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About

Welcome to the home page of HeliDB – a simple and fast Java database!

HeliDB is a database for persisting key—value pairs from a Java program. Users have many choices in configuring what capabilities they want the database to have and in how the data is stored. In its simplest configuration, HeliDB is just a file-backed Map. More advanced configurations support transactions and fast searches and inserts through using B+ Trees.

Notable features are:

• The HeliDB Database interface extends Java's Map, so a HeliDB database can be used as a drop-in replacement for a Map.
• The Database interface defines methods that are more efficient for working with persistent data than the methods from Map.
• A database can be configured to support transactions.
• Database operations can be made faster by indexing data in B+ Trees.
• Database object creation is fast, so clients can create new databases as necessary without having to worry about performance.
• The database runs in the same process as the Java program which makes database calls just local function calls. (i.e. fast)

When should I use HeliDB?

HeliDB is a great choice when you want to persist key—value pairs, but don't want to use a full-blown SQL database.

What limitations does HeliDB have?

• Data is stored as key—value pairs. There is no way of searching for data within values (like selecting for data in table columns in an SQL database).
• Transactions don't allow concurrent writes to the same database.

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