When the difference matters.
Enterprise-grade vs open-source.
Ora2Pg is a respected open-source Perl tool that delivers solid Oracle-to-PostgreSQL conversion for straightforward schemas. On enterprise estates the differences show up in PL/SQL packages, compound triggers, dependency-ordered deployment, and grant cascades. Here is how the two compare in independent testing.
Coverage by category. Measured in independent testing.
Both tools run against the same Oracle-to-PostgreSQL conversion suite, covering DBMS and UTL packages, DDL clauses, PL/SQL constructs, query syntax, and Oracle built-in functions. Each test asserts on token presence in the converted output and checks for residual Oracle syntax. The result is conversion fidelity, not deployment fidelity.
| Category | Trekport | Open-source baseline | Delta |
|---|---|---|---|
| DBMS and UTL packages | Industry leading | Partial | Materially higher |
| DDL clauses | Industry leading | Partial | Materially higher |
| PL/SQL constructs | Industry leading | Partial | Materially higher |
| Query syntax | Comprehensive | Comprehensive | Comparable |
| Built-in functions | Comprehensive | Comprehensive | Comparable |
Independent benchmark methodology: same Oracle SQL fed to each tool, outputs scored against identical assertions, both tools running their default modes. Full benchmark report available on request under evaluation terms.
Real-world deployment fidelity.
Conversion coverage is a starting point. Deployment fidelity is what determines whether the cutover finishes. On a representative enterprise PL/SQL package set deployed to a vanilla PostgreSQL target, Trekport delivered materially higher deployment fidelity than alternative open-source tooling in independent testing.
Trekport lowers PACKAGE SPEC and BODY to schema-plus-functions with state preserved. Open-source tools often emit package output as a single multi-procedure CREATE FUNCTION that PostgreSQL cannot parse cleanly.
REF CURSOR and typed cursor returns translate to PostgreSQL refcursor with correct return-type wiring. Open-source tools commonly emit constructs that need hand-fixing before deployment.
Trekport's deployer applies grants in role-hierarchy order with cascade-aware pre-filtering. Open-source tooling commonly produces a long tail of grant errors that the operator has to triage.
Where open-source converters fall short.
Open-source Oracle converters are respected community projects. They are also two decades old, implemented around regex-based pattern substitution. Three structural limitations matter to anyone migrating an enterprise Oracle estate.
Pattern matching breaks on the long tail. Compound triggers, package-level state, FORALL with SAVE EXCEPTIONS, BULK COLLECT into record types, and qualified package references all require manual review. Trekport parses to an AST and emits structurally guaranteed PL/pgSQL.
Open-source converters export objects in catalog order, not foreign-key dependency order. The standard workaround is to disable referential integrity during load and re-enable after. Trekport runs a 14-phase dependency-ordered deployment that handles foreign keys natively.
Documentation for the leading open-source converter lists GRANT, TRIGGER, FUNCTION, PROCEDURE, TYPE, QUERY, and PACKAGE among the export types that require post-conversion review. Trekport ships these through the engine with classifier-routed diagnostics.
Capability comparison.
| Capability | Trekport | Open-source baseline |
|---|---|---|
| Conversion approach | AST-based | Regex and templates |
| PL/SQL packages | Ships through the engine | Manual review required (per docs) |
| Compound triggers | Supported | Partial |
| BULK COLLECT and FORALL | Set-based translation | Manual |
| Dependency-ordered deployment | 14-phase pipeline | Catalog order, FK manual |
| Iterative retry | Built in | Re-run required |
| Per-object diagnostics | Four-bucket classifier | Single log stream |
| Validation reports | HTML, PDF, JSON | Cost-estimate report |
| Surface | Desktop, CLI, web | CLI, third-party GUI |
| Parallel data transfer | Identical on every platform | Disabled on Windows |
| Install | Signed installer or static binary | Perl plus DBI plus DBD::Oracle |
| License | Commercial, launch pricing soon | GPL, free |
When open-source is still the right call.
For a small schema (under a hundred tables, no PL/SQL) on a team already comfortable with Perl, an open-source converter is a solid free choice. The economics shift toward Trekport at the scales where manual cleanup time dominates the migration budget: PL/SQL heavy estates, dependency-ordered deployments, regulated environments, and any project where calendar time matters more than tool license cost.
Run them both. Decide on output.
Reserve priority access to run Trekport against your own catalog. Evaluation terms and onboarding from a Trekport engineer included when your wave opens.