How to Migrate from ParadeDB to Oracle

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How do I migrate data from ParadeDB to Oracle?

Move schemas and data from ParadeDB (PostgreSQL-compatible) to Oracle using dump utilities, SQL translators, and Oracle import tools.

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Description

Table of Contents

Why migrate from ParadeDB to Oracle?

Teams move to Oracle for advanced partitioning, RAC scalability, or corporate standardization. A structured migration avoids downtime and data loss.

What are the high-level steps?

1) Export ParadeDB schema & data. 2) Translate PostgreSQL SQL to Oracle syntax. 3) Create matching objects in Oracle. 4) Load data. 5) Validate and switch traffic.

How do I export ParadeDB objects?

Use the parade_dump (pg_dump compatible) utility with --schema-only and --data-only flags to create portable SQL and CSV files.

Example schema dump

parade_dump -h parade.host -U admin -d ecommerce -F p --schema-only -f ecommerce_schema.sql

Example data dump

parade_dump -h parade.host -U admin -d ecommerce -F c --data-only -f ecommerce_data.dump

How do I translate SQL to Oracle?

Run Ora2Pg with the --type switch to convert tables, sequences, and INSERT statements to Oracle-compatible syntax.

Translation command

ora2pg -i ecommerce_schema.sql -o ecommerce_ora.sql --type TABLE,VIEW,SEQUENCE,INSERT

How do I create objects in Oracle?

Connect with SQL*Plus or SQLcl and execute the converted DDL: @ecommerce_ora.sql. Resolve any remaining incompatibilities (e.g., SERIAL → IDENTITY, TEXT → CLOB).

How do I load data fast?

Use Oracle Data Pump or SQL*Loader with direct path mode. Export ParadeDB data as CSV, then run a control file that maps columns.

SQL*Loader control snippet

LOAD DATA INFILE 'customers.csv' INTO TABLE customers FIELDS TERMINATED BY ',' (id,name,email,created_at)

How do I verify migrated data?

Compare row counts, checksums, and spot-check queries. Example: SELECT COUNT(*) FROM customers; in both systems should match.

How do I switch production traffic?

Freeze ParadeDB writes, run final incremental dump, import, and repoint application connection strings to Oracle. Monitor error logs and performance.

What performance tweaks are required?

Create indexes on foreign keys, gather Oracle statistics: EXEC DBMS_STATS.GATHER_SCHEMA_STATS('ECOMMERCE');. Adjust sequence cache sizes to match ParadeDB’s SERIAL behavior.

Best practices for a smooth migration

• Migrate non-critical schemas first.
• Automate with scripts and CI.
• Keep identical user privileges.
• Test rollback plan.

Why How to Migrate from ParadeDB to Oracle is important

How to Migrate from ParadeDB to Oracle Example Usage


-- ParadeDB query we want in Oracle
SELECT c.name, SUM(oi.quantity * p.price) AS lifetime_value
FROM Customers c
JOIN Orders o       ON o.customer_id = c.id
JOIN OrderItems oi  ON oi.order_id   = o.id
JOIN Products p     ON p.id          = oi.product_id
GROUP BY c.name
HAVING SUM(oi.quantity * p.price) > 500;

-- Oracle after migration (only date trunc change needed)
SELECT c.name,
       SUM(oi.quantity * p.price) AS lifetime_value
FROM Customers c
JOIN Orders o       ON o.customer_id = c.id
JOIN OrderItems oi  ON oi.order_id   = o.id
JOIN Products p     ON p.id          = oi.product_id
GROUP BY c.name
HAVING SUM(oi.quantity * p.price) > 500;

How to Migrate from ParadeDB to Oracle Syntax


-- 1. Dump ParadeDB schema
parade_dump -h <host> -p <port> -U <user> -d ecommerce \
            --schema-only -F p -f ecommerce_schema.sql

-- 2. Dump ParadeDB data in compressed format
a) All tables at once
parade_dump -h <host> -p <port> -U <user> -d ecommerce \
            --data-only -F c -f ecommerce_data.dump

b) Per-table CSV for SQL*Loader
COPY Customers TO 'customers.csv' CSV;
COPY Orders    TO 'orders.csv'    CSV;

-- 3. Translate PostgreSQL SQL to Oracle
ora2pg -i ecommerce_schema.sql \
       -o ecommerce_ora.sql \
       --type TABLE,VIEW,SEQUENCE,INSERT \
       --column_case 1 

-- 4. Create objects in Oracle
sqlplus oracle_user/password@ORCL @ecommerce_ora.sql

-- 5. Bulk-load data with SQL*Loader
sqlldr userid=oracle_user/password@ORCL control=customers.ctl direct=true

-- customers.ctl example (ecommerce context)
LOAD DATA
INFILE 'customers.csv'
INTO TABLE Customers
FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
(id, name, email, created_at DATE "YYYY-MM-DD HH24:MI:SS")

Common Mistakes

Ignoring data type differences. PostgreSQL TEXT maps to Oracle CLOB, SERIAL to IDENTITY. Fix by reviewing ora2pg reports and manually adjusting problematic columns.
Loading data before constraints are disabled. Large tables with FK checks slow down SQL*Loader. Disable constraints, load, then enable and validate.

Frequently Asked Questions (FAQs)

Does Ora2Pg handle PL/pgSQL functions?

It converts basic procedural logic but complex PL/pgSQL may need manual rewrite to PL/SQL. Always review generated .invalid files.

Can I keep sequence values in sync?

Yes. Export SELECT setval('seq',max(id)) from ParadeDB, then run ALTER SEQUENCE seq START WITH <max+1> in Oracle.

How long does the migration take?

Small databases migrate in hours; terabyte-scale systems require staged loads and downtime windows. Run test migrations to estimate.

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