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Autonomous Data Guard – First steps

Autonomous Data Guard – First steps

Recently we have announced a new member in the Autonomous family: Autonomous Data Guard. Yes it is really autonomous! All is automatic and it is very easy to use. Here are the first steps on how to use it. The GUI way Create your ADB-S Database. You can do this by clicking the “Create autonomous Database” button. Fill in some basic information Make sure you select a 19c database And of course you will need a good password. For Demo…

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Automatic block media recovery to the rescue

Automatic block media recovery to the rescue

As pointed out earlier, Oracle Active Data Guard (ADG) is a lot more than just the read-only standby database. One of the technologies no other product beats us on in regards to disaster recovery is the automatic block media recovery, which is part of the Active Data Guard license. This gets automatically enabled when you open the standby database read-only with redo apply enabled. You do not need to do something specific for it, it is just there. In spite…

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AWR on ADG

AWR on ADG

Active Data Guard is a lot more than the read-only standby database. Let’s focus on this part a bit. Read-only workloads are select workloads and are just queries. Working on a read-only database where redo apply is running results in a complex mechanism of keeping data up to date and combining it with user queries. From time to time, you can’t help but question the performance of the queries or how the overall standby database is performing. What could possibly…

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OCI cli – tooling made easy

OCI cli – tooling made easy

The OCI tool is easy to use. I had a very interesting conversation with Simon Haslam ( here on Twitter @simon_haslam ) about this. In this blogpost we will highlight the cause (and the solution) of this particular case and in a second part, there is a general workflow which did not let me down for my last deployments. 404 NotAuthorizedOrNotFound Simon and his colleagues are working with ansible and Terraform for automatic provisioning of their full environment which at…

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Connectstrings in the OCI

Connectstrings in the OCI

Under the category; asked and answered. When you have created a Data Guard config, the most obvious is that you eventually would like to connect to the Database. This is done using a connect string, often specified in tnsnames.ora or via jdbc-thin. When you read this blog post, then you end up with a Primary and Standby database. One of the questions I got last week “How can we add 2 service names in the same connect string”? I was…

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DBMS_ROLLING explained

DBMS_ROLLING explained

Active Data Guard is more than just the Read-Only Standby database. Together with your Active Data Guard license comes the “Rolling Upgrade using Active Data Guard” Feature, better known as DBMS_ROLLING. If you search this blog for Transient logical standby, you can find it here. But DBMS_ROLLING is way easier. The principle remains the same: Create the guaranteed restore point Build the logminer dictionary Convert the physical standby to a logical standby Upgrade the logical standby Start the apply again…

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19c DML redirection and Far Sync Performance

19c DML redirection and Far Sync Performance

The 19c DML redirection is one of the key features in Active Data Guard 19c. This means that a lot of questions are coming to my e-mail for this one. This blogpost will indicate how the 19c DML redirection feature works together with the Oracle Active Data Guard Far Sync instance and how this impacts performance. The 19c New features guide, which you can find here, describes this feature as follows: Incidental Data Manipulation Language (DML) operations can be run…

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PDBs and role transitions

PDBs and role transitions

Now, we currently do not have per-PDB role transitions. Nevertheless, it is possible to move one PDB to another CDB. However, what if the other CDB is located at the DR site and you don’t want to copy all the data over the network again? Well, this is possible! For this to work, we need 2 CDB’s. One primary in Site A protected by a Standby CDB in Site B. The second CDB is primary in Site B and protected with…

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