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Jérôme Dubar

Jérôme Dubar

Speed up datapump export for migrating big databases

By | Database Administration & Monitoring, Database management, Hardware & Storage, Oracle | 3 Comments

Introduction Big Oracle databases (several TB) are still tough to migrate to another version on a new server. For most of them, you’ll probably use RMAN restore or Data Guard, but datapump is always a cleaner way to migrate. With datapump, you can easily migrate to a new filesystem (ASM for example), rethink your tablespace organization, reorganize all the segments, exclude unneeded components, etc. All of these tasks in one operation. But datapump export can…

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Jérôme Dubar

odacli create-database extremely slow on ODA X8-2 with 19.5

By | Database Administration & Monitoring, Database management, Hardware & Storage, Operation systems, Oracle | No Comments

Introduction ODA X8-2, in the S, M or HA flavour, is the new database appliance from Oracle. But as a brand new product, you can experience troubles due to the lack of maturity. This time, it concerns database creation that can be extremely slow on these servers if you are using ODA 19.5. Deployment, appliance creation and core configuration X8-2 reimaging is fine, and appliance creation is done without any problem on X8-2. Don’t hesitate…

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Jérôme Dubar

Should I go for ODA 19.5 or should I wait until 19.6?

By | Database Administration & Monitoring, Database management, Hardware & Storage, Operation systems, Oracle | No Comments

Introduction As you may know, Oracle Database 19c is available for new (X8-2) or older Oracle Database Appliances since several weeks. Current version is 19.5. But when you go to the official ODA documentation , it still first proposes version 18.7 not compatible with 19c databases. Here is why. 19c database is the final 12.2 First of all, 19c is an important release because it’s the terminal release of the 12.2, as 11.2.0.4 was for…

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Jérôme Dubar

Make Oracle database simple again!

By | Database Administration & Monitoring, Database management, Development & Performance, Hardware & Storage, Operation systems, Oracle | 6 Comments

Introduction Let’s have a look at how to make Oracle database as simple as it was before. Oracle database is a great piece of software, yes it’s quite expensive, but it’s still the reference and most of the companies can find a configuration that fits their needs according to a budget. Another complain about Oracle is the complexity: nothing is really simple, and you’ll need skillful DBA(s) to deploy, manage, upgrade, troubleshoot your databases. But…

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Jérôme Dubar

Focus on 19c NOW!

By | Database Administration & Monitoring, Database management, Oracle | 2 Comments

Introduction For years, Oracle used the same mechanism for database versioning. A major version, represented by the first number. And then a release number, 1 for the very first edition, and a mature and reliable release 2 for production databases. Both of them having patchsets (the last number) and regular patchset updates (the date optionally displayed at the end) to remove bugs and to increase security. Jumping from release 1 to release 2 required a…

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Jérôme Dubar

A day of conferences with the Swiss Oracle User Group

By | Database Administration & Monitoring, Database management, Oracle | No Comments

Introduction I’m not that excited with all these events arround Oracle technologies (and beyond) but it’s always a good place to learn new things, and maybe the most important, discover new ways of thinking. And regarding this point, I was not disappointed. Franck Pachot: serverless and distributed database Franck talked about scaling out, it means avoid monoliths. Most of the database servers are this kind of monoliths today. And he advises us to think microservices….

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Jérôme Dubar

odacli create-database error DCS-10802: Insufficient disk space on file system: database

By | Database Administration & Monitoring, Database management, Operation systems, Oracle | No Comments

Introduction I was reimaging an X6-2M ODA after various patching troubles, and everything was fine. After several databases created, the next ones could no more be created. DCS-10802: Insufficient disk space on file system: database. Expected free space (MB): {1}, available space (MB): {2} I’ve spent some time on it, and finally found the cause of the problem. And the solution. Context After successfully reimaged an X6-2M ODA with 18.5, and applied the patch for…

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Jérôme Dubar

ODA X8-2: the new generation

By | Database Administration & Monitoring, Hardware & Storage, Oracle | 2 Comments

Introduction ODA X7-2 marked the maturity of the Oracle Database Appliance evolution, with 3 models suitable for nearly all customers using Oracle databases. The X7-2M was my favorite, with a lots of cores available (and restrainable), enough memory for dozens of databases, and strong storage performance and capacity (with a maximum of 50TB RAW NVMe). And taking up only 1U of space in your rack. Today, 2 years later, Oracle just introduced the new generation…

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Jérôme Dubar

Useful Linux commands for an Oracle DBA

By | Database Administration & Monitoring, Operation systems, Oracle | 3 Comments

Introduction Oracle & Linux is a great duet. Very powerfull, very scriptable. Here are several commands that make my life easier. These tools seems to be widespread on most of the Linux distributions. watch with diff It’s my favorite tool since a long time. watch can repeat a command indefinitely until you stop it with Ctrl+C. And it’s even more useful with the – -diff parameter. All the differences since last run are highlighted. For…

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Jérôme Dubar

Patching or reimaging your ODA?

By | Database Administration & Monitoring, Hardware & Storage, Operation systems, Oracle | No Comments

Introduction One of the key features of the ODA (Oracle Database Appliance) is the ability to patch the entire stack every three months, the goal being to keep all the components up-to-date. Most of the customers won’t patch so often, but one patch a year is quite a good average. But when comes the time for patching, comes the time for anxiety for the DBA. And it’s totally justified. Why ODA patching can eventually be…

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