Chief Product Officer, Ispirer Systems
In the world of business today, the significance of customer data, sales records, or inventory statistics cannot be overstated. It's not a secret that modern businesses operate on the lifeblood that is data. A multitude of database management systems (DBMS), including Oracle, MSSQL, DB2, MySQL, PostgreSQL, and MongoDB are available for businesses to choose from. Among these, Oracle and SQL Server emerge as the most popular options. This article mainly focuses on the critical features of Oracle and SQL Server databases, delves into the ways how to migrate SQL Server to Oracle, and provides an overview of efficient tools for smooth transitions with step-by-step guides on working with them.
SQL Server, a relational database management system, was brought to life by Microsoft in 1889 to contend with Oracle and MySQL databases. Like its counterparts, SQL Server rests on the SQL standard programming language, used widely for interacting with relational databases. SQL Server is tied to Transact-SQL, also known as T-SQL, which represents Microsoft's adaptation of SQL incorporating a set of proprietary programming features.
Oracle Database, often referred to as Oracle RDBMS or just Oracle, is a relational database management system. Conceived by Lawrence Ellison and his team of engineers in 1977, it has since become a staple in the tech industry for its ability to store, manage, and extract data efficiently. Its uniqueness lies in its pioneering approach to enterprise grid computing and data warehousing, setting it apart in the realm of database management. Oracle operates on the PL/SQL language foundation, making it highly productive for programmers to query, manipulate, and modify data within a database.
Switching from T-SQL to Oracle PL/SQL can be a daunting task if migrating manually. However, Ispirer Toolkit can handle it easily with no need to adjust the resulting code. Check out how the tool automates this process: SQL Server to Oracle migration
Oracle DB runs on most major platforms, including Windows, UNIX, Linux and macOS. The Oracle database is supported on multiple operating systems, including IBM AIX, HP-UX, Linux, Microsoft Windows Server, Solaris, SunOS and macOS.
An Oracle database offers the following features to meet the requirements of robust database management:
Data migration from SQL Server to Oracle can be a daunting task for a business. Custom coding is one of the methods to accomplish this, which entails generating unique PL/SQL scripts to facilitate the migration process. However, given its potential for errors and the considerable time required, many businesses opt for other solutions, such as data replication software. These database replication utilities assist in navigating the intricate process of converting data types and transferring data among diverse database systems.
There are several tools in the market that are widely used to transition both a database schema and its data from SQL Server to Oracle. They simplify the complex process and ensure a smooth transition with minimal disruptions to operations.
Migrating data from SQL Server to Oracle is a considerable challenge that organizations face when they choose to change their database systems. The complexity arises due to the inherent differences in the data structures, syntax, and other elements between these two systems. This migration process involves steps like data extraction from SQL Server, transformation of that data to make it compatible with Oracle, and then loading it into the Oracle database. It's critical to ensure data integrity, consistency, and security during this migration. Identifying the right tools as per the specific needs of the migration, and having a well-planned approach, can make this task more controllable and less prone to errors.
For those looking to convert SQL Server to Oracle, the SQL Developer and Ispirer Toolkit come in handy. We'll explore both tools in detail below. These tools facilitate a smooth transition from SQL Server to Oracle. Let's walk through the process of using SQL Developer to migrate an MSSQL database to Oracle.
To create a new database user, perform the steps below:
Note: If you already have a system_orcl connection and a mwrep user, you can skip these steps.
CREATE USER MWREP IDENTIFIED BY mwrep DEFAULT TABLESPACE USERS TEMPORARY TABLESPACE TEMP; GRANT CONNECT, RESOURCE, CREATE SESSION, CREATE VIEW TO MWREP;
Before you can transition from Microsoft SQL Server to Oracle, it's crucial to establish a repository to contain the necessary tables and PL/SQL packages. If you have an existing migration repository and a connection established with mwrep orcl, you can bypass these steps.
Here are the steps to transfer scripts from Microsoft SQL Server over to Oracle SQL Developer:
Make sure to examine the conversion settings at this point. To do this, adhere to the following procedure:
To migrate the captured model into the Oracle schema, adhere to these guidelines:
Here's how to draft an SQL script with DDL statements to create objects in an Oracle Database:
In order to reference the correct format it is essential to set a date format mask for the Offline Data Move scripts, particularly the Oracle SQL*Loader control files. Follow the steps:
Transitioning from Microsoft SQL Server to an Oracle database may not be as complex as one might anticipate. That being said, it is crucial to understand that a complete automatic migration of all objects and syntax is not always feasible and requires manual involvement.
