Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

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Introduction

Business needs often necessitate data migration from a smaller, less secure database to a higher end, faster database server with a more reliable availability. A typical scenario is the migration of data from a desktop sized database such as MS Access or Fox Pro to any other higher end database servers such as MS SQL Server, Oracle, DB2 or SQL Anywhere Server. Most of the database vendors provide tools to migrate from third party to their own database servers. In his three previous articles, the author has described the built-in tools to migrate from MS Access to SQL 2000 Server, SQL Anywhere Server, and from Oracle 10G XE to SQL Anywhere server.

 

In an earlier article on this site, the author showed how you may connect to an MS Access 2003 database and execute SQL statements using the Oracle SQL Developer 1.2 tool. In this tutorial the author shows you how to migrate an MS Access database to an Oracle 10G XE Server delineating all the steps involved in the migration process.

Oracle SQL Developer 1.2 with this latest version is sometimes called the Migration version as it supports migrating data from three vendors (MySQL, SQL Server and MS Access) to an Oracle database. In fact, it has been designed to migrate from more than one version of MS Access. This feature was not available in the version 1.1 of this tool.

Overview of this Tutorial

Like in the earlier article, a simple MS Access 2003 database file will be created with just one table, a query and a linked table. This database file, about 292 KB, will be migrated to Oracle 10G XE database.

Oracle 10G XE, by design, can have just one database on a computer. However, you can have separate applications by having different user schemas. Oracle 10G XE comes bundled with a sample database schema and data which can be accessed by using the credentials, username hr with a password hr. For the purposes of this example a new user will be created and his authentication will be used for creating necessary migration related schemas to be stored in a repository. This will become clear as you follow the various details and the steps.

Once the ‘Repository’ is created then you can begin by capturing the metadata of the source followed by converting the captured source information into Oracle specific model where a mapping between the source data and the Oracle will be accomplished. After this process, you generate the data definition language script which will create the Oracle objects such as tables, views, etc. In the final step these tables will be populated by transferring the data from the source to Oracle 10G XE.

MS Access 2003 Source

An empty MS Access database file TestMigration.mdb is created in the default directory, My Documents. An Employees table will be imported, an Orders table will be linked and a TestQuery based on selecting a few columns of Employees table will be created. The Employees table and the Orders table may be found in the Northwind Database that ships with most of the MS Access versions.

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

Creating a New User in Oracle 10G XE

As described in the overview, the MS Access Database will be migrated to a User schema in Oracle 10G XE, but this requires reating this schema.
Only a user with DBA privileges can create a new user. Open the Homepage of the Oracle 10G XE Server. Login with the credentials you supplied while installing the software where the user is system and the password is what you chose at that time, as shown in the next figure.

 

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

This gives you access to several of the tools that you can use to administer as well as work with database objects. Click on the icon for Administration and follow the drop-downs till you get to the menu item, Create User, as shown in the next figure.

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

Create a new user MigrateAccess with some password that you choose and confirm. Keep the account status unlocked. This uses the default tablespace called USERS. The default user privilege does not include the DBA role but for this example, the DBA is also included by placing a check mark in this selection. Also several other system wide privileges are also granted. Please follow steps described in the earlier article for the details. The next figure shows all the details filled in.

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

After this when you click the Create button you will have created the user, MigrateAccess. When you click the button Create, you will notice that the ‘bread crumb’ will change to Manage Database Users. You will notice that the new user MigrateAccess has been added to the list of users, as shown in the next figure. As no expiry was set for this user in the previous screen, you can notice that there is no expiry shown in the following screen.

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

Now if you logout (remember you logged in as SYSTEM) and login with the new credentials, MigrateAccess/[chosen password] you can access all the tools on the database. Of course, all the objects (tables, views, etc) will be empty.

Creating the Repository to Store Schemas

Migration using this tool requires an Oracle database schema to store the Meta data it collects about the source. You will create a connection from the Oracle SQL Developer to the Oracle 10 XE, in which, you just finished creating a new user schema. This user’s schema is where the repository contents will be stored.

Making a connection to the Oracle

Right click on the Connections node, and from the drop-down menu select New Connection. This brings up the New / Select Database Connection (this has been described in the earlier referenced article) window. It comes up with the default connection to an Oracle database. It even recognizes the local Oracle 10G XE, capturing all its details as shown. You need to provide a Connection Name, a Username and a Password. The connection name is your choice (herein called conMigrate) and the user name and password is the same that was used while creating the new user MigrateAccess. When you click on the button ‘Test’, a (success) status message will be posted to this form above the Help button, as shown in the next figure after a little while, preceded by a little progress window.

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

Now click on the OK button on the New / Select Database Connection window.

This adds the conMigrate connection to the list of Connections as shown in the next figure. Notice that objects are all empty as we discussed earlier.

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

Create Repository

Click on the main menu item Migrate. From the drop-down, click on Repository Management –> Create Repository as shown in the next figure.

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

This brings up the Create Repository window showing the connection conMigrate as shown in the next figure. You may connect or disconnect this from the tool as long as the authentication information is available.

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

Now click on the Create button. This brings up the Installing Repository window which reports the various objects installed and finally shows a message “Repository Built Successfully” as shown in the next figure.

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

Click on the Close button on this window.

Now login to the Oracle 10G XE with the credentials for the user MigrateAccess, and click on the object browser. Now you see all the Tables, Views, etc in the repository as shown.

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

You will notice that either two more windows, named captured and converted models appear below the Connections node in Oracle SQL Developer, or if they are not found in the Connections node, you may find in the submenu of the main menu, View.

The next figure shows the submenus of the View menu.

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

Connect to the Source Database

Right click on the connection node and establish a new connection so that you can connect to the source database, conTestMigration as shown in the next figure. When you click the Test button you will see a message that gets posted to the screen indicating the connection was a success. Click on the Connect button. This adds the conTestMigrate connection to the list of Connections in the navigator window.

Migrating MS Access 2003 Data using the Oracle SQL Developer 1.2

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