LogoLogo
Start Trial
  • Overview
    • What is DeltaStream?
    • Core Concepts
      • Access Control
      • Compute Pools
      • Data Store
      • Database
      • Function
      • Query
      • SQL
      • Visualizing Data Lineage
  • Getting Started
    • Free Trial Quick Start
    • Starting with the Web App
    • Starting with the CLI
  • How do I...?
    • Create and Manage Data Stores
      • Create Data Stores for Streaming Data
      • Explore Data Store and Topic Details
      • Use Multiple Data Stores in Queries
    • Manage Users and User Roles
      • Inviting Users to an Organization
      • Administering Users in your Organization
      • Using the CLI to Manage User Roles
      • Example: Setting Up Custom Roles for Production and Stage
    • Create DeltaStream Objects to Structure Raw Data
    • Use Namespacing for Organizing Data
    • Create and Query Materialized Views
    • Create a Compute Pool to Work with Iceberg
    • Create a Function
    • Secure my Connection to a Data Store
      • Introducing DeltaStream Private Links
      • Creating an AWS Private Link from DeltaStream to your Confluent Kafka Dedicated Cluster
      • Enabling Private Link Connectivity to Confluent Enterprise Cluster and Schema Registry
      • Creating a Private Link from DeltaStream to Amazon MSK
      • Creating a Private Link for RDS Databases
      • Deleting a Private Link
    • Serialize my Data
      • Working with ProtoBuf Serialized Data and DeltaStream Descriptors
      • Working with Avro Serialized Data and Schema Registries
      • Configuring Deserialization Error Handling
  • Integrations
    • Setting up Data Store Integrations
      • AWS S3
      • ClickHouse
      • Confluent Cloud
      • Databricks
      • Iceberg REST Catalog
      • PostgreSQL
      • Snowflake
      • WarpStream
  • Setting up Enterprise Security Integrations
    • Okta SAML Integration
    • Okta SCIM Integration
  • use cases
    • Using an AWS S3 Store as a Source to Feed an MSK Topic
  • Reference
    • Metrics
      • Prometheus Integration
      • Built-In Metrics
      • Custom Metrics in Functions
    • SQL Syntax
      • Data Formats (Serialization)
        • Serializing with JSON
        • Serializing with Primitive Data Types
        • Serializing with Protobuf
      • Data Types
      • Identifiers and Keywords
      • Command
        • ACCEPT INVITATION
        • CAN I
        • COPY DESCRIPTOR_SOURCE
        • COPY FUNCTION_SOURCE
        • DESCRIBE ENTITY
        • DESCRIBE QUERY
        • DESCRIBE QUERY METRICS
        • DESCRIBE QUERY EVENTS
        • DESCRIBE QUERY STATE
        • DESCRIBE RELATION
        • DESCRIBE RELATION COLUMNS
        • DESCRIBE ROLE
        • DESCRIBE SECURITY INTEGRATION
        • DESCRIBE <statement>
        • DESCRIBE STORE
        • DESCRIBE USER
        • GENERATE COLUMNS
        • GENERATE TEMPLATE
        • GRANT OWNERSHIP
        • GRANT PRIVILEGES
        • GRANT ROLE
        • INVITE USER
        • LIST API_TOKENS
        • LIST COMPUTE_POOLS
        • LIST DATABASES
        • LIST DESCRIPTORS
        • LIST DESCRIPTOR_SOURCES
        • LIST ENTITIES
        • LIST FUNCTIONS
        • LIST FUNCTION_SOURCES
        • LIST INVITATIONS
        • LIST METRICS INTEGRATIONS
        • LIST ORGANIZATIONS
        • LIST QUERIES
        • LIST RELATIONS
        • LIST ROLES
        • LIST SCHEMAS
        • LIST SCHEMA_REGISTRIES
        • LIST SECRETS
        • LIST SECURITY INTEGRATIONS
        • LIST STORES
        • LIST USERS
        • PRINT ENTITY
        • REJECT INVITATION
        • REVOKE INVITATION
        • REVOKE PRIVILEGES
        • REVOKE ROLE
        • SET DEFAULT
        • USE
        • START COMPUTE_POOL
        • STOP COMPUTE_POOL
      • DDL
        • ALTER API_TOKEN
        • ALTER SECURITY INTEGRATION
        • CREATE API_TOKEN
        • CREATE CHANGELOG
        • CREATE COMPUTE_POOL
        • CREATE DATABASE
        • CREATE DESCRIPTOR_SOURCE
        • CREATE ENTITY
        • CREATE FUNCTION_SOURCE
        • CREATE FUNCTION
        • CREATE INDEX
        • CREATE METRICS INTEGRATION
        • CREATE ORGANIZATION
        • CREATE ROLE
        • CREATE SCHEMA_REGISTRY
        • CREATE SCHEMA
        • CREATE SECRET
        • CREATE SECURITY INTEGRATION
        • CREATE STORE
        • CREATE STREAM
        • CREATE TABLE
        • DROP API_TOKEN
        • DROP CHANGELOG
        • DROP COMPUTE_POOL
        • DROP DATABASE
        • DROP DESCRIPTOR_SOURCE
        • DROP ENTITY
        • DROP FUNCTION_SOURCE
        • DROP FUNCTION
        • DROP METRICS INTEGRATION
        • DROP RELATION
        • DROP ROLE
        • DROP SCHEMA
        • DROP SCHEMA_REGISTRY
        • DROP SECRET
        • DROP SECURITY INTEGRATION
        • DROP STORE
        • DROP STREAM
        • DROP USER
        • START/STOP COMPUTE_POOL
        • UPDATE COMPUTE_POOL
        • UPDATE ENTITY
        • UPDATE SCHEMA_REGISTRY
        • UPDATE SECRET
        • UPDATE STORE
      • Query
        • APPLICATION
        • Change Data Capture (CDC)
        • CREATE CHANGELOG AS SELECT
        • CREATE STREAM AS SELECT
        • CREATE TABLE AS SELECT
        • Function
          • Built-in Functions
          • Row Metadata Functions
        • INSERT INTO
        • Materialized View
          • CREATE MATERIALIZED VIEW AS
          • SELECT (FROM MATERIALIZED VIEW)
        • Query Name and Version
        • Resume Query
        • RESTART QUERY
        • SELECT
          • FROM
          • JOIN
          • MATCH_RECOGNIZE
          • WITH (Common Table Expression)
        • TERMINATE QUERY
      • Sandbox
        • START SANDBOX
        • DESCRIBE SANDBOX
        • STOP SANDBOX
      • Row Key Definition
    • DeltaStream OpenAPI
      • Deltastream
      • Models
Powered by GitBook
On this page
  • Streaming or Continuous Queries
  • Query on Materialized Views
  1. Overview
  2. Core Concepts

