QlikView QVDs play a crucial part in the majority of QlikView implementations.
Basically, a QVD is a flat data file with the extension .qvd. It can store a single table of data and is typically created in the load script of a QVW file. The structure of the file is essentially an XML format, with various bits of header information stored at the top of the file and the rest of the data beneath. One of the beauties of a QVD file is that it is compressed on creation using the same algorithms as QlikView uses to store data in memory – so the files can be incredibly small for the amount of data they contain. Loading from QVD back into memory is blindingly fast as the format of the file mirrors how QlikView addresses data in RAM.
This particular field describes the creation and use of qlikview data files (QVDs). QVDs are important in most qlikview application projects as they provide a means of batch extractions from a data source. This decreases the load on database and network. Once a base QVD is generated, an incremental load script can ensure that only the new or updated records are saved to the QVD (and the deleted records are removed) when the script is made to run again. QVDs also save, reload time and space as they are both highly compressed and lightning fast when used as a load source in qlikview queries.
There are many reasons for why one must use QVD, some of these are:
Related Page: OLE DB/ ODBC Connection To Data Sources In Qlikview
QVD files offer many advantages to your qlik view applications, including the following:
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