multiple materialized views

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multiple materialized views

New in Oracle Database 10g Release 2 multiple materialized views:

More than one materialized view can be used by Query Rewrite in each query block
Expands the situations when rewrite can occur

Oracle 10g release 2 will automatically detect when materialized view can be combined and used when a query specifies multiple aggregations. The execution plan for multiple materialized views looks like this:

---------------------------------------------------------------------------------------

| Id | Operation | Name | Cost (%CPU)|

---------------------------------------------------------------------------------------

| 0 | SELECT STATEMENT | | 5 (20)|

| 1 | HASH GROUP BY | | 5 (20)|

| 2 | VIEW | | 4 (0)|

| 3 | UNION-ALL | | |

|* 4 | MAT_VIEW REWRITE ACCESS FULL| MV1 | 1 (10)|

|* 5 | MAT_VIEW REWRITE ACCESS FULL| MV2 | 1 (10)|

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