Data

15 items tagged with "data"

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Patterns15

Mediates between the domain and data mapping layers via a collection-like interface for accessing domain objects, hiding persistence details.

Tracks objects affected by a business transaction and coordinates writing out changes and resolving concurrency as a single commit.

Moves data between objects and a database while keeping them independent, so domain objects carry no persistence knowledge.

Wraps a database row in an object that carries both the data and the methods to load, save, and delete itself.

Models a concept defined by its attributes rather than identity, making it immutable and compared by value to keep the domain expressive and safe.

Captures something significant that happened in the domain as an explicit object, decoupling the trigger from the reactions to it.

Implements a query that spans multiple services by invoking each owner service and joining the results in memory.

Separates the model that writes data (commands) from the model that reads it (queries) so each can be optimized independently.

Reliably publishes messages by writing them to an outbox table in the same local transaction as the business data change.

Captures row-level changes from a database's transaction log and streams them as events to downstream consumers.

Distributes keys across nodes so that adding or removing a node remaps only a small fraction of keys.

Horizontally partitions a data store into independent shards so capacity and load scale beyond a single node.

Undo the completed steps of a multi-step operation when one step fails, restoring consistency without distributed ACID transactions.

Create secondary index tables over data stores queried by non-key fields to speed up lookups that would otherwise scan.

Precompute and store read-optimized views of data so expensive queries become fast lookups against ready-made results.