Services — Zero Data Loss, Minimal Downtime

Database migration is the highest-risk component of any cloud move — your data is your business. Opsio migrates Oracle, SQL Server, MySQL, and PostgreSQL to cloud-managed databases with continuous replication, tested rollback, and zero data loss across 1,000+ completed migrations.

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Trusted by 100+ organisations across 6 countries

Data Loss

1000+

DB Migrations

<1h

Cutover

Multi-DB

Expert

AWS DMS

Azure DMS

Cloud SQL

Oracle

PostgreSQL

Aurora

Part of Cloud Solutions

What is Database Migration Services?

A database migration service is a managed capability that transfers relational, NoSQL, and data warehouse workloads from on-premises or legacy environments to cloud-managed database platforms with minimal downtime and verified data integrity. Standard scope covers six core responsibilities: homogeneous migrations such as SQL Server to Azure SQL and heterogeneous migrations such as Oracle to PostgreSQL or MySQL to Aurora; continuous replication that keeps source and target databases synchronized throughout the cutover window; automated schema and code conversion using tools like AWS DMS Schema Conversion, AWS SCT, and the SQL Server Migration Assistant; pre- and post-migration validation to confirm row counts, referential integrity, and application compatibility; tested rollback procedures that allow reversion to the source system if cutover criteria are not met; and ongoing performance tuning of the target instance after promotion. The leading vendor toolchain includes AWS Database Migration Service with DMS Fleet Advisor for discovery, Google Cloud Database Migration Service for serverless MySQL and PostgreSQL transfers, Azure Database Migration Service in both standard and premium tiers for online continuous migrations, and OCI Database Migration for Oracle and MySQL workloads. Pricing for managed migration tooling varies by data volume and replication hours, with AWS DMS replication instances starting under one hundred dollars per month for small workloads and scaling with instance class and data transfer. Opsio holds AWS Advanced Tier Services Partner status with AWS Migration Competency, Microsoft Partner, and Google Cloud Partner credentials, giving mid-market and Nordic enterprise clients access to 50-plus certified engineers, a 24/7 NOC, ISO 27001-certified delivery from the Bangalore centre, and a 99.9% uptime SLA across more than 3,000 projects completed since 2022.

Database Migration Without the Risk

Database migration is the highest-risk component of any cloud move because your data is irreplaceable. Extended downtime means lost revenue, data loss means destroyed customer trust, and a failed database migration can set your entire cloud initiative back by months. Organizations need a partner with proven methodology and deep expertise across every major database platform to execute safely. Opsio specializes in database migration using cloud-native tools: AWS Database Migration Service (DMS), Azure Database Migration Service, and GCP Database Migration Service. We support homogeneous migrations like Oracle to Oracle on RDS and heterogeneous migrations like Oracle to Aurora PostgreSQL, SQL Server to Azure SQL, or MySQL to Cloud SQL — with schema conversion and continuous replication.

Every database migration follows our proven methodology: comprehensive assessment with compatibility analysis, schema conversion with stored procedure translation, continuous replication setup with real-time data validation, performance benchmarking against production baselines, and coordinated cutover with tested rollback procedures — achieving near-zero downtime for even the most critical databases.

Heterogeneous database migration — changing the database engine during migration — delivers significant benefits: Oracle to Aurora PostgreSQL eliminates Oracle licensing costs ($50,000-$500,000+ annually), SQL Server to Cloud SQL reduces licensing overhead, and proprietary database features are replaced with cloud-native equivalents that auto-scale and self-manage.

Common database migration challenges: stored procedures with vendor-specific syntax requiring manual conversion, large databases (1TB+) that take days to replicate initially, applications with hard-coded connection strings and driver dependencies, zero-tolerance for data loss in financial and healthcare systems, and political resistance from DBAs who fear losing their roles.

Evaluating database migration services cost? Assessment runs $3,000-$8,000. Simple homogeneous migration costs $10,000-$25,000. Heterogeneous migration with schema conversion ranges from $15,000-$40,000. Multi-database programs are scoped individually. The ongoing savings from eliminating legacy database licensing typically provide ROI within 6-12 months. Featured reading from our knowledge base: We Enable Cloud Migration Healthcare Data with Minimal Disruption, Database Migration: A Complete Pillar Guide to Secure and Scalable Data Transformation, and Azure Data Migration from On Premise to Cloud: Expert Guidance. Related Opsio services: AWS Migration Services — MAP Funded, Zero-Downtime, Azure Migration Services — Microsoft-Native, Zero-Downtime, GCP Migration Services — Built for Data & AI Workloads, and AWS Cloud Migration Consulting — Plan & Execute.

