Free texas chat without registration - Updating a view in oracle

Materialized views can be used to improve the performance of a variety of queries, including those performing aggregations and transformations of the data.

This allows the work to be done once and used repeatedly by multiple sessions, reducing the total load on the server.

I will describe example where data is populated from DB View through ADF BC EO and updated through another EO connected directly to the table: In order to prevent this error, we need to disable EO based on DB View from data update - it should not submit data to DB and try to update DB View.

updating a view in oracle-76

When a view is created in SQL Server, metadata for the referenced table columns (column name and ordinal position) is persisted in the database.

A materialized view, or snapshot as they were previously known, is a table segment whose contents are periodically refreshed based on a query, either against a local or remote table.

Using materialized views against remote tables is the simplest way to achieve replication of data between sites.

The example code in this article assumes DB1 is the master instance and DB2 is the materialized view site.

Remember, refreshing on commit is a very intensive operation for volatile base tables.

It makes sense to use fast refreshes where possible.UPDATE statements that reference views with INSTEAD OF UPDATE triggers must supply values for all nonnullable view columns referenced in the SET clause.This includes view columns that reference columns in the base table for which input values cannot be specified, such as: column, an error is generated because the values for these columns must be determined by SQL Server.These columns must be included in the UPDATE statement to meet the NOT NULL requirement of the column.However, if the UPDATE statement references a view with an INSTEAD OF UPDATE trigger, the logic defined in the trigger can bypass these columns and avoid the error.INSTEAD OF UPDATE triggers can be defined on a view or table to replace the standard action of the UPDATE statement.

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