Infrastructure at your Service

Category

Hardware & Storage

Yann Neuhaus

Replace a voting disk is so easy with Grid Infrastructure 11.2 & ASM!

By | Hardware & Storage | No Comments

For a few day we had a quick request at a customer which was to replace a voting disk in an ASM disk group. The current ASM disk group (redundancy normal) had 3 disks : two located in one data center and one disk in another data center. The goal was to replace one voting disk (from the most used Data Center) with one disk coming from a third Data Center.

Read More
Grégory Steulet

MySQL Data High Availability with semi-synchronous replication

By | Hardware & Storage | No Comments

Starting with MySQL 5.5 it is possible to configure semi-synchronous replication. As you probably know, by default, MySQL replication is asynchronous.  Asynchronous replication means that events/transactions applied on one server are not immediately applied on the other one. In the specific context of MySQL such behavior means that the MySQL Master writes transactions/events to the local binary logs, however it has no idea when the slave(s) will get and process them. Of course such configuration can lead, in case of failover, to some transaction loss since there is no guaranty that the transactions have been transmitted on the standby server(s).

Read More
Oracle Team

LOB : « enq : HW contention » 

By | Hardware & Storage | No Comments

Aprés le post sur « Utilisons les securefile », revenons sur le sujet LOB avec une approche performance, stockage.

 Nous rencontrons parfois des modèles de données étranges, nous aurions envies en tant que DBA de tout reprendre à zéro pour refaire un modele relationnel en 3em forme normal (3NF), plus efficace et mieux conçu dans notre « RDBMS » favori, mais la réalité étant ce qu’elle est nous devons faire avec et au mieux.

De plus Oracle n’est pas qu’une base de données relationnelle 🙂 on l’oublie trop souvent.

Read More
Hervé Schweitzer

RMAN backup is failing due to “corrupt blocks”

By | Hardware & Storage | No Comments

Last week, I was not able to complete a backup because of the ORA-19566 error: “exceeded limit of 0 corrupt blocks”. Here is what you can do to fix it. Starting Point: backup error Here is the starting point of this case. The following error is found in the RMAN Backup log file: allocated channel: ch1 channel ch1: sid=25 devtype=DISK Starting backup at 27-APR-11 channel ch1: starting incremental level 0 datafile backupset channel ch1: specifying…

Read More
Jérôme Witt

VMware Tools auf Oracle Enterprise Linux 5.6 Guests installieren

By | Hardware & Storage | No Comments

Wenn Sie einen Oracle Datenbank Server auf VMware ESX betreiben, sollten Sie die VMware Tools nicht unterschätzen. Sie sind nicht nur sinnvoll bei Copy-Paste-Aktionen oder für bessere Grafiken, sondern liefern ebenfalls High-Performance-Network, Storage Adapter (PVSCI), Treiber, etc. Auf Linux Guests müssen die Tools mit dem Kernel zusammen kompiliert werden. Besonders auf Oracle Enterprise Linux 5 Upgrade 6 gibt es ein Problem: OEL 5.6 und OEL 6.0 nutzen den neuen Oracle Unbreakable Kernel 2.6.32-100. Wenn Sie…

Read More
Grégory Steulet

Saving time and increasing service availability with MySQL Enterprise Monitor 2.3

By | Hardware & Storage | 3 Comments

Nowadays MySQL Databases are encapsulated into many mission critical software solutions. Lots of companies host one or many MySQL databases in their data center, sometimes even without knowing it except when the MySQL service is no more available. In order to increase this service availability it is mandatory to have a monitoring solution. Regardles of you are using MySQL Server, MySQL replication or cluster the Oracle/MySQL monitoring solution is called MySQL Enterprise Monitor.

Read More