As I understand it, the nested=>true option always refres thanks in advance. But what if it takes too long to refresh the materialized views? Materialized Views in Oracle; Introduction. Refreshing nested materialized views Hi,When I have 2 materialized views (MV_1A and MV_1B) that are based on the same materialized view (MV_1) then using dbms_mview.refresh with the nested=>true option on 1 of those materialized views invalidates the other materialized view. your help will be appreciated. When you compile the MV, Oracle revalidates the query upon which the view is based. Each materialized view log is associated with a single base table. * Materialized view that would go invalid... just so happens after every refresh attempt * View was FAST refreshable The problem was that the Materialized View Log was missing, so the refresh was failing. The status of 'COMPILATION_ERROR', however, is not expected. The compile_status will be 'VALID' right after a refresh but before there is DML on the master table; it will be 'NEEDS_COMPILE' after there has been DML on the master table. We got ora-4045 while running a query again a materialized view. According to Oracle: 'A materialized view is automatically revalidated when it is referenced'. RE: Schema Browser: Why do Materialized Views show INVALID when in Mat. regards. We only had DML on the base tables. One materialized view in my database is scheduled for refresh after every 1 hour. Materialized Views are often used in data warehouses to improve query performance on aggregated data. os:rhel 6. You can check whether your view needs to be recompiled by checking the STALENESS column in USER_MVIEWS for your MV in question. A Refresh of a materialized view is a data operation. A materialized view log is a schema object that records changes to a base table so that a materialized view defined on the base table can be refreshed incrementally. Here are some basic rules to improve refresh performance.Unlike indexes, materialized views are not automatically updated with every data change. NEEDS_COMPILE - Some object upon which the materialized view depends When it gets refreshed staleness state is 'NEEDS_COMPILE' and not showing recent updated data in the it. Reply by John Dorlon The 2nd to last toolbar button on the Schema Browser gives you a legend of all of the icons. Validity of the materialized view with respect to the objects upon which it depends: VALID - Materialized view has been validated without error, and no object upon which it depends has changed since the last validation. View mode? NEEDS_COMPILE; COMPILATION_ERROR; The first two are normal behavior. They must explicitly be refreshed, either on every… Why it is so and how to fix it? This information comes from the COMPILE_STATE of DBA_MVIEWS. last_refresh_date - date of the last refresh of the materialized view; compile_state - indicates validity of the materialized view (VALID/NEEDS_COMPILE/ERROR) Rows. Materialized views are a really useful performance feature, allowing you to pre-calcuate joins and aggregations, which can make applications and reports feel more responsive. icon for materialized views indicates “needs compile”. Therefore, whenever a transaction commits which has updated the tables on which a materialized view is defined, those changes are automatically reflected in the materialized view. So when the materialized views will be 'automatically revalidated' and when they will not and we get ora-4045? The ! The materialized view log resides in … It seems the Materialized View needs to be compiled. Have also a look at Invalidating Materialized Views in the Database Data Warehousing Guide and the ALL_MVIEWS Reference in the documentation. 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