PouchDB

View Current Viewing Revision #15 from 11/24/2019 11:17 p.m.

PouchDB is a free and open-source JavaScript DBMS inspired by Apache CouchDB (document-oriented NoSQL DBMS) that is designed to run inside a web browser. It was designed with the intention of serving web developers and to run smoothly within a browser. Applications utilize a system where, while offline, data is stored locally, then, when back online, the data is synchronized with Apache CouchDB and between clients. Thus, data is synchronized regardless of login context.

Data Model

Document / XML

PouchDB uses an unstructured document data model, where documents are JSON serializable. It also supports attachments, which store binary data.

Query Interface

Custom API

PouchDB utilizes a custom API for its query interface. As it is designed for web browsers, this API supports callbacks, promises, and async functions.

Checkpoints

Non-Blocking

PouchDB allows users to enable or disable replication checkpoints (which would be modified based on system performance goals and/or usage), which are used for synchronization across the local and remote servers. These checkpoints are non-blocking.

Logging

Shadow Paging

Views

Materialized Views

PouchDB supports creating materialized views of the results of a query. It's very similar to CouchDB however PouchDB uses ASCII ordering to order view query keys. It also does not support the offset property that CouchDB does. Instead, a skip parameter is used instead of an actual offset.