Talk:Materialized view

Write-Through

It is not clear from the description under which circumstances the data written into a view or materialized view is passed on and written into the original table, or if that is possible at all for a materialized view.

Vendor-Specific Info

This article (as of Oct 2nd, 2008) confuses vendor-specific stuff, like whether "Advanced Replication" is installed, with the database design concept. To partially answer the question above, the specifics of if and when base tables are updated when updating a materialized view is implementation-specific. Maybe they're effective immediately. Maybe the updates only update the materialized view and don't ever make it back to the base tables. Maybe your DBMS doesn't even support materialized views. It depends on which database you're running. Let's remove that stuff from the article. Maybe we can move it into a separate section with a grid comparing the functionality of some popular DBMS's. 167.136.142.30 (talk) 19:22, 2 October 2008 (UTC)

I've removed the Oracle-specific stuff and added a bit of text on materialized views in different databases. Perhaps someone else can expand on that. -- Levin (talk) 07:42, 17 May 2010 (UTC)

Full disclosure: I work at ScyllaDB; we also support Materialized Views. I didn't want to go and put it in directly to the document due to WP:COI, but there might be a round-up of a broader list of vendors and open source projects and their current status of support. For instance, Cassandra has MVs, but they are still considered problematic. --Petercorless (talk) 15:53, 24 September 2018 (UTC)

SQL Server

Microsoft SQL Server has a similar feature called "indexed views"

should imho be changed to "Microsoft SQL Server has no feature that is comparable." (works completely different and is by far more complicated and less flexible) 212.90.151.90 (talk) 16:17, 10 January 2013 (UTC)

Drawbacks of Materialized Views

It would be interesting which drawbacks arise from using materialised views (Update Overhead, time drift of base table and materialzed view)

213.61.213.230 (talk) 14:12, 12 January 2016 (UTC) Velten Heyn

Better explanation required

From my point of view this part require a better explanation and some sources:

In contrast, in a normal view, it's typically only possible to exploit indexes on columns that come directly from (or have a mapping to) indexed columns in the base tables; often this functionality is not offered at all.