DML Statement
Using Database Macros
The Stream operator uses macros to modify tables rather than actual DML statements. Before beginning a load, the operator creates macros to represent the DML statements. The macros are then iteratively executed in place of the DML statements. The Stream operator also removes the macros after all rows are loaded.
These actions are accomplished through the use of CREATE/DROP MACRO SQL statements.
Use the MacroDatabase attribute to specify the database that contains the macros created by the Stream operator. If not specified, the database used is the database that contains the Restart Log table.
Multiple Statement Requests
The Stream operator sends conventional CLIv2 parcels to the Teradata Database that are immediately applied to the target table(s). To improve efficiency, the Stream operator builds multiple statement requests and may also employ a serialize mechanism to help reduce locking overhead.
The most important technique used by the Stream operator to improve performance is the multiple statement request. Placing more statements in a single request is beneficial for two reasons. It reduces:
The Stream operator packs multiple statements into a request based upon the Pack attribute specification.