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Daniel Westermann

OGG: Unable to lock file “/xxx/de000000″ (error 11, Resource temporarily unavailable).

By | Database Administration & Monitoring | No Comments

When you see the above message in the GoldenGate logfile there are usually orphan processes that prevent GoldenGate from locking the file (typically when your trail files are on NFS). In a case I had at a customer last week this was not the case. It could be confirmed that there are no other processes sitting on the file by doing an fuser on the file on all nodes of the cluster (This was an…

 
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Mouhamadou Diaw

Dataguard Oracle 12.2: Keeping Physical Standby Sessions Connected During Role Transition

By | Database Administration & Monitoring | No Comments

As of Oracle Database 12c Release 2 (12.2.0.1), when a physical standby database is converted into a primary you have the option to keep any sessions connected to the physical standby, without disruption, during the switchover/failover. When the database is reopened as the primary, the suspended sessions resume their operations as if nothing had happened. If the database (or an individual PDB) is not opened in the primary role, the sessions will be terminated. To…

 
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William Sescu

Oracle – RMAN Backups to CIFS

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

Not to often, but sometimes you need to offload your RMAN backups and your DataPump exports to CIFS. You might run out of space on your NFS server, or you are a Windows shop who has only CIFS shares, and then you might need to put your RMAN backups to CIFS. One very important MOS Note regarding RMAN backups to CIFS is the following Is use of CIFS Protocol for RMAN backups supported? (Doc ID…

 
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Franck Pachot

Oracle Public Cloud 12cR2: TDE is not an option

By | Cloud, Database Administration & Monitoring | No Comments

In Oracle Public Cloud, Transparent Data Encryption is not an option. You can use it because it is included in all database services for all editions. You have to use it because the database won’t allow you to create, or import, non encrypted tablespaces. This is controlled by a new parameter, encrypt_new_tablespaces, which defaults to CLOUD_ONLY;  

 
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Franck Pachot

Exadata Express Cloud Service: MAX_PDB_STORAGE

By | Cloud, Database Administration & Monitoring | No Comments

The separation of roles between system DBA and application DBA is the way to go for agile development and the PDBaaS managed service is an excellent way to play with this concept: You are PDB administrator but not the CDB administrator. Here is an example about tablespace creation/deletion, and the kind of problems that may arise with this architecture.  

 
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Franck Pachot

Running SLOB on Exadata Express Cloud Service

By | Database Administration & Monitoring | One Comment

The Exadata Express Cloud Service is a managed PDBaaS: Oracle is the system admin and the CDB database administrator, you are the PDB administrator. You connect with a local user, PDB_ADMIN, which is no SYSDBA privilege but has a PDB_DBA which has nearly all DBA rights, but with some features disabled by lockdown profile. I have no worry about the performance on this service: it is an Exadata X5 half rack bare metal (my guess),…

 
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Franck Pachot

Oracle Core factor and Oracle or non-Oracle Cloud

By | Database Administration & Monitoring | 2 Comments

Oracle Database licensing can be based on two metrics: Processor or Named User Plus (NUP). NUP also necessitate to count the processors because there is a minimum number of NUP per processor. Then it is very important to know how to count processors. The time where a machine had 1 socket with 1 processor with 1 chip with 1 core running 1 thread is really old past. Today, we have physical machines with multi-core processors,…

 
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