Updating a view in oracle Older dating sites in th e nud e

-- Normal CREATE MATERIALIZED VIEW view-name BUILD [IMMEDIATE | DEFERRED] REFRESH [FAST | COMPLETE | FORCE ] ON [COMMIT | DEMAND ] updating a view in oracle-81

To take advantage of the of the fast refresh, connect to the master instance and create the materialized view log.

If a materialized view is configured to refresh on commit, you should never need to manually refresh it, unless a rebuild is necessary.

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.

In the inserted table passed to an INSTEAD OF UPDATE trigger, the columns specified in the SET clause follow the same rules as the inserted columns in an INSTEAD OF INSERT trigger.

For columns not specified in the SET clause, the inserted table contains the values as they existed before the UPDATE statement was issued.

For on demand refreshes, you can choose to manually refresh the materialized view or refresh it as part of a refresh group.

The following code creates a refresh group defined to refresh every minute and assigns a materialized view to it.

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.

To reduce the replication costs, materialized view logs can be created to capture all changes to the base table since the last refresh.

Tags: , ,