The FROM clause of the query can name tables, views, and materialized views. Collectively these objects areed master tables a replication term or detables a data warehousing term . Materialized views are used to summarize, compute, replicate, and distribute data..The Heterogeneous Services data dictionary views, whose names all begin with the HS_ prefix, can be divided into the following categories: General views. Views used for the transaction service. Views used for the SQL service. Most of the data dictionary views are defined for both cl.es and instances. For most types of .Primary key materialized views are the default type of materialized view. They are updatable if the materialized view was created as part of a materialized view group and FOR UPDATE was specified when defining the materialized view. An updatable materialized view must belong to a materialized view group that has the . - In addition, because all the joins have been resolved at materialized view refresh time, you pay the price of the join once or as often as you refresh your materialized view , rather than each time you select from the materialized view. In addition, with query rewrite enabled, Oracle can optimize a query that .
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