The estimated time needed for manual tasks can be determined by analyzing the Capture Model and determining the quantity, kind, and complexity of objects.
You can use the reports below to estimate your tasks and projects.
Time estimate for:
For data import, follow the guidelines below:
‹prompt› cd ‹location where files are› ‹prompt› oracle_ctl
You unzipped the files, and they are now in the Data directory. A bat file called oracle ctl contains instructions for loading the data. The data is loaded using sqlldr.
The complexity of the database to be transferred can significantly impact the testing phase of a migration project. Presently, Oracle does not provide automatic tools necessary for migrated database validation. Therefore, the preparation and incorporation of this stage into the project plan before the beginning of the migration is crucial.
Your project plan needs to include the following:
Ispirer Toolkit includes two tools for automated migration of both databases and applications: SQLWays Wizard for databases and NglFly Wizard for apps. Based on an intelligent core both tools handle migration of legacy programming languages and outdated databases with up to 100% automation. It has a free demo license that allows users to assess the quality of automated migration within 30 days.
Further we are going to go through the steps of migrating the database with SQLWays Wizard once the toolkit is already installed.
For the toolkit that has already been successfully registered with a valid license, you can specify the project directory. In this directory SQLWays Wizard will generate a project file that will store information about the current migration process. Also on this page you need to specify the Export Directory. The tool puts all the generated files to this directory, such as sql files with converted SQL objects, txt files with data. Bat or sh files with commands are used to import all the files to the target database. To proceed, press “Next”.
Select or create a corresponding ODBC Data Source Name (DSN) that will allow to connect to the database intended for migration. You also need to specify the user and password for the connection, that will be tested after clicking the “Next >” button.
On this page you are to specify the Oracle database, the server and the name of the database itself, as well as the user and password. Also here you need to specify a path to the Bin Directory. It is a folder that contains the target database native utilities.
Select all the objects that need to be converted by drag-and-drop from the left column to the right one. SQLWays Wizard automatically converts all the types of SQL objects, including tables, triggers, functions, views, stored procedures, sequences, etc.
At this step, you can modify the conversion options of DDL and Data. You can specify different options that can be used to optimize the conversion process. In the objects tree, items (database objects) of different levels and types have different available options (e.g. mappings for data types and column names, formats, files, schemas and different types of database objects, etc.).
Review all the settings of SQLWays Wizard.
SQLWays Wizard runs the process of migration in 2 stages: Conversion and Import. During the conversion phase, the tool extracts information about the objects chosen for this migration, converts them and generates the appropriate set of files. During the import phase, the tool tries to create all the converted objects and data in the target database.
Press “Start conversion” to run the conversion process. Information about the conversion process will be displayed dynamically in the “Conversion output” text field. Once the conversion is complete, you can run the import process to create the converted objects in the target database. To do this, click the “Start Import” button. If you want to view information about the import output, please switch to the “Import output” tab.
SQLWays Wizard has an option of starting import automatically. It can be useful for your conversion projects, if you see that it may take a long time due to the large number of objects and their complexity. To enable the option, click the checkbox “Start Import Automatically”.
On the last page of SQLWays Wizard, on the corresponding tabs you can view the Summary, Export and Import reports and statistics. After clicking the “Finish” button the migration configuration will be saved for future launches, and the wizard will be closed.
As you delve into the intricacies of the tool, you'll find that it is user-friendly, as its vast array of settings caters to both simple and complicated projects. This impressive balance of ease-of-use and adaptability makes the tool a robust solution for database migration tasks, turning a daunting task into a well-orchestrated process, and a complex procedure into a seamless, enjoyable experience.
This article explains the key features of MSSQL and Oracle databases, provides an overview of the most popular tools for migration from SQL Server to Oracle and ways to implement such a transition with the most popular solutions.
Ispirer Toolkit is a robust automated tool for managing database and application migrations. This reliable solution provides a number of benefits, for example:
Try Ispirer Toolkit for free with a 30-days trial period and check the effectiveness of automated SQL Server to Oracle migration.