H2 is a Java based Database which will replace Derby as the default database in Payara 5. Derby will be still included with Payara 5 but will no longer be the default database.
Why replace Derby
In terms of performance, Derby is one of the slowest embedded databases as compared to H2, PostgresSQL, HSQLDB. H2 also has a smaller disk footprint; the size of a jar file is around 1.5 MB.
To Start the Database
To start the database run the command below:
Above command will start H2 on the default port, which is 9092. To explicitly start Derby run the command below:
asadmin> start-database --dbtype derby