Lesson 6: Performing a schema change on the remote database

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

 Perform a schema change on the remote database

  1. 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';

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

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

  3. Close the schema change, which unlocks the tables.

    STOP SYNCHRONIZATION SCHEMA CHANGE;

  4. Proceed to Lesson 7: Inserting data in the remote database.

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