SQL Optimizer for DB2 ZOS 5.6 - User Guide

MERGESTMT

Denotes the MERGE statement.

This node merges the conditional UPDATE and INSERT operation on a target table or view into one statement.

MIXSCAN

Scan a multiple-index.

MSJOIN

Use to perform a merge join.

NLJOIN

Use to perform a nested loop join.

This join is used to join tables and is represented by a NLJOIN node and right and left subtrees. The inner table is represented by the right subtree and the outer table by the left subtree. Use either a single-index scan, a multiple-index scan, or a table space scan to access both the inner and outer tables. You can also include another join operation with the left subtree.