Oracle ODP.NET: Resolve “Arithmetic operation resulted in an overflow” or “Specified cast is not valid”

This is similar to "Oracle Nasty Dates Finder for .NET folks!" but this time it is for numbers instead of dates! I ran into this issue as I was moving data from Oracle to SQL Server. So, you are working with Oracle using ODP.NET and you have a simple, straight-forward SELECT * FROM TABLE; Alternatively, …

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Oracle: Find The Total Size Of All Of Your CLOB & BLOB Columns In All Tables

Today I received a request from an application owner who wanted to know the size of all the CLOB and BLOB columns in all the non-system tables so that they have a good idea of the size involved for a migration. Tables with BLOB/CLOB columns The SQL to find the tables with the BLOB/CLOB columns …

Eating An Elephant – How To Work With Huge Datasets In Oracle And SQL Server

Simplifying complex problems is difficult but when done, the rewards are definitely worth it. How I single-handedly managed to migrate 55 Billion rows in 4000+ tables: Last year, I created PowerPump a PowerShell based data copy server which continuously migrated 4000+ Oracle tables to SQL Server. It was no simple task given that I had …

Oracle – Simple/Reusable Statement Runner Using PL/SQL Table Type (Collection)

In an Oracle anonymous block based script, how many times do you run into situations where what needs to be done remains a constant but what that logic works with, keeps changing? Parameters are a great way to do it too but in the illustration below, we are going to use PL/SQL table type (collection). …

Oracle – Easy Date Strings (and NOT)

Whenever I type in a date strings in Oracle, I convert the strings to Date data type in my code as well as my queries without relying on the session setting for date format. I will explain why. Session date format setting: Session date format settings govern how date strings should be converted into dates (the …