MapDB
H2
Our great sponsors
| MapDB | H2 | |
|---|---|---|
| 2 | 7 | |
| 4,543 | 3,399 | |
| - | 1.6% | |
| 0.0 | 9.4 | |
| 9 months ago | 3 days ago | |
| Java | Java | |
| Apache License 2.0 | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
MapDB
-
Ask HN: What are the best key-value self-hosted storage engines?
In Java I like
It is more feature rich than you want but in Python I'd probably just use sqlite3 since it is in the standard library.
-
Solution for hash-map with >100M values
I have had good results with mapdb
H2
-
Database of Databases
H2 - Free, Embedded & Open source
-
🎀 Spring Boot 2.7.0 Released
H2 2.1
-
How is the market for Kotlin developers where you live?
H2 for mocking relational database connections
- Ask HN: Who wants to be hired? (December 2021)
-
Best Database option for a Swing application
It's open-source and written in Java, so you can even create custom procedures and register them straight in your application!
-
Reliable WebSockets-based pub/sub with Spring Boot
Firstly, let's set up a basic Spring Boot application. We can use the Spring Initializr with Spring Data JPA, H2 Database, Lombok added. H2 Database will provide us with a simple database, and Spring Data JPA will allow us to easily interact with it using Hibernate. Lombok will make it easier to write concise and readable classes.
-
Why are tar.xz files 15x smaller when using Python's tar compared to macOS tar?
Sorting chunks by similarity: commonly used tools don't do that. Most archive tools only sort by file type.
I wrote a tool that chunks the data (into variable-sized blocks, to re-sync if there are multiple files that have different length prefixes, but that's another story), and then sorts the chunks by LSH (locality sensitive hash). LSH is used by search engines to detect similar text. It can compress directories that contain multiple version of e.g. source code very well (e.g. trunk, branches). https://github.com/h2database/h2database/blob/master/h2/src/...
I discussed this approach with a researcher in this area in January 2020. AFAIK there is active research in this area, specially to compress DNA sequences. But he also wasn't aware of papers or research in this area for general-purpose data compression.
So, I think this area is largely uncharted. I would be interested (as a hobby side project) to help, if somebody is interested.
What are some alternatives?
Chronicle Map - Replicate your Key Value Store across your network, with consistency, persistance and performance.
Redisson - Redisson - Redis Java client with features of In-Memory Data Grid. Over 50 Redis based Java objects and services: Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Publish / Subscribe, Bloom filter, Spring Cache, Tomcat, Scheduler, JCache API, Hibernate, MyBatis, RPC, local cache ...
JetBrains Xodus - Transactional schema-less embedded database used by JetBrains YouTrack and JetBrains Hub.
MariaDB4j - MariaDB Embedded in Java JAR
HikariCP - 光 HikariCP・A solid, high-performance, JDBC connection pool at last.
Exposed - Kotlin SQL Framework
Jedis - Redis Java client designed for performance and ease of use.
Flyway - Flyway by Redgate • Database Migrations Made Easy.
SQLDelight - SQLDelight - Generates typesafe Kotlin APIs from SQL
DBFlow - A blazing fast, powerful, and very simple ORM android database library that writes database code for you.