Migration AssessmentData Migration

Schema ConversionData Migration

Continuous ReplicationData Migration

Performance ValidationData Migration

Coordinated CutoverData Migration

Post-Migration OptimizationData Migration

AWS DMSData Migration

Azure DMSData Migration

Cloud SQLData Migration

Migration AssessmentData Migration

Schema ConversionData Migration

Continuous ReplicationData Migration

Performance ValidationData Migration

Coordinated CutoverData Migration

Post-Migration OptimizationData Migration

AWS DMSData Migration

Azure DMSData Migration

Cloud SQLData Migration

How Opsio Compares

Capability	DIY Migration	System Integrator	Opsio
Database platforms supported	Primary platform only	2-3 platforms	All major platforms — Oracle, SQL Server, MySQL, PG
Schema conversion depth	Automated tools only	Basic manual fixes	Full — stored procedures, triggers, views
Downtime during cutover	Hours to days	1-4 hours	15-60 minutes typical
Rollback capability	Manual, untested	Documented	Rehearsed + tested before cutover
Performance validation	Post-cutover discovery	Basic testing	Full benchmark before cutover
Data validation	Row counts only	Sample checks	Checksums + referential + application testing
Typical cost (single large DB)	$50K+ (hidden labor)	$30-60K	$15-40K (fixed price)

Service Deliverables

Migration Assessment

Analyze source databases for size, complexity, dependencies, performance requirements, and target platform compatibility. We use AWS Schema Conversion Tool, Azure Data Migration Assistant, and manual analysis to identify conversion challenges and estimate effort with detailed reports per database.

Schema Conversion

Convert database schemas between platforms: Oracle PL/SQL to PostgreSQL PL/pgSQL, SQL Server T-SQL to MySQL, proprietary functions to cloud-native equivalents. Opsio handles stored procedures, triggers, views, materialized views, and platform-specific features that automated tools miss.

Continuous Replication

Set up continuous data replication from source to target using AWS DMS, Azure DMS, or native logical replication. Changes sync in real-time while your source database remains fully operational — enabling thorough testing and validation before the final cutover window.

Performance Validation

Before cutover, we validate query performance against production baselines, verify index effectiveness on the target platform, test application compatibility with realistic workloads, and benchmark throughput to ensure no degradation after migration — preventing post-migration performance surprises.

Coordinated Cutover

Planned cutover with tight maintenance windows: application connection string updates, DNS switching, transaction log synchronization, final data validation, and immediate rollback capability if any threshold is breached. Every step is documented and rehearsed before the actual cutover.

Post-Migration Optimization

Query tuning for the target database engine, index optimization based on actual workload patterns, connection pooling configuration, parameter group tuning, read replica setup for scaling, and monitoring with CloudWatch, Azure Monitor, or Cloud Monitoring for ongoing performance.

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What You Get

Database inventory with dependency mapping and compatibility assessment

Schema conversion report with complexity analysis per database

Detailed migration runbook with rollback and validation procedures

Continuous data replication setup with change data capture monitoring

Zero-downtime cutover execution with application connection switching

Post-migration data integrity validation report with checksums

Performance benchmark comparison report — pre and post migration

30-day hypercare support with query optimization

Stored procedure conversion documentation with test results

Knowledge transfer to DBA team with target platform training

“Our AWS migration has been a journey that started many years ago, resulting in the consolidation of all our products and services in the cloud. Opsio, our AWS Migration Partner, has been instrumental in helping us assess, mobilize, and migrate to the platform, and we're incredibly grateful for their support at every step.”

Roxana Diaconescu

CTO, SilverRail Technologies

Pricing & Investment Tiers

Transparent pricing. No hidden fees. Scope-based quotes.

Database Assessment

$3,000–$8,000

Schema analysis + migration plan

Why Choose Opsio for Cloud Services

1,000+ database migrations

Deep experience across every major platform, migration scenario, and complexity level.

Zero-downtime methodology

Continuous replication enables cutover with minimal interruption — typically under 60 minutes.

Heterogeneous expertise

Oracle to Aurora, SQL Server to PostgreSQL, MySQL to Cloud SQL — complex platform changes.

Schema conversion

Stored procedures, functions, triggers, and views converted and validated between platforms.

Performance guaranteed

Benchmarking and validation before cutover — no post-migration surprises.

Rollback tested

Every migration has a rehearsed rollback plan ready to execute instantly.

Not sure yet? Start with a pilot.

Begin with a focused 2-week assessment. See real results before committing to a full engagement. If you proceed, the pilot cost is credited toward your project.

Start a Pilot

Our 4-Phase Delivery Process

Assessment

Source database analysis, target platform selection, compatibility evaluation, and schema conversion complexity estimation with effort breakdown. Timeline: 1-2 weeks.

Preparation

Schema conversion with stored procedure translation, replication setup, and full test migration execution with data validation and performance benchmarking. Timeline: 2-4 weeks.

Migration

Continuous replication activation, comprehensive performance validation against baselines, and coordinated cutover with tested rollback procedures. Timeline: 1-4 weeks.

Optimization

Query tuning for target engine, index optimization, connection pooling, monitoring setup, and knowledge transfer to your DBA team. Timeline: 1-2 weeks.

Key Takeaways

Migration Assessment
Schema Conversion
Continuous Replication
Performance Validation
Coordinated Cutover

Industries Served by Opsio

Enterprise

Large Oracle and SQL Server migrations to managed cloud databases at scale.

SaaS

Multi-tenant database migration with zero customer impact and performance validation.

Financial Services

Transaction-critical database migration with audit compliance and data validation.

Healthcare

HIPAA-compliant database migration with encryption and access control throughout.

