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Wisser
Jailer
Java2018–2026
Wisser / Jailer

Jailer

Database Subsetting and Relational Data Browsing Tool.

14Distinct people
24Mentions
0Explicit recommenders
3.2KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

Database Subsetting and Relational Data Browsing Tool.

GitHub

Where it is used

No documented product use was verified in the last source check.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:56:07 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year24 dated mentions

Observed mentions: 2018-01-06 17:37:44 UTC to 2026-06-15 10:12:24 UTC.

02468102018-01-01 00:00:00 UTC to 2019-01-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 comments20182019-01-01 00:00:00 UTC to 2020-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2020-01-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 9 mentions; 6 submissions, 3 comments2022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments20222023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 8 mentions; 5 submissions, 3 comments2024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-01-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2026-01-01 00:00:00 UTC to 2027-01-01 00:00:00 UTC (exclusive): 2 mentions; 2 submissions, 0 comments. Incomplete calendar period.2026*

* An incomplete calendar period is marked with an outlined bar. Its count is not directly comparable with a full period.

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20182018-01-01 00:00:00 UTC2019-01-01 00:00:00 UTC110
20192019-01-01 00:00:00 UTC2020-01-01 00:00:00 UTC000
20202020-01-01 00:00:00 UTC2021-01-01 00:00:00 UTC000
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC963
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC211
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC853
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC101
20252025-01-01 00:00:00 UTC2026-01-01 00:00:00 UTC101
2026 (partial)2026-01-01 00:00:00 UTC2027-01-01 00:00:00 UTC220

What Hacker News says

24 sources
Jailer[0] might be worth a look. From the project's website[1]: Jailer is a tool for database subsetting, schema and data browsing. It creates small slices from your database and lets you navigate through your database following the relationships.. Ideal for creating small samples of test data or for local problem analysis with relevant production data. [0] https://github.com/Wisser/Jailer [1] https://wisser.github.io/Jailer/
In How do you make large databases available to developers?
babayega2·May 17, 2023Submission

Ask HN: What are the open source tools for database subsetting?

I have a very huge Postgres database that I need to clone locally (like 0.01 if its data) and do some tests. I have tried to use Jailer [0] (complicated to use. Like after installing it with the dpkg command, how do we launch it?) or Condenser [1] (intuitive but producing errors). Is there any other open source program to produce a small subset of the data available in a PostgreSQL? Like I like the fact that in Condenser you only tell the config file that you want 1% of the initial data and it does. [0]: https://github.com/Wisser/Jailer [1]: https://github.com/TonicAI/condenser
1 points · Open discussion

Jailer, Database Relational Data Tool

Jailer is a tool for database subsetting and relational data browsing. https://github.com/Wisser/Jailer It creates small slices from your database and lets you navigate through your database following the relationships.Ideal for creating small samples of test data or for local problem analysis with relevant production data. The Subsetter creates small slices from your database (consistent and referentially intact) as SQL (topologically sorted), DbUnit records or XML. Ideal for creating small samples of test data or for local problem analysis with relevant production data. The Data Browser lets you navigate through your database following the relationships (foreign key-based or user-defined) between tables. Features Exports consistent and referentially intact row-sets from your productive database and imports the data into yo
Read the rest
ur development and test environment. Improves database performance by removing and archiving obsolete data without violating integrity. Generates topologically sorted SQL-DML, hierarchically structured XML and DbUnit datasets. Data Browsing. Navigate bidirectionally through the database by following foreign-key-based or user-defined relationships. SQL Console with code completion, syntax highlighting and database metadata visualization. A demo database is included with which you can get a first impression without any configuration effort.
1 points · Open discussion

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