# 22. Virtuoso Functions Guide - VAD_CHECK

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## VAD_CHECK

Checks the package has not been altered since installation
array DB.DBA.VAD_CHECK (in package_name varchar);
Description

This checks to see if the elements of the package are as they are defined in the original distribution. A list of differing elements is returned. This does not always indicate a corruption since a later version or another package may add columns to tables, and some resources may be customized after installation.

Parameters
package_name – name of package '/' version e.g: 'virtodp/1.0'
Return Types

A list of differing elements is returned as an array of 3-item structures: key, initial value, final value.

See Also

vad_check_uninstallability()

vad_check_installability()

vad_install()

vad_pack()

vad_safe_exec()

vad_uninstall()

vad_fail_check()

vad_load_file()