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Oracle Migration Workbench- Part Three

Expert SQL Server Tips by Steve Callan

November 22, 2004

Oracle Migration Workbench - Part Three

By Steve Callan

At the end of Part Two, we finished loading data from the MySQL database into the Oracle database/repository. The owner of the imported data was root, the privileged owner in the MySQL database "omwb." In Part Three, we will go into more detail about the Migration Workbench console and learn how to configure some options. At the end of this article, we will start our preparation for using OMWB to migrate a SQL Server 2000 database.

What's in Oracle Migration Workbench?

With Migration Workbench, like most Oracle products, once you dig into the documentation, you will find a lot of useful information. Several interesting features include the installation/deinstallation process, enabling the use of a browser other than Internet Explorer, quick access to documentation, and customizing/viewing the migration log.

With the 10g version of OMWB, installation (in case you have not already done it) is very straightforward. Download the utility and unzip it. That is about as simple as it gets. If installing OMWB on user-type PC's, you may need to perform the installation as a member of the administrator group, but that is true of many PC's where regular users do not have install software privileges.

A quick mention of Windows administration: user installs are controlled via a group policy, and the Group Policy editor is accessed via Start>Run>gpedit.msc. You do not normally see the Group Policy console, and the gpedit.msc command is but one way to access it. Note the next to last setting in the list -- change the state via right click Properties.

Does uninstalling Migration Workbench require use of the Oracle Universal Installer? The answer is: it depends on which version of OMWB you are using. With version 10g, all you need to do is delete the OMWB install directory. With version 9.2.0.16 or earlier, you need OUI.

Migration Workbench comes with a product overview or Quick Tour (found under the Help menu). If you are a non-Internet Explorer type of person, you can tell OMWB which browser to use. For example, to use Netscape, all you have to do is edit the state.properties file found in the bin directory. The file generally looks like this after installation (substitute username, host, port, and SID as necessary):

UseDefaultRepository=0
Username=tiger
Host=localhost
Port=1521
SID=db00
BROWSER_PATH=

To set Netscape as your browser of choice to see the Quick Tour's HTML pages, supply the path to the browser executable (no quotation marks needed):

UseDefaultRepository=0
Username=tiger
Host=localhost
Port=1521
SID=db00
BROWSER_PATH=C:\Program Files\Netscape\Netscape\Netscp.exe

To confirm this, start OMWB and enter the Quick Tour.

The Help menu on the Migration Workbench console is probably the best help menu from Oracle.

Notice that the list of options contains a link to the MySQL Reference Guide, among other documents. When we cover a SQL Server migration, we will come back here to see if the SQL Server Reference Guide is installed (via HTML pages). The help menu items map to the following Oracle document part numbers/PDF files, which beats having to download these from OTN.

Menu Item

Oracle Part Number (PDF document)

Release Notes

B13978_02

User's Guide

B13852_01

MySQL 3.22/3.23 Reference Guide

B13911_01

Frequently Asked Questions

B10258_01

One last item on the menu to mention is the Online Technical Support. Selecting that option shows the following:

What is noteworthy about this is the amount of support you can get from Oracle -- even if you do not have a CSI. Granted, you probably won't have immediate priority, but what other Oracle products can you name that offer free technical support via email?

A troubleshooting road map can be found at the oracle web site that is pretty useful. In part, it shows:

Finally, one other neat feature of OMWB is the option of customizing the informational items recorded in migration log. The types of messages are found under Tools>Options. The types of messages you can choose to have shown (or hidden) are informational, error, warning, summary, and debug.

In the last article, there was a picture of the migration log. The log showed a detailed list of what took place during the migration. A very nice feature of OMWB is its ability to present the log to you in HTML format, and the reporting is fairly impressive. Access the report via Report>Generate Database Migration Report. The report is fairly well cross-referenced.

The report on the database shows the following.

Drilling down into the report, we can see that the warning previously reported is related to a data type mismatch (kind of).

All I entered for the hiredate was the date, so the loss of more granular information (in this case) is no big deal. If milliseconds matter, then you will want to be sure your source reflects that information. If it is not there to begin with, Oracle certainly cannot divine it (hence, the default time of "12:00:00").


The Oracle Model versus the Oracle database

What is the difference between the Oracle Model and the Oracle database? In a way, you can view the Oracle Model as Oracle's interpretation of what the source database looks like. This interpretation is stored in the repository, and the migration takes that picture and creates the actual Oracle database objects.

The source model is represented in the Source Model pane.


You can then compare it to the Oracle Model, shown by selecting the other tab at the bottom of the console.
 

This visual representation of the schema (the objects, not the actual data) is useful in helping you understand how the source was translated into Oracle. We will see this again with SQL Server.

Getting Started with SQL Server

As mentioned when we entered the MySQL phase, there will be some administrative overhead involved in getting your SQL Server migration environment set up and configured. If this is the first time you have laid hands on SQL Server, you will be amazed at how similar Microsoft's flagship database product is to Oracle. If you are familiar with Oracle's Standard Edition One (appears in the 10g family), you will immediately see how SE1 is geared to compete with SQL Server in the small-to-medium business market. You can read more about SE1 at the Oracle website. 

Where to get SQL Server

Microsoft has a similar setup compared to Oracle. Oracle's OTN is Microsoft's MSDN, but one main difference has to do with downloading Microsoft products. You can get SQL Server off of Microsoft's main site as opposed to the MSDN site (or domain). If you want a CD, you can order that from Microsoft (see the instructions at the bottom of the page). Note that this is only a 120-day license (as opposed to no time limit on Oracle products). Installation is simple, but if you want a step-by-step guide to read before hand, you'll need to invest in a book or two.

SAMS' Teach Yourself Microsoft SQL Server 2000 in 21 Days (Second Edition) takes you through the installation process (and includes numerous screen shots). What I really like about the installation coverage in the book (Day 2) is the section on "Postinstallation: What Did You Get?" If you are familiar with Access, then you will recognize the Northwind database. Because of its popularity in Access, Microsoft includes Northwind with SQL Server. In the SQL Server to Oracle migration process using Migration Workbench, the Northwind database will be the source I will use.

The two critical tasks to get set up for SQL Server are to install it and create a user account on the Northwind database. If you use the SAMS book as a guide, look at Chapter 10 and create a user who has Northwind as his default database (plus grant a healthy dose of privileges for now). If you do not have the book, you can use the online books (Start>Programs>Microsoft SQL Server>Books Online).

Look for Logging In to SQL Server. If you think "Enterprise Manager" and follow what seems logical (keeping in mind how OEM works in Oracle), navigate to the Northwind database users and create a user (you).

Using the Enterprise Manager, add yourself as a user of the Northwind database.

These screenshots show how I created my account using my Windows login account.

You can also use Action>New Database User via the console menu options, and if you want the step-by-step approach, use the Create Login Wizard (via Tools>Wizards).

Once you have a usable account, login via the SQL Query Analyzer, drill down to the Northwind database and try your hand at running a query.

In Closing

This part of the series covered more features of Migration Workbench and helped to get you started on becoming familiar with SQL Server. In the next part, I will go into more detail about SQL Server (how to translate "SQL Server" into "Oracle") and start the migration process for migrating the Northwind database to an Oracle database. Additionally, we will take a quick look at SQL Server's ability to connect to other databases.

 
 
 
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