What is H2 database used for?
What is H2 database used for?
H2 is a disk-based or in-memory databases and tables, read-only database support, temporary tables. H2 provides transaction support (read committed), 2-phase-commit multiple connections, table level locking. H2 is a cost-based optimizer, using a genetic algorithm for complex queries, zeroadministration.
Is H2 database SQL?
Welcome to H2, the Java SQL database. The main features of H2 are: Very fast, open source, JDBC API. Embedded and server modes; in-memory databases.
What is H2 database vs MySQL?
MySQL is a server – based database – it runs as a separate process from your application, and is commonly used in production deployments. H2 is a lightweight database, which can run entirely in-memory, or with disk storage, either in your application’s process (embedded) or in a separate process.
What is H2 database full form?
He also developed the Java database engine Hypersonic SQL. In 2001, the Hypersonic SQL project was stopped, and the HSQLDB Group was formed to continue work on the Hypersonic SQL code. The name H2 stands for Hypersonic 2, however H2 does not share code with Hypersonic SQL or HSQLDB. H2 is built from scratch.
Is H2 a good database?
As of 2019, H2 is a superb database. We use it in all of our standalone applications since 4 years and we see it minimizes a gap between SQLite and MySQL. It performs as fast as or faster than MySQL.
How do I create a H2 database?
Quickstart
- Add the h2*. jar to the classpath (H2 does not have any dependencies)
- Use the JDBC driver class: org. h2. Driver.
- The database URL jdbc:h2:~/test opens the database test in your user home directory.
- A new database is automatically created.
Why H2 is not used in production?
The main reasons not to use H2 (or HSQLDB, or Derby) for production are: Probability of critical bugs: compared to the ‘big’ databases Oracle, IBM DB 2, MS SQL Server, MySQL, PostgreSQL, the Java databases are relatively new and therefore possibly not as stable (have bugs).
Is H2 database hibernate?
In this Hibernate H2 database tutorial, you will learn how to create a Hibernate Application to connect the H2 in-memory database. Hibernate is an object-relational mapping framework for the Java language. It provides a framework for mapping an object-oriented domain model to a relational database.
Is H2 database in memory?
H2 is an embedded, open-source, and in-memory database. It is a relational database management system written in Java. It is a client/server application. It stores data in memory, not persist the data on disk.
Is H2 faster than MySQL?
Comparing the normalized speed of Hibernate with MySQL database server (0.35) to the normalized speed of Hibernate with H2 database server (6.1) reveals that in that case, Hibernate with H2 server is 17.4 times faster than Hibernate with MySQL server.
Is H2 faster than Postgres?
Absolutely it is faster than PostgreSQL when the work/deployment environment is as specified at the start of this answer. Update operations with H2 are so much faster than PostgreSQL.
Is H2 database persistent?
H2 can be configured to run as an in-memory database, but it can also be persistent, e.g., its data will be stored on disk.