Purpose-Function Flow

The diagrams in this section show, for each SQL statement, which purpose functions the database server executes. Use the diagrams to determine which purpose functions to implement in the access method.

The complexity of the purpose-function flow for each statement determines the order in which the statement appears in this section. This section describes the purpose-function interface for the following SQL statements:

• ALTER FRAGMENT Statement Interface
• CREATE Statement Interface
• DROP Statement Interface
• INSERT, DELETE, and UPDATE Statement Interface
• SELECT...WHERE Statement Interface

This section also describes the oncheck Utility Interface.

The following statements result in an additional call to am_open and am_close before the INSERT statement:

CREATE TABLE newtab (...) USING myvti
INSERT INTO newtab VALUES (....)