Talk:OLAP cube

message: Shouldn't this article reference ROLAP, MOLAP, and HOLAP cubes as well? 65.202.85.9 15:23, 11 January 2007 (UTC)
replies: text: I don't think so. ROLAP, MOLAP and HOLAP are all about different physical storage methods. The logical essense of OLAP Cube is the same regardless of physical storage details. Wikiolap 17:03, 11 January 2007 (UTC)

text: I think it should relate to all the other OLAPs, since a cube is a MOLAP and others like ROLAP (relational OLAP) are totally different concepts and ways of preparing the data to be queried.  —Preceding unsigned comment added by 12.145.46.162 (talk) 23:36, 11 September 2007 (UTC)
thread_title: Other cubes

message: Can someone please explain the functional notation here? I believe it should be f: (X, Y, Z) |--> W, not W: (X, Y, Z) |--> W. Ericdbw 06:15, 16 September 2007 (UTC)
thread_title: Functional notation

message: The timestamp example does not clearly explain the benefit of assigning an ID value to a timestamp when the timestamp itself could be used. It seems like useless abstraction. Could someone more knowledgeable provide a more clear example?  —Preceding unsigned comment added by 24.165.146.46 (talk) 02:32, 13 June 2009 (UTC)
thread_title: Timestamp Example

message: Text says: An OLAP (Online analytical processing) cube is a data structure that allows fast analysis of data. It can also be defined as the capability of manipulating and analyzing data from multiple perspectives.
This is followed by a reference to an article by Codd.  I have the following issues with the above:
:* I don't think an OLAP cube is a recognized data structure, but is rather, perhaps, a conceptual data model.
:* the referenced article by Codd does not contain the words cube, fast, or analysis.
:* the second sentence (It can also be defined as...) is incorrect. An "OLAP cube" is not a "capability".
The section goes on to say that "Relational databases are not well suited for near instantaneous analysis and display of large amounts of data", despite the existence of ROLAP and the fact that some proponents of the relational model think performance is a red-herring (after factoring in the need for integrity constraints processing outside of the DBMS).  For example, see http://www.information-management.com/issues/20020601/5251-1.html.  So I don't think this sentence is well founded.  At a minimum it needs a reference and I have marked it up as dubious/citation needed.
The following sentence is presented as a statement of fact, but does not provide any references: "Although many report-writing tools exist for relational databases, these are slow when the whole database must be summarized."  The problems I have with this statement are:
:* "slow" is meaningless without context; what is slow for some application may be perfectly acceptable in other uses. Since the intention of this section is to make the case for OLAP cubes, I think this should say "slower than using OLAP cubes", or some such.
:* a good reference should be cited that is accepted by the mainstream DBMS community as authoritative.  It would have to compare like for like results showing where OLAP cube performance is typically better than "report writing tools for relational databases", whatever that is  —Preceding unsigned comment added by 47.166.133.98 (talk) 16:48, 19 October 2009 (UTC)
thread_title: OLAP Cube (introductory) section

message: Language like
The arrangement of data into cubes overcomes a limitation of relational databases.  Relational databases are not well suited for near instantaneous analysis and display of large amounts of data.
sounds like an advertisement, not NPOV.
Crasshopper (talk) 05:05, 2 March 2010 (UTC)
replies: text: A cube can be implemented in rdb, so where's the point ? The difference that could have been emphasized is transaction-optimized vs read-mostly optimized, instead. The current wording is not factual and rather misleading marketoid talk. --Lysytalk 22:26, 21 March 2010 (UTC)
thread_title:  NPOV dispute 

message: This article currently links to residual, which is a disambiguation page.  The link needs to get replaced by residual. Michael Hardy (talk) 19:59, 5 May 2011 (UTC)
thread_title:  Disambiguation of "residual" 

message: The unmathematical definitions on this article confuse me. In the "Mathematical definition" section, f is not defined, so it might be anything including the identity function (W is not defined either). So is the cube just an Rn or Xn space, or a multidimensional array? --Nemo 14:13, 9 June 2015 (UTC)
thread_title:  Mathematical definition