Oracle
PostgreSQL

Oracle to PostgreSQL Converter

Move Oracle workloads to PostgreSQL, Amazon RDS for PostgreSQL, or Amazon Aurora. Schema conversion, type mapping, and optional two-way sync.

Oracle to PostgreSQL conversion is usually a licensing and vendor-freedom decision.

The data copy is the easy part; the technical risk sits in the server-side code and Oracle-only features the application depends on.

What DBConvert does on this path: handles the Oracle move as a repeatable desktop workflow:

  • Reads Oracle schema and table data from Oracle Database, Oracle XE, or Oracle Cloud.
  • Lets you review type mapping and object selection before creating PostgreSQL-compatible tables and rows.
  • Writes to PostgreSQL, Amazon RDS / Aurora, Azure Database for PostgreSQL, Google Cloud SQL, or Supabase.

What it does not do: Oracle packages, PL/SQL procedures, triggers, jobs, advanced partitioning logic, and application SQL are not automatically turned into production-ready PL/pgSQL. Treat server-side code as a rewrite and validation project.

Which tool: DBConvert or DBSync?

DBConvert for Oracle → PostgreSQL

One-time conversion. Use it when the target schema and table data need to move through a desktop wizard with object selection, naming cleanup, and type mapping review.

DBSync for Oracle ↔ PostgreSQL

Repeat synchronization. Use it when Oracle must keep feeding PostgreSQL during a staged cutover, reporting transition, or validation period.

Need more context? Compare DBConvert and DBSync side by side →

How DBConvert handles the Oracle → PostgreSQL differences

Oracle and PostgreSQL differ in numeric precision, sequence handling, Oracle-only storage concepts, LOB types, and procedural code. DBConvert maps most of those differences in the wizard with sensible defaults that you can review or override per table; PL/SQL rewrite is the one item that still needs a human.

NUMBER precision

Maps Oracle NUMBER without precision to PostgreSQL numeric by default; in the type-mapping review you can route primary-key / foreign-key NUMBER columns to bigint for performance, while financial values keep explicit numeric(p,s).

Sequences

Creates equivalent PostgreSQL SEQUENCE objects (or GENERATED ... AS IDENTITY columns) and sets the next value to MAX(id)+1 after the bulk load - so application inserts do not hit duplicate-key errors.

Text, binary, and LOB types

Defaults to VARCHAR2 / NVARCHAR2 → varchar or text, CLOB → text, BLOB / RAW / LONG RAW → bytea, with the source character set normalized to UTF8 on load - overridable per column.

Oracle-only storage concepts

ROWID, UROWID, and BFILE have no PostgreSQL equivalent. DBConvert reports columns that use these types so the schema decision (drop / replace with surrogate / move file storage elsewhere) is explicit, not silent.

Stored procedures, triggers, and procedural code - out of scope

DBConvert's migration covers tables (with their fields, types, defaults, and indexes), views, and foreign keys. PL/SQL packages, procedures, functions, triggers, autonomous transactions, synonyms, materialized views, and dynamic SQL stay in the source and are rewritten manually in PL/pgSQL - Oracle-specific functions (TO_CHAR, TO_DATE, TO_NUMBER, SYSDATE, DUAL) have no direct PostgreSQL equivalent. Typically a small fraction of the schema, but the one item the tool does not handle.

Why teams move Oracle workloads to PostgreSQL

License and vendor control

PostgreSQL is open source and does not impose Oracle-style database license terms. The migration can reduce vendor dependency while keeping a mature relational database engine.

Cloud portability

PostgreSQL targets are available across self-managed servers, Amazon RDS / Aurora, Azure Database for PostgreSQL, Google Cloud SQL, and Supabase. The target platform is easier to standardize across vendors.

Choosing the migration route

Use DBConvert when the migration owner needs a desktop GUI, saved sessions, type-mapping review, and optional DBSync. Use the other routes when the project is specifically open-source scripting, AWS cutover infrastructure, or deep PL/SQL code translation.

Route Where it fits Where it falls short
Ora2Pg open-source CLI The gold-standard open-source path for Oracle → PostgreSQL assessment, generated scripts, and command-line control. Script-first workflow; no saved-session GUI, no type-mapping review UI, no integrated DBSync.
AWS SCT + AWS DMS log-based CDC, AWS-native Destination is Amazon RDS / Aurora PostgreSQL and the cutover needs AWS-native full-load plus change replication. Coupled to AWS endpoints and AWS billing; not useful for mixed on-prem / cloud targets.
Commercial code-conversion specialists PL/SQL → PL/pgSQL Deep PL/SQL rewrite projects with thousands of interdependent packages, procedures, and custom types where automated assessment runs out of road. Enterprise pricing oriented to code-conversion engagements; schema and data transfer with repeat sync are a separate problem.
Online SQL translators A single query or expression that needs dialect translation in a browser. Not a fit for a production Oracle database with schema, data, PL/SQL, validation, and cutover requirements.
DBConvert / DBSync commercial GUI + sync Desktop wizard with saved sessions, object selection, type-mapping review, and optional DBSync jobs to PostgreSQL, Amazon RDS / Aurora PostgreSQL, Azure Database for PostgreSQL, Google Cloud SQL for PostgreSQL, or Supabase. Commercial license; desktop tool (Windows). PL/SQL packages and procedures are still rewrite work.

Supported versions

  • Oracle 10g and later, including Oracle XE and Oracle Cloud
  • No Oracle client or ODBC driver required
  • PostgreSQL 8.x through 17.x
  • Amazon RDS / Aurora for PostgreSQL, Azure Database for PostgreSQL, Google Cloud SQL, Supabase
  • PostgreSQL schemas (public, custom schemas)

Supported in this path

Source Oracle
Target PostgreSQL
Oracle Database Oracle Database XE PostgreSQL Amazon RDS / Aurora for PostgreSQL Azure Database for PostgreSQL Google Cloud SQL for PostgreSQL Supabase
Oracle

All Oracle Tools

Other directions and pairs
PostgreSQL

All PostgreSQL Tools

Migration & sync options

Reverse Conversion

PostgreSQL to Oracle

Using Oracle to PostgreSQL Tools

When launching the DBConvert or DBSync application in GUI mode, it guides you through the steps to start database migration or synchronization:

1

Connect to Oracle source database

Specify the username/password and host/port parameters if your source database requires login credentials.

Connect to Oracle source database from DBConvert

Oracle source

Check client bitness, NLS language / territory, and authentication protocol before conversion. See Oracle troubleshooting notes.

2

Connect to PostgreSQL destination database

Specify parameters for the destination database similar to the source, defining connection settings and username/password pairs.

Connect to PostgreSQL target database from DBConvert

PostgreSQL target

Allow remote access from the DBConvert machine. For local PostgreSQL, configure pg_hba.conf.

More guides for Oracle ↔ PostgreSQL

Next steps: configure, validate, run

After connecting source and target, the remaining steps are the same for every database pair:

  • Configure migration options - pick tables, fields, indices, views.
  • Issue detection - the built-in checker flags integrity problems before migration starts.
  • Execute - commit the job, monitor progress, save the session for reuse.
  • Schedule and CLI - rerun saved sessions on a schedule or from the command line.
Open the full guide

Steps 3-5, software features, command-line mode, scheduler, and system requirements.

See all features