Variables without documentation on InfoCenter
DB2_TRUST_MDC_BLOCK_FULL_HINT, DB2_MDC_MAX_CACHE_SIZE
Both variables improve INSERT performance into MDC tables:
DB2_TRUST_MDC_BLOCK_FULL_HINT speeds up the search for a block containing free space for large MDC cells. It was added after we experienced a performance degradation when loading very large InfoPackages into PSA (resulting in very large MDC cells because MDC is defined on REQUEST).
DB2_MDC_MAX_CACHE_SIZE improves performance when inserting unsorted data into many MDC cells.