The two best-known RDBMS (Relational Database Management Systems) with the largest market shares are Microsoft SQL Server and Oracle Database. They have a lot in common but also a lot of differences between them. Let's see in detail: Filegroups: They are… read more
How do we backup an Oracle Database that is in archive-log mode
In this article we will analyze what it takes to take an online backup of an Oracle database that is in archived-log mode. In order to take a backup in addition to the datafiles, we should also take a backup of the controlfile,... read more
How can we see historical image of a table in Oracle Database with Flashback Query
Many times we will need to see what entries the table had some time ago. We may still have to restore it from a wrong update or even drop. In Oracle this is easily done using flashback query… read more
How do we return an Oracle database to the previous state of a restore point (Flashback Database to guaranteed restore point)
In the article we will analyze how we can use the flashback database function in a guaranteed restore point in an Oracle database. The flashback database belongs to the category of data protection and provides the possibility to freeze the… read more
Query join between SQL Server and Oracle tables? (aka PolyBase)
In the article we will see a magical way so that we can use in select queries data from external sources (without Linked Server) and more specifically from Oracle Database. What is PolyBase As of SQL Server 2016 the… read more
How to export bulk data from Oracle database using Oracle Data Pump (expdp)
Many times we will need to keep the table data and their metadata (packages, procedures, functions, etc.) so that we can then import them into the same or a different system. The data can be extracted using the… read more
How do we apply the latest patch (PSU) to an Oracle database
In the article we will analyze the process of patch set update (PSU) in Oracle Database. The process is done through the two Oracle tools, OPatch and Datapatch. OPatch is a tool that allows you to apply and uninstall… read more
How we can easily backup metadata in an Oracle database
Sometimes we need to backup a procedure, a package, a function, etc. (the so-called metadata) so that we can see its code or keep it somewhere so that we can restore it if necessary. In this article we will see… read more
How do we backup a database that is in no-archive-log mode in Oracle
In this article we will analyze what it takes to take an offline backup of an Oracle database that is in no-archive-log mode. As the base does not keep the redo logs as an archive, we do not have the option for online... read more
