[damcache logical-file-name boundary-for-reusing-cache-blocks]

Use this command to specify the boundary for reusing unused cache blocks among the cache blocks for a DAM file if the shared memory for the DAM file runs short.

logical-file-name~<identifier of 1 to 8 characters>

Specify the name of the logical file that validates the boundary for reusing cache blocks. You need to define the logical file name specified here using the damfile command beforehand.

boundary-for-reusing-cache-blocks~<unsigned integer>((0-4000000))

Specify the boundary for reusing cache blocks. If you do not specify the boundary for reusing cache blocks, the value specified in the dam_default_cache_num operand in the DAM service definition will be used as the default.

Until the boundary specified here is reached, the DAM service reuses cache blocks by prioritizing blocks from other DAM files over those in the DAM file to be accessed. If the number of cache blocks exceeds the boundary, the DAM service starts to reuse the cache blocks for the DAM file to be accessed. When you specify 0, the DAM service reuses the cache blocks connected to the cache block chain for the DAM file to be accessed, like the usual processing.

• The damcache command is valid only for the logical file that is defined using the damfile command. Therefore, you need to define the target logical file name using the damfile command beforehand. If you specify a boundary for reusing cache blocks before you specify the target logical file using the damfile command, the boundary will not be valid.
• If you do not specify a boundary for reusing cache blocks for a logical file using the damcache command, the value specified in the dam_default_cache_num operand is used as the boundary for reusing cache blocks.
• If you specify the damcache command more than once for a single logical file name, operation is not guaranteed.