Data Blog

SQL Tuning – filtered rows percentage method

SQL Tuning – filtered rows percentage method

Kevin Meade is the author and publisher of his own book "Oracle SQL Performance Tuning and Optimization" - It's all about the cardinalities". His book is rather unknown as there is not much marketing about it. Unfortunately. Because it is a great book for the SQL...

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Schemaless revolution and data migration burden

The need to model all data up front caused developers to tag relational databases with attributes like inflexible, dated, annoying, painful, etc. It is often not possible anymore to define a schema that remains stable for some revisions in case of continuous...

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Lambda Architecture, Master Dataset and Data Vault

Lambda Architecture, Master Dataset and Data Vault

The Lambda Architecture got known after Nathan Marz' and James Warren's book about Big Data. The authors describe a data processing architecture for batch and real-time data flows at the same time. Fault-tolerance and the balance of latency vs throughput are main...

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SQL – Only the Strong Survive

There are tons of tech predictions at the end of every year. Eric Knorr lists "The incredible SQL comeback" in his 9 enterprise tech trends for 2017 and beyond. An old, mature programming language as the prevailing trend for 2017 and later?After years of NoSQL...

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Is my Oracle database healthy?

It's a common question if a database is in a healthy state. DBA_REGISTRY shows the status of components loaded into the database. Mike Dietrich mentions in his blog two additional checks that should be performed regularly during off-peak hours for Oracle...

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Data Vault 2.0, Hashing and DB2 LUW

Data Vault 2.0, Hashing and DB2 LUW

Hashing is part of Data Vault 2.0. Hash Keys are used to provide a surrogate for business keys detect changes in fields in Satellite tables. Oracle, SQL Server, Informatica, etc have built-in functions to compute a hash key. Example with Oracle: select...

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Amazon Redshift (hosted DWH) – SQL for simplicity

NoSQL databases like Amazon Dynamo got quite popular in the OLTP market. Their marketing credo is supposed to be simplicity compared to RDBMS. The absence of a declarative programming language like SQL means that a lot of work has to be done in the application though....

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DataBeat week 06/2015

Reference to blogs, tweets, discussions, etc that caught my attention during the last week.Data Modeling"Data Modeler Of 2020" YouTube video by Steve Hoberman addresses topics like modeling for NoSQL or BigData, Fact Based Modeling, becoming more agile, etc."Basic...

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DataBeat week 05/2015

Reference to blogs, tweets, discussions, etc that caught my attention during the last week.Data Architecture"Immutability changes everything" by Pat Helland deals with immutability as a key architectural concept. Append-only computing instead of changing data is also...

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