3. Materialized view related operations
This type of operation is related to the path and method of accessing materialized view data in the SQL statement execution plan, mainly including operations related to materialized view access. Depending on the specific SQL statement and other related factors, the following operations may appear in the execution plan of the relevant SQL statement.
1）MAT_VIEW ACCESS FULL
Perform a full scan directly on the materialized view to obtain relevant data rows in the materialized view, and scan all data blocks under the high water mark (HWM) of the corresponding segment of the materialized view. Like a table, a materialized view is a database object that actually stores data, and its data is stored in the corresponding segment. This operation corresponds to the operation (TABLE ACCESS FULL) in Section 7.1 of this book. This operation is specifically shown in node 1 in Figure 3-1.
