Question 1

How do I extract a subset of data from MySQL using Jailer?

Accepted Answer

Connect Jailer to your MySQL database via JDBC, use the subsetter to define filters or use 'Subset by Example' in the data browser, then export to formats like SQL or JSON. The tool handles referential integrity automatically based on foreign keys.

Question 2

Jailer vs pg_dump for test data – which is better?

Accepted Answer

Jailer is superior for maintaining referential integrity in subsets, as pg_dump exports entire databases or tables without ensuring consistency. Use Jailer for small, realistic test slices; pg_dump for full backups or simple dumps.

Question 3

Does Jailer support cyclic foreign key dependencies?

Accepted Answer

Yes, the README notes that cycles in parent-child relationships are detected and broken by deferring nullable foreign key insertion, allowing export of such data without integrity violations.

Question 4

Can I use Jailer's API for automated data exports?

Accepted Answer

Yes, an API provides programmatic access to export and import functionality, as mentioned in the 2017 news update. This allows integration into scripts, but it requires Java and might have a steeper learning curve.

Question 5

What are the system requirements for running Jailer?

Accepted Answer

Jailer requires Java and is available via installers for Windows and Linux or a zip file. It's a desktop application, so adequate RAM and CPU are needed for handling large databases, with no specific minimums listed.

Question 6

Is Jailer free for commercial use?

Accepted Answer

Yes, Jailer is open-source with contributors and financial backers, as shown in the README. It's freely available for commercial use under its license, with no mentioned restrictions.

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