Way of hiding details of a computing subsystem, allowing separation of concerns and interoperability.
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InfoWorld: I understand that Drupal 7 will feature a database abstraction layer.
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Buytaert: Drupal 7 will have a completely new database abstraction layer.
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With the new database abstraction layer, we'll see support for many more databases.
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It's better to hide the data sources behind an abstraction layer.
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It's an abstraction layer that sits over an operating system.
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Although there are differences between the two, the differences are hidden behind an abstraction layer.
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Storage virtualization creates an abstraction layer between host and physical storage that masks the idiosyncrasies of individual storage devices.
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However, with the advent of HVM as an abstraction layer, the administrator can simply specify HVM and let Xen figure out the details.
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It will be written from scratch and it actually does address a whole bunch of shortcomings with the database abstraction layer in Drupal 6.