PeopleTools 8.54: Materialized Views
This is part of a series of articles about new features and differences in PeopleTools 8.54 that will be of interest to the Oracle DBA.Materialized Views in the DatabaseSnapshots were introduced in...
View ArticlePeopleTools 8.54: Materialized Views
This is part of a series of articles about new features and differences in PeopleTools 8.54 that will be of interest to the Oracle DBA.Materialized Views in the DatabaseSnapshots were introduced in...
View Article12c MView refresh
Some time ago I wrote a blog note describing a hack for refreshing a large materialized view with minimum overhead by taking advantage of a single-partition partitioned table. This note describes how...
View ArticleUnion All MV
In an article I wrote last week about Bloom filters disappearing as you changed a SELECT to a (conventional) INSERT/SELECT I suggested using the subquery_pruning() hint to make the optimizer fall back...
View ArticleNested MVs
A recent client was seeing a very large redo penalty from refreshing materialized views. Unfortunately they had to be refreshed very frequently, and were being handled with a complete refresh in atomic...
View ArticleComplex materialized views and fast refresh
Just a quick discovery that came across the AskTOM “desk” recently. We have an outstanding bug in some instances of fast refresh materialized views when the definition of the materialized view...
View ArticleComplex materialized views? Try a table first
Just a quick post today that arose from an AskTOM question a little while back. Over the years and across the evolution of various versions of the Oracle database, the amount of “power” you could pack...
View ArticleModifying tables without losing materialized views
Whilst the ever increasing speed of storage and servers, and features likes In-memory are decreasing the need for large numbers of materialized views in databases, there are still plenty of use cases...
View ArticleA refreshing look at PIVOT
We had an AskTOM question come in recently where our customer was very excited about the PIVOT operator in SQL which lets you transpose rows to columns. This is a very common requirement in...
View ArticleGROUP BY might be distinctly better than DISTINCT
One of the cool things with materialised* views in Oracle is their ability to be kept in sync with the source table(s) from which they are derived from, in real time or near real time. To achieve this,...
View ArticleExplain Rewrite
This is one of those notes that I thought I’d written years ago. It answers two questions:what can I do with my materialized view?why isn’t the optimizer using my materialized view for query...
View Article
