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SQL Challenges,

SQL Challenge: Tackling the Island Problem in Time Series Data

Jump into our SQL Challenge! Today, we’re exploring customer loyalty trends. Are you prepared to show off your SQL skills? About the quiz In this SQL pop quiz, we’re challenging you to demonstrate your understanding of islands in a time series data set. Whoever submits the correct and most performant query will be featured in …
Uli Bethke November 7, 2023
Flexter,

Deep dive on XML converters, XML conversion tools and XML conversion projects

Are you looking for an XML converter or XML conversion tool for enterprise use cases? Are you looking for advice and tips and tricks for an XML conversion project? If…
charlie October 4, 2023
Snowflake,

7 guardrails against common mistakes that inflate Snowflake credit usage 

Dodge costly pitfalls Snowflake implementation has pioneered dozens of innovations in the data platform space. The long list includes separation of compute and storage, physical workload separation, data sharing, data…
Uli Bethke September 13, 2023
FlowHigh,

Automatically detect bad SQL. Static and dynamic analysis of SQL code

Preventing Query Catastrophe with FlowHigh SQL Analyser Does the following sound familiar? As the wizard EsQuEl delved deep into the SQL code, he stumbled upon multiple instances where tables were…
Uli Bethke September 8, 2023
FlowHigh, FlowHigh,

From Code to Clarity: Visualizing SQL code for Documentation and Debugging

In this post we will show you how you can create a visual diagram of your SQL code. We will use the FlowHigh SQL visualiser to achieve this. FlowHigh is…
Uli Bethke May 29, 2023

Recent Articles

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Business Intelligence,

Competitive Business Intelligence: web scraping with Oracle.

In my opinion, one of the trends for Business Intelligence in 2009 (and the years to come) will be the integration of externally available data (data not found within the…
Uli Bethke January 6, 2009
Business Intelligence,

Make a difference to your bottom line with BI

In the first two chapters the authors develop their core argument. BI projects are only successful when they have a positive impact on the bottom line of an organisation. BI…
Uli Bethke December 4, 2008
Best Practice,

OWB Best Practice Part 1: Logically organise your DW project with Collections

Once you have gone beyond the implementation of more than one data mart for your Enterprise Data Warehouse project in Oracle Warehouse Builder, it becomes harder and harder to find…
Uli Bethke November 12, 2008
Change Data Capture,

CDC & Streams Performance Test

Scenarios Objective of the Streams Performance Test was to identify risks and bottlenecks for CDC and Streams. The following items were of particular interest to us: Identify bottlenecks for batch…
Uli Bethke November 11, 2008
Oracle,

Asynch CDC: Delete old archived redo logs

The following steps need to be taken to be able to delete archived redo logs that are no longer required by the CDC capture process: 1. Determine the new first_scn…
Uli Bethke October 9, 2008
Oracle,

Asynch CDC: Waiting For Dictionary Redo

I have come across (so far) four scenarios that show capture process "hanging" as WAITING FOR DICTIONARY REDO. 1. Wrong first_scn supplied for create_autolog_change_source: The first_scn when building the the…
Uli Bethke October 8, 2008