43.1.1 Functional overview

When the adbunarchivechunk command is executed, the archived state of chunks can be removed (chunks can be unarchived). You can decompress a compressed chunk by removing its archived state. Removing the archived state of a chunk is called chunk unarchive processing.

When chunk unarchive processing is executed, the target archived chunk data (archive file data) is decompressed and stored in a DB area file. This removes the archived state of the chunk.

The following figure provides an overview of chunk unarchive processing.

Figure 43‒1: Overview of the adbunarchivechunk command

Explanation:

When you execute the adbunarchivechunk command, the target archived chunk data (archive file data) is decompressed and stored in a DB area file. This removes the archived state from the chunk created in the archivable multi-chunk table.

After the storage in the DB area file is processed, the archive file corresponding to the chunk is deleted.

Note that multiple chunks can be unarchived during one execution of the adbunarchivechunk command. When multiple chunks are unarchived, the storage processing and deletion processing is repeated as many times as the number of chunks.

For details about unarchiving chunks, see Expanding (unarchiving) data in Chunk archiving function (compressing data in a chunk) in the HADB Setup and Operation Guide.

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