Lesson 6: Performing a schema change on the remote database

In this lesson, you modify the remote database to add the new column to the customer table and to change the script version used to synchronize.

Prerequisites

This lesson assumes you have the roles and privileges listed in the Privileges section at the start of this tutorial: Tutorial: Changing a schema using the script version clause.

This lesson assumes you have completed all preceding lessons. See Lesson 1: Creating and configuring the consolidated database.

Task

Start a synchronization schema change. This is required for most schema changes that affect synchronizing tables. This statement changes the script version that is used to synchronize the subscription, and locks the affected table so the schema change can proceed safely.

Execute the following SQL statement on the remote database using the instance of Interactive SQL that is connected to the remote database.

START SYNCHRONIZATION SCHEMA CHANGE
FOR TABLES customer
SET SCRIPT VERSION = 'my_ver2';

Add the new column to the customer table by executing the following SQL statement.

ALTER TABLE customer ADD cell_phone VARCHAR(12) DEFAULT NULL;

Close the schema change, which unlocks the tables.
STOP SYNCHRONIZATION SCHEMA CHANGE;

Results

A synchronization schema change is performed on the remote database.

Next

Proceed to Lesson 7: Inserting data.

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