The amount of virtual Shared memory that the database server allocates for a sort depends on the number of rows to be sorted and the size of the row, and whether PDQPIORIDY is set for the server.
Increments the row pointer for the next virtual user or, if the end of the file is reached, go back to the beginning of the file and reset the pointer to 1.
为下一位虚拟用户增加行指针或者,如果已经到达文件的末尾,就回到这个文件的起始,使指针重新回到1。
3
To implement a fake fact query subject, either create a one row table in the database or use a virtual table such as SYSDUMMY1 for DB2 or Dual for Oracle.