materialized view status, data warehousing, oltp

1. Dr. Girija Narasimhan
PART 24
Materialized view
Status

2. Whenever materialized view and base table data’s are
synchronized then it is considered that materialized view has
fresh data otherwise it has the stale data (out-of-date data).
For knowing the status of materialized view data, there is
three types of view are available namely DBA_MVEIWS,
ALL_MVIEWS, and USER_MVIEWS in the data dictionary.
In the data dictionary the columns of the all the three views
such as MVIEW_NAEM, STALNESS, LAST_REF,
COMPILE_STATE are status are maintain automatically.

3. The STALENESS column display any one value like FRESH, STALE,
UNUSABLE, UNKNOWN, UNDEFINED or NEEDS_COMPILE.
Whenever NEEDS_COMPILE in these views shows NEEDS_COMPILE
OR VALID status. Suppose the STALENESS column value has
NEEDS_COMPILE then issue following alter materialized view
statement for compile.