SQL Optimizer for DB2 ZOS 5.6 - User Guide

CORSUB

Use a correlated subquery for access.

The CORSUB operation provides access by a correlated subquery.

DELCUR

Perform a DELETE WHERE CURRENT OF CURSOR operation.

DELETE

Remove rows from a table or view.

A delete construct contains a DELETE node and one of the following: table space scan, single-index access, or multiple-index access.

DFETCH

Represents a direct fetch data using ROWID.

ROWID is used as a search condition. This is the most efficient was to access a base table if a ROWID-type column is defined within the table.