(Note that even if a view is updatable, it might not be possible to insert into it, as described elsewhere in this section.) The updatability of views may be affected by the value of the CREATE TABLE t1 (x INTEGER); CREATE TABLE t2 (c INTEGER); CREATE VIEW vmat AS SELECT SUM(x) AS s FROM t1; CREATE VIEW vup AS SELECT * FROM t2; CREATE VIEW vjoin AS SELECT * FROM vmat JOIN vup ON vmat.s=vup.c; Additional discussion and examples follow.Earlier discussion in this section pointed out that a view is not insertable if not all columns are simple column references (for example, if it contains columns that are expressions or composite expressions).You can use materialized views to achieve one or more of the following goals: If one of your goals is to reduce network loads, then you can use materialized views to distribute your corporate database to regional sites.
Oracle uses materialized views (also known as snapshots in prior releases) to replicate data to non-master sites in a replication environment and to cache expensive queries in a data warehouse environment.
This chapter, and this A materialized view is a replica of a target master from a single point in time.
There are also certain other constructs that make a view nonupdatable.
To be more specific, a view is not updatable if it contains any of the following: .
Therefore, if any changes where made to the master since the last refresh, then a materialized view refresh takes some time to apply the changes to the materialized view.
If, however, no changes at all were made to the master since the last refresh of a materialized view, then the materialized view refresh should be very quick.
The subform table (Table2) has the changes commited (saved) for field1.
Oddly enough the subform updates ok but not the Listbox in the main form. It is a shame that Base is still very limited and buggy, but hopefully this will get better in the future.
While multimaster replication also distributes a corporate database among multiple sites, the networking requirements for multimaster replication are greater than those for replicating with materialized views because of the transaction by transaction nature of multimaster replication.