T 4.46 Poor synchronisation of index data during archiving

Very large data volumes are stored during archiving. It must be possible to access all archived data at a later point in time in a controlled and unambiguous manner at any time without any delays. This function is guaranteed by the archive system generating an index of the stored files for this.

However, archive systems mostly only implement simple data accesses. In order to achieve higher levels of comfort during access, a superior data management system (DMS) is often used to control the access to the archive and to implement further functions, e.g. complex search queries.

During archiving, the DMS generates the data references, controls the data version, and, if required, creates a full text index so that all data archived on the storage medium can be identified unambiguously later.

Therefore, there are ultimately two index databases (in the archive system and in the DMS) both requiring synchronisation. If the index data stored in the DMS is changed unilaterally or if errors occur on the storage medium without these changes being taken into consideration in the other part, archived data may no longer be assigned to the references in the DMS.