HSQLDB vs Tkrzw
HSQLDB
hsqldb.orgTkrzw
dbmx.netSide by side
| Figure | HSQLDB | Tkrzw |
|---|---|---|
| Price from | $8.33/mo | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | Yes | — |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| API | Yes | — |
| Self-hosted | Yes | Yes |
| Plans published | 11 | 0 |
| Spec score · Embedded Databases | 9.2 (#2) | 6.8 (#26) |
| Concurrency | The engine is multithreaded and offers lock-based, MVCC and hybrid transaction-control models. | The API documentation says all database classes are thread-safe for simultaneous access by multiple threads. |
| License | HSQLDB source and binaries use permissive BSD-based licenses, with separate terms for legacy Hypersonic SQL code. | The project repository identifies the license as Apache-2.0. |
| Support model | Community support is provided through documentation and a SourceForge forum, while SupportWare subscribers receive priority support and feature consideration. | The repository provides contribution instructions and sample code, while the opened project pages do not state a commercial support offering. |
Plans
HSQLDB
- Developer subscription$100 a year
- Basic Corporate subscriptionPrice not published
- Premier Corporate subscription$2,500 a year
- HSQLDBFree
- HSQLDB softwareFree
- Developer SupportWare$100 a year
- SupportWare Developer subscription$100 a year
- Basic Corporate SupportWare$500 a year
- SupportWare Basic Corporate subscription$500 a year
- Premier Corporate SupportWare$2,500 a year
In their own words
HSQLDB
HSQLDB is a Java-based relational database engine for embedded or server use, with both in-memory and disk-based tables. It supports SQL:2023 core features and many optional features, plus lock-based and MVCC transaction models; the engine is fully multithreaded. Listed capabilities include JSON constructor functions, CSV loading and unloading, temporal system-versioned tables, row-level access control, and log-based replica synchronization. It includes a command-line SQL tool and simple GUI query tools. The latest official release listed is version 2.7.4, compatible with JDK 8 and above, and packages include Java 11 module jars as well as Java 8 jars for HSQLDB and SQL Tool. HSQLDB is self-hosted, with high availability, read replicas, and JSON data support listed. Its default combined limit for CACHED tables is 8TB, extendable to 256TB with a connection property; each TEXT table is limited to 256GB, and memory tables depend on available memory. The software is free to use in commercial products when license terms are met; its licenses are based on the new BSD License. The HSQLDB plan is free. A Developer subscription is $100 a year; Premier Corporate is $2,500 a year at the base level. Support options include community channels and paid commercial support.