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Database Migration Services — Zero Data Loss, Minimal Downtime — FAQ

Can you migrate Oracle to PostgreSQL?

Yes. Oracle to Aurora PostgreSQL (or Cloud SQL PostgreSQL) is one of our most common database migration engagements. We use AWS Schema Conversion Tool or ora2pg for schema conversion, then AWS DMS or native logical replication for continuous data replication. We convert PL/SQL stored procedures, functions, triggers, sequences, and materialized views to PostgreSQL equivalents with thorough testing. Organizations typically save $50,000-$500,000 annually in Oracle licensing costs after migration, making this one of the highest-ROI database modernization paths available.

How long does database migration take?

Small databases under 100GB: 2-3 weeks. Medium databases between 100GB and 1TB: 3-6 weeks. Large databases over 1TB: 6-10 weeks. Very large databases over 5TB: 8-16 weeks. Timeline includes assessment, schema conversion, replication setup, performance validation, and coordinated cutover — not just the data transfer portion of the migration. We provide detailed project plans after assessment with milestone-level granularity, and initial data synchronization runs in parallel with schema conversion work to maximize timeline efficiency.

Will there be downtime during migration?

We achieve near-zero downtime using continuous replication that keeps source and target synchronized in real-time. The actual cutover window — when we switch application connections from source to target — is typically 15-60 minutes depending on database size and transaction volume. Applications experience a brief maintenance window, not extended downtime. Before the actual cutover, we conduct multiple test cutovers that validate the entire process end-to-end, measure actual switchover timing, and verify application functionality so the final cutover is a well-rehearsed procedure.

How much does database migration cost?

Assessment: $3,000-$8,000. Simple homogeneous migration (same engine): $10,000-$25,000. Heterogeneous migration with schema conversion (e.g., Oracle to Aurora): $15,000-$40,000. Multi-database programs with different platforms: scoped after assessment. We provide fixed-price quotes with detailed scope and timeline after evaluation. For heterogeneous migrations that eliminate proprietary database licensing, the ongoing savings typically recover the entire migration investment within six to twelve months, making it one of the most financially compelling infrastructure modernization investments.

What database platforms do you support?

Source platforms: Oracle, SQL Server, MySQL, PostgreSQL, MongoDB, MariaDB, and DB2. Target platforms: AWS Aurora, RDS, DynamoDB; Azure SQL Database, SQL Managed Instance, Cosmos DB; Google Cloud SQL, AlloyDB, Spanner. Opsio handles both homogeneous (same engine) and heterogeneous (different engine) migrations across any combination. Our platform breadth means we can recommend the optimal target database based on your access patterns, performance requirements, and cost objectives rather than being limited to a single cloud provider's offerings.

How do you handle stored procedure conversion?

Stored procedure conversion is the most complex part of heterogeneous migration. We use automated tools (AWS SCT, ora2pg) for initial conversion, then manually review and fix incompatible constructs. Oracle-specific features like packages, autonomous transactions, and bulk collect require manual PostgreSQL equivalents. Every converted procedure is unit-tested against expected results. We maintain a library of conversion patterns from hundreds of previous migrations that accelerates the process and reduces risk, as most Oracle-to-PostgreSQL conversion challenges follow well-documented patterns we have solved before.

What if the migration fails?

Every migration has a tested rollback plan. During continuous replication, the source database remains unchanged and fully operational. If cutover validation fails — wrong row counts, performance degradation, application errors — we execute rollback within the cutover window, reverting to the source database with zero data loss. We define rollback criteria upfront and rehearse the rollback procedure during test migrations. Because the source database remains untouched until final confirmation, rollback is simply a matter of redirecting application connections back to the original system.

Can you migrate to DynamoDB or Cosmos DB?

Yes. We migrate relational databases to NoSQL platforms when the access patterns justify it. This requires data model redesign — transforming normalized relational schemas into denormalized key-value or document models optimized for the target platform's query patterns. We assess whether NoSQL migration makes sense during the assessment phase by analyzing your actual query patterns and access frequencies. Not every relational database benefits from NoSQL migration, so we provide honest recommendations based on data rather than technology trends.

How do you validate data integrity after migration?

We validate data integrity at multiple stages: row count comparison per table, checksum validation for critical tables, sample data comparison for complex data types, referential integrity verification, and application-level testing with realistic workloads. Validation runs during test migrations and again during the actual cutover before we confirm the migration as complete. For financial and healthcare databases where data accuracy is critical, we implement additional validation layers including transaction-level reconciliation and audit trail verification to meet regulatory requirements.

Do you provide ongoing database management after migration?

Yes. We offer managed database services after migration — performance monitoring, query optimization, backup management, version upgrades, failover testing, and capacity planning. The same team that migrated your databases manages them, providing deep knowledge of your schema, query patterns, and application requirements. Ongoing management ensures your databases stay optimized as data volumes grow and query patterns evolve, preventing the performance degradation that commonly occurs when migrated databases are left unmanaged after the initial migration project completes.

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Editorial standards: Written by certified cloud practitioners. Peer-reviewed by our engineering team. Updated quarterly.