Moving from PostgreSQL to GBase Database (GBase 8c) is not a fork-to-fork migration. GBase 8c uses a proprietary database kernel with PostgreSQL-compatible SQL mode, so the right approach is to validate compatibility before committing to the migration.
PostgreSQL Migration Checklist
1. Audit PostgreSQL Dependencies
Start by identifying PostgreSQL-specific components, including:
pg_catalogdependenciesCustom extensions
Foreign data wrappers
Event triggers
PostgreSQL-specific functions and operators
The goal is to understand what depends on the PostgreSQL ecosystem rather than standard SQL.
2. Test Production SQL
Run your top production queries against a GBase Database (GBase 8c) test environment.
Don't rely on a generic compatibility percentage. Measure your own workload:
SQL execution success rate
Required rewrites
Functional differences
P95 latency
Resource consumption
Production SQL provides a much more useful compatibility baseline than a simple feature checklist.
3. Map Database Configuration
PostgreSQL tuning parameters do not always have direct equivalents.
Review settings related to memory, connections, query execution, and workload management, then map them to the corresponding GBase Database configuration model.
4. Reconsider Data Distribution
This is one of the biggest architectural differences.
A PostgreSQL deployment may rely heavily on single-node table partitioning. With GBase Database (GBase 8c), distributed workloads require careful distribution-key design.
The question changes from "How should I partition this table?" to "How should this data be distributed across nodes?"
5. Review Procedural Code
PL/pgSQL code can often be adapted, but don't assume every procedure will work unchanged.
Review:
Control-flow logic
Exception handling
PostgreSQL-specific functions
Dynamic SQL
Dependency behavior
Test business-critical procedures individually before production migration.
6. Re-Benchmark Under Distributed Execution
Distributed execution can change query plans and access paths.
Compare P95/P99 latency, throughput, concurrency, and resource utilization—not just average query time.
7. Build a Controlled Cutover Plan
Set up initial data migration followed by CDC-based incremental synchronization. Use a controlled dual-run or validation window to compare source and target results before switching production traffic.
What You Gain
A PostgreSQL-to-GBase Database migration can provide more than SQL compatibility.
GBase Database (GBase 8c) is designed for:
Horizontal scale-out
HTAP workloads with columnar storage
Distributed transaction processing
Mixed transactional and analytical workloads
The key lesson: PostgreSQL compatibility gets you started; workload validation and architecture adaptation determine migration success.
If you're evaluating PostgreSQL migration options, what would you test first: SQL compatibility, performance, or distributed architecture?
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