Hi Kumar,
QVW- QlikView document is a file containing everything needed to analyze the data:
the data itself
the script needed to update the QlikView file with new data from the data source
layout information, including all the sheets, list boxes, charts, etc.
document alerts, document bookmarks and document reports
access restriction information
macro module
it is thus very easy to distribute
A QVD (QlikView Data) file is a file containing a table of data exported from QlikView. QVD is a native
QlikView format and can only be written to and read by QlikView. The file format is optimized for speed
when reading data from a QlikView script but it is still very compact. Reading data from a QVD file is typically
10-100 times faster than reading from other data sources.
QVD files can be read in two modes: standard (fast) and optimized (faster). The selected mode is determined
automatically by the QlikView script engine. Optimized mode can be utilized only when all loaded fields
are read without any transformations (formulas acting upon the fields), though the renaming of fields is
allowed. A WHERE clause causing QlikView to unpack the records will also disable the optimized load.
A QVD file holds exactly one data table and consists of three parts:
1. A well formed XML header (in UTF-8 char set) describing the fields in the table, the layout of
the subsequent information and some other meta-data.
2. Symbol tables in a byte stuffed format.
3. Actual table data in a bit-stuffed format.
28.1 Purpose of QVD Files
QVD files can be used for many purposes. At least four major uses can be easily identified. More than one
may apply in any given situation:
Regards
Andy
