name: Couchbase Vocabulary
description: >-
  Controlled vocabulary of Couchbase concepts spanning the on-premises Server,
  Capella database-as-a-service, Sync Gateway, and App Services product lines.
url: https://docs.couchbase.com/
version: '1.0'
modified: '2026-04-28'
concepts:
  - name: Cluster
    description: A set of one or more Couchbase Server nodes that work together to provide a scalable database service.
  - name: Node
    description: A single Couchbase Server instance running on a machine or container that hosts one or more services.
  - name: Bucket
    description: A logical container for data in Couchbase Server, analogous to a database, partitioned across nodes.
  - name: Scope
    description: A namespace within a bucket that groups related collections for multi-tenant or modular data design.
  - name: Collection
    description: A container of documents within a scope, similar to a table in a relational database.
  - name: Document
    description: A JSON, binary, or sub-document value stored in Couchbase identified by a unique key.
  - name: Vbucket
    description: A logical partition of data inside a bucket distributed across nodes for horizontal scalability.
  - name: Service
    description: A capability hosted by a Couchbase node such as Data, Query, Index, Search, Analytics, or Eventing.
  - name: SQL++ (N1QL)
    description: Couchbase's SQL-family query language for JSON documents (formerly named N1QL).
  - name: GSI
    description: Global Secondary Index used by the Query service to accelerate predicate-driven queries.
  - name: FTS Index
    description: A full-text search index managed by the Search service supporting fuzzy, faceted, geo, and vector queries.
  - name: Eventing Function
    description: Server-side JavaScript function deployed in the Eventing service that responds to data mutations or timers.
  - name: XDCR
    description: Cross Data Center Replication that asynchronously replicates data between buckets in different clusters.
  - name: Sync Gateway
    description: Middleware that synchronizes documents between Couchbase Server and Couchbase Lite mobile/edge clients.
  - name: Couchbase Lite
    description: Embedded NoSQL database for iOS, Android, .NET, Java, and C that synchronizes via Sync Gateway.
  - name: Capella
    description: Couchbase's fully managed database-as-a-service offering across AWS, Azure, and Google Cloud.
  - name: App Services
    description: Capella's managed service for mobile and edge data sync, equivalent to a cloud-hosted Sync Gateway.
  - name: Backup Service
    description: Couchbase Enterprise service that orchestrates scheduled backup, restore, and repository management.
services:
  - name: Data
    port: 8091
    description: Key-value data service exposed by Couchbase Server.
  - name: Query
    port: 8093
    description: SQL++ query service for ad-hoc and prepared queries.
  - name: Search
    port: 8094
    description: Full-text and vector search service.
  - name: Analytics
    port: 8095
    description: Analytics service for complex SQL++ analytics over operational data.
  - name: Eventing
    port: 8096
    description: Server-side JavaScript eventing service.
  - name: Backup
    port: 8097
    description: Backup service for scheduled backup, restore, and repository management.
  - name: Sync Gateway Public
    port: 4984
    description: Public REST API for mobile and edge clients to sync via Sync Gateway.
  - name: Sync Gateway Admin
    port: 4985
    description: Administrative REST API for configuring Sync Gateway databases, users, and replications.