SINGLE INDEX TO QUERY MULTIPLE BACKUP FORMATS

摘要

The disclosed techniques include generation of a single index table when backing up data in a first backup format to a backup storage system that uses a second backup format. Using the single index table, a query for a data item can be answered by searching the single index table. The single index table avoids having to search through multiple index tables, each corresponding to a different backup format that may be used for backing up the searched data item.

主权项

1. A computer program product comprising a computer-readable storage medium having code stored thereon, the code, when executed by a processor, causing the processor to implement a data copy method, the method comprising:
performing a first copy operation to generate first copy data in a first backup format, without generating a corresponding index for browsing the first copy data in the first copy format; performing a second copy operation on the first copy data in the first copy format to generate second copy data in a second copy format; and generating an index table comprising entries for one or more data items from the first copy data stored in the second copy data in the second copy format, wherein each entry includes—
first access information for a data item to allow access to the data item in the second copy data, andsecond access information to allow access to the data item in the first copy data, thereby allowing direct access to the data item based on information from the index table.