2.15.4 Expanding (unarchiving) data

Data that is archived cannot be updated or deleted. Therefore, if a need to update or delete archived data arises, you must expand (unarchive) the data. If the frequency of referencing archived data has become higher, consider whether you need to unarchive the data.

The following figure shows an overview of unarchiving data by using the chunk archiving function.

Figure 2‒56: Unarchiving data by using the chunk archiving function

Explanation

In the preceding figure, the data in Chunk 2 has been archived.

1. The data is retrieved to Chunk 2 from the corresponding archive file. At this time, an index is also created.

2. When the data is stored in the chunk and an index is created, the archive file is deleted.

The preceding sequence of tasks is called chunk unarchiving. To unarchive a chunk, execute the adbunarchivechunk command.

Note

Data storage and index creation are performed by the data import processing of the adbimport command.

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