Introducing Datomic

Presented at the Brisbane NoSQL group

Transcript

1. Intro to Datomic Brisbane NoSQL Oct 2014 @lachlanroche
2. Architecture • Peer library • Transactor • Storage service
3. Peer library • Query engine runs in your application • Data access via Storage Service • Submits changes to and accepts updates from Transactor • API for Clojure and JVM languages • REST peers (alpha)
4. Transactor • Transactor is a process • Single Transactor in a system • Processes transactions • Serialized transaction processing • ACID
5. Storage service • Stores immutable values • Dynamo DB, Riak, Cassandra, Couchbase, Infinispan, SQL • Memcached support
6. Data model • Immutable data - facts don’t change • Atomic data - the datom • Minimal schema • Database is a set of datoms, indexed in various ways • Database as a value
7. Datom • {entity, attribute, value, transaction} • Attribute definition is the only schema • Attributes have type, name, cardinality
8. Time • Time is built in • Transactions are ordered • Transactions are first class entities • Can open database at as-at a point in time, including now, or since a point in time, or for a window in time
9. Querying • Datalog • Implicit joins • Queries can include arbitrary functions from your application • Queries can run on db, or application data, or a mix
10. Links • http://www.datomic.com/