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Oracle File Extent Map, the Old-Fashioned Way

Yes, I know, this subject of detailed extent map of the datafiles is a rather old one, and a few different solutions have been provided by several professionals, including the famous Tom Kyte. But none of the answers I found did exactly what I wanted, and therefore, I chose to write my own solution. OEM does provide this, but for a price — the Tablespace Map is part of the Oracle Tuning Pack — and I like the free stuff and the extra flexibility I have using queries.

Installing Oracle 11g on Ubuntu Linux 7.04

come from a MySQL background, and I have been given the challenge of learning Oracle. So I decided to install my own Oracle database, which I’ll be free to destroy in every way I can think of… and of course, free to bring it back to life. Recovering from crashes will probably be the most difficult part of my adventures in the Oracle world, but let’s take one step at a time, shall we? This tutorial was based on a document which can be found here. I have adapted it for Oracle 11g.

Total Recall by DUDE: Extracting Oracle Data After RAID Corruption

Last Friday, a customer paged me to say that they could not open an Oracle 8.0.5 database after the RAID array crashed. It turned out that this database was in NOARCHIVELOG mode and there was not even a cold backup. Furthermore, they didn’t even have a database export. it was definitely the time to recall Kurt Van Meerbeeck and his all-time-hit tool — the DUDE. DUDE stands for Database Unloading by Data Extraction. The client was very impressed by how we were able to recover from a deadly situation like that, and it was only possible thanks to the DUDE and his creator: thanks a lot Kurt.

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