QED

QED, the Quadcap Embeddable Database. QED is a fast, small, pure Java, relational database, implementing the SQL 92 standard, with transactions and resilient failure recovery. QED has a novel open source license permitting free use of QED by all and free redistribution in other open source projects.

#-------------------------------------------------------------------
# Database Manager Configuration
#-------------------------------------------------------------------
DatabaseManager.Databases[] = "<database_id>"
DatabaseManager.DefaultDatabase = "<database_id>"
DatabaseManager.Debug = "true"
DatabaseManager.DB.<database_id>.ClassType = "Sybase"
DatabaseManager.DB.<database_id>.JdbcDriver = " com.quadcap.jdbc.JdbcDriver"
DatabaseManager.DB.<database_id>.Connection.Url = " jdbc:qed:<databaseFolderPath>"
DatabaseManager.DB.<database_id>.Connection.User = "<name>"
DatabaseManager.DB.<database_id>.Connection.Password = "<password>"
DatabaseManager.DB.<database_id>.Connection.MaxPoolSize = "2"
DatabaseManager.DB.<database_id>.Connection.AllocationTimeout = "2"
DatabaseManager.DB.<database_id>.Connection.Logging = "true"
DatabaseManager.DB.<database_id>.Connection.MaxPreparedStatements = "2"
DatabaseManager.DB.<database_id>.ObjectId.CacheSize = 2
DatabaseManager.DB.<database_id>.ObjectId.MinValue = 1

Where <databaseFolderPath> is path to folder that represents QED database.

This is the link where you can find all needed information and downloads for Informix database:

http://www.quadcap.com/products/qed/docs/index.html