若要详细了解如何计划刷新,请参阅示例或ALTER MATERIALIZED VIEW。 具体化视图只能使用 Pro 或无服务器 SQL 仓库创建或在 Delta Live Tables 管道中创建。 备注 无服务器 Delta Live Tables 管道支持对具体化视图和流式处理表进行的创建和刷新操作。 可以使用目录资源管理器在 UI 中查看有关支持管道的...
Query data from a materialized view,AnalyticDB:This topic describes how to use materialized views in SQL syntax, such as SELECT, INSERT INTO SELECT, and WITH, to improve query performance.
create materialized view V1 with(distribution=hash(a)) as select a, b from dbo.t group by a, b; -- Clear all cache. DBCC DROPCLEANBUFFERS; DBCC freeproccache; -- Check the estimated execution plan in SQL Server Management Studio. It shows the SELECT query is first step (GET operator...
In other words, any base tables or related columns referenced in the defining SQL query of the materialized view must exist and must be valid. Leader node-only functions: CURRENT_SCHEMA, CURRENT_SCHEMAS, HAS_DATABASE_PRIVILEGE, HAS_SCHEMA_PRIVILEGE, HAS_TABLE_PRIVILEGE. You can't use the ...
To learn more about configuring amaterialized view, seeConfigurematerialized viewsinDatabricks SQL. To learn about the complete syntax for creating a materialized view, seeCREATE MATERIALIZED VIEW. To learn about loading data in different formats and from different places, seeLoad data with DLT. ...
Confirm and execute the action in the pop-up window. Confirm drop materialized view dialogue box. 3. Refreshing a Materialized View Materialized views capture a static snapshot of a query result. However, when the underlying data changes, these views become outdated. To update them with the lat...
A Materialized View is a database object that stores the precomputed results of a SQL query, similar to a summary table, allowing for quick data retrieval and analysis in data warehousing applications. AI generated definition based on: Oracle 10g Data Warehousing, 2005 ...
For materialized views defined using Databricks SQL, use the following syntax: SQL Kopiraj REFRESH MATERIALIZED VIEW mv_name FULL For materialized views defined in a DLT pipeline, you can choose to run a full refresh on selected datasets or on all datasets in a pipeline. See Pipeline ...
Example syntax tocreate a materialized view in oracle: CREATEMATERIALIZEDVIEWMV_MY_VIEW REFRESH FASTSTARTWITHSYSDATE NEXTSYSDATE+1 ASSELECT*FROM; Oracle usesmaterialized views to replicate data to non-master sites in a replication environmentand to cache expensive queries in a data warehouse environment...
Syntax create_materialized_view::= Description of the illustration create_materialized_view.eps (scoped_table_ref_constraint::=, physical_properties::=, materialized_view_props::=, physical_attributes_clause::=, create_mv_refresh::=, evaluation_edition_clause::=, query_rewrite_clause::=, subq...