How to Migrate from ParadeDB to MySQL in PostgreSQL

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How do I migrate data from ParadeDB to MySQL without downtime?

Export ParadeDB (Postgres) tables, translate schema, and bulk-load the data into MySQL with minimal downtime.

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Description

Table of Contents

Why migrate from ParadeDB to MySQL?

Teams switch when they need MySQLs replication ecosystem, cloud hosting tiers, or to consolidate databases within an existing LAMP stack.

What prep work is required?

Create a maintenance window, back up ParadeDB with pg_dump, and provision a target MySQL instance with identical character sets and time zones.

How to export ParadeDB data with COPY?

Use COPY to produce clean CSV files per table. Example: COPY (SELECT * FROM customers ORDER BY id) TO '/tmp/customers.csv' WITH (FORMAT CSV, HEADER, DELIMITER ',');

Can I export multiple tables at once?

Use a shell loop or pg_dump --format=plain --data-only --table commands batched per table to keep files small and manageable.

How to create matching tables in MySQL?

Translate Postgres typese.g., serial 1 AUTO_INCREMENT, text 1 LONGTEXT, timestamptz 1 DATETIME. Run CREATE TABLE customers (id INT PRIMARY KEY AUTO_INCREMENT, name VARCHAR(255), email VARCHAR(255), created_at DATETIME);

How to import CSV into MySQL?

Place files in /var/lib/mysql-files, then run LOAD DATA INFILE '/var/lib/mysql-files/customers.csv' INTO TABLE customers FIELDS TERMINATED BY ',' ENCLOSED BY '"' LINES TERMINATED BY '\n' IGNORE 1 LINES;

What about foreign keys?

Disable checks during load: SET FOREIGN_KEY_CHECKS=0; Import child tables after parents, then re-enable.

How to verify and optimize the migration?

Run row counts on both sides, spot-check sample IDs, and create needed indexes. Finally, switch application connections and monitor error logs.

Why How to Migrate from ParadeDB to MySQL in PostgreSQL is important

How to Migrate from ParadeDB to MySQL in PostgreSQL Example Usage


-- Migrate only customers created in the last year
COPY (
  SELECT * FROM customers
  WHERE created_at >= NOW() - INTERVAL '1 year'
) TO '/tmp/customers_recent.csv' WITH (FORMAT CSV, HEADER);

-- MySQL import
LOAD DATA INFILE '/var/lib/mysql-files/customers_recent.csv'
INTO TABLE customers
FIELDS TERMINATED BY ',' ENCLOSED BY '"'
LINES TERMINATED BY '\n' IGNORE 1 LINES;

How to Migrate from ParadeDB to MySQL in PostgreSQL Syntax


-- 1. Export from ParadeDB (Postgres)
COPY (SELECT * FROM customers ORDER BY id)
TO '/tmp/customers.csv'
WITH (
    FORMAT CSV,
    HEADER,
    DELIMITER ',',
    NULL ''
);

-- 2. Create target table in MySQL
a) Drop if exists
DROP TABLE IF EXISTS customers;

b) Create
CREATE TABLE customers (
    id INT PRIMARY KEY AUTO_INCREMENT,
    name VARCHAR(255),
    email VARCHAR(255),
    created_at DATETIME
);

-- 3. Import into MySQL
LOAD DATA INFILE '/var/lib/mysql-files/customers.csv'
INTO TABLE customers
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n'
IGNORE 1 LINES
(id, name, email, created_at);

-- Options
--  * LOCAL keyword if client uploads files.
--  * SET column=value for computed columns.
--  * CHARACTER SET to force encoding.

Common Mistakes

Ignoring data type differences: directly loading a ParadeDB CSV with arrays or JSONB into MySQL fails. Fix by flattening arrays and converting JSONB to LONGTEXT or JSON columns before export.
Leaving foreign key checks enabled during bulk loads: large inserts crawl or fail. Always <code>SET FOREIGN_KEY_CHECKS=0;</code> before <code>LOAD DATA</code> and re-enable afterward.

Frequently Asked Questions (FAQs)

Does COPY keep the data order?

Only if you wrap the export query in an explicit ORDER BY. Otherwise PostgreSQL writes rows in page order.

Can I run exports in parallel?

Yes. Use GNU parallel or separate sessions; just avoid saturating I/O bandwidth.

Whats the safest rollback plan?

Keep ParadeDB read-only until MySQL verification passes, then redirect traffic. You can switch DNS back instantly if needed.

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