Query

Querying data in DeltaStream -- how you get things done

PreviousFunctionNextSQL

Last updated 27 days ago

There are two main types of queries:

In the DeltaStream UI Query tab, or when , DeltaStream displays only long-running streaming queries. Queries on materialized views are snapshot queries and therefore not long-lived.

Note In DeltaStream, SQL queries that actually process data are just called queries.

Streaming or Continuous Queries

In DeltaStream, a streaming or continuous query does the following:

  1. reads from one or more and/or

  2. processes the data according to the query logic

  3. generates one or more streams or changelogs

Streaming queries are continuous. When you start them they keep running until you explicitly terminate them.

Streaming queries themselves take two forms in DeltaStream:

  1. Persistent streaming (continuous) queries: These queries persist the results in the streaming storage by creating new streams or changelogs.

  2. Interactive streaming (continuous) queries: When you start these queries, they run continuously and stream the results of the query to you.

Streaming queries start in the NEW state. When you run them they transition to the RUNNING state. At this point they process records from the source object(s) and write into the sink object. When a streaming query fails or otherwise stops operating, it displays as an ERRORED state.

The system may automatically restart a query if it detects an underlying problem, such as a network issue. In failure scenarios, DeltaStream restarts queries from the last known state, at which point they proceed to operate normally.

Note You can report back unrecoverable failures either via the DESCRIBE QUERY command or by clicking on the query state in the DeltaStream Web app.

If you terminate a query on your own, DeltaStream considers the query complete and performs system cleanup.

Query on Materialized Views

See for a list of statements that can start a query for processing records within a Data Store.

When you build a in DeltaStream, you can use standard SQL queries to query the content of the view. Unlike continuous queries, queries on materialized views compute and return results based on the content of the view at the time you issue the query. These queries behave like the queries on tables in traditional relational databases.

Query
listing queries with the CLI
Streaming or Continuous Queries
Queries on Materialized Views
streams
changelogs
Materialized View