2.1.2 Relationships among threads used by the adbarchivechunk command

The adbarchivechunk command uses processing real threads in the following processing:

1. Retrieving table data

   One or more processing real threads are used.

2. Compressing data of chunks to be archived

   One or more processing real threads are used.

3. Deleting the data of chunks that were specified when the command was executed

   One or more processing real threads are used.

4. Outputting the progress of command processing

   One processing real thread is used.

Steps 1 and 2 are performed at the same time. Then, step 3 is performed. Step 4 is always performed while steps 1 to 3 are in progress.

The following figure shows the processing of the adbarchivechunk command using processing real threads. The preceding numbers correspond to the numbers in the figure.

Figure 2‒2: Processing of the adbarchivechunk command using processing real threads

The number of processing real threads used by the adbarchivechunk command for each step is automatically calculated from the number of processing real threads to be used by the adbarchivechunk command. For details about the number of processing real threads used by the adbarchivechunk command, see the description of the archive chunk option adb_arcv_rthd_num in (2) Explanation of specification format in 2.2.2 Format of archive chunk options.

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