To process a select into existing table statement that inserts rows into a proxy table, Adaptive Server uses the Bulk-Library to generate a bulk-copy operation.
However, full logging is not available for regular bulk-copy operations. The BLK_CUSTOM_CLAUSE property enables Adaptive Server to distinguish between ordinary bulk-copy operations and bulk-copy operations that have resulted from an insert into statement affecting a proxy table. Bulk-copy operations that result from such an insert into statement can then be appended with the custom clause specified by the BLK_CUSTOM_CLAUSE property. Adaptive Server can detect this clause and perform full logging.