Database Systems

Database Systems is a blog about Databases and Data of any size and shape

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Saturday, 26 January 2008

RANK, DENSE_RANK AND ROW_NUMBER analytic functions

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I wrote this test to better understand the use of RANK, DENSE_RANK and ROW_NUMBER Oracle analytic functions and Top-N querying. The beauty...
Thursday, 24 January 2008

Data Modeling with Oracle JDeveloper

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Long time now I have been looking for a Free Data Modelling tool which is from the Oracle breed but is not part of a gigabytes size software...
Thursday, 6 December 2007

Upgrade an Oracle 10g database to Oracle 11g using dbua

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I am trying to upgrade my Oracle installation and a database on my Ubuntu 7.10 Desktop from Oracle (10.2.0.1) to Oracle 11g (11.1.0.6.0) usi...
Tuesday, 13 November 2007

SQL*Plus takes 100% of CPU time

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This is a bug, a funny one, which I experienced on Linux x86 boxes where SQL*Plus would just hang, and do nothing... That is, if the Linux x...
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Wednesday, 7 November 2007

Table of Dates

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Use a PL/SQL collection TYPE to generate a date list as a database table which you can then use as time series table in your data warehouse...
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