When a materializedview is fast refreshed, Oracle must examine all of the changes to the mastertable or master materialized view since the last refresh to see if any apply tothe materialized view. Therefore, if any changes were made to the master sincethe last refresh, then a materialized vie...
When a materializedview is fast refreshed, Oracle must examine all of the changes to the mastertable or master materialized view since the last refresh to see if any apply tothe materialized view. Therefore, if any changes were made to the master sincethe last refresh, then a materialized vie...
Oracle Database Data Warehousing Guide for information about the prerequisites that apply to creating data warehousing materialized views Syntax create_materialized_view::= Description of the illustration create_materialized_view.eps (scoped_table_ref_constraint::=, physical_properties::=, materialized...
In Oracle, for example, you can create a materialized view using the following syntax: CREATE MATERIALIZED VIEW view_name BUILD IMMEDIATE REFRESH FAST ON COMMIT AS SELECT column1, column2, ... FROM table1 JOIN table2 WHERE condition; In this syntax, "view_name" is the name of the materia...
Um eine materialisierte Ansicht zu erstellen, musst du die CREATE MATERIALIZED VIEW Syntax verwenden, die sich in den verschiedenen SQL-Datenbanken leicht unterscheidet. Die folgenden Methoden zeigen, wie man materialisierte Ansichten in SQL Server, PostgreSQL und Oracle erstellt. Materialisierte Ans...
The DDL syntax is consistent with PostgreSQL and Oracle. Create materialized views First, you need to decide what kind of materialized view to create according to the characteristics of your query statement. That is not to say, however, that it is best that your materialized view definition is...
Syntax CREATE MATERIALIZED VIEW mv_name [ BACKUP { YES | NO } ] [ table_attributes ] [ AUTO REFRESH { YES | NO } ] AS query Parameters BACKUP A clause that specifies whether the materialized view should be included in automated and manual cluster snapshots. For materialized views tha...
Theparallel_clauselets you change the default degree of parallelism for the materialized view. Note: The syntax of theparallel_clausesupersedes syntax appearing in earlier releases of Oracle. Superseded syntax is still supported for backward compatibility, but may result in slightly different behavior th...
Note how both the old and the new values are stored in the same column, VAL. The OLD_NEW$$ column identifies the value as either an old or a new value. Gotcha - Commas The syntax diagrams for theCREATE MATERIALIZED VIEW LOGcommand indicate a comma is required between each component of ...
This chapter discusses materialized view syntax, its different types of materialized views, and finally tools used for analysis and management of materialized views. A materialized view can be used to create a physical copy of data. The benefit of using the materialized view when reading a data...