Transferring SQL Server Database to PostgreSQL
PostgreSQL and Microsoft SQL are both extremely popular database management systems because of rich set of management tools and coding APIs. However, the SQL Server possess a quite limiting licensing policy as well as very expensive cost of ownership whereas, the PostgreSQL comes with a much less limiting license and also, it an open-source application. This is the key point for many organizations and businesses to transfer their databases from SQL Server to PostgreSQL. However, the process of database transfer or migration includes:
– Extract table classifications from the main database in line of DDL SQL statements
– Transform or Convert all of these statements to the destination format and upload directly to the target database
– Move data in the source database into a more reliable storage (for example, csv files)
– Convert the data in line with the destination format and load it to the target database
– Export SQL Server views, stored processes, functions and triggers in form of SQL statements and source code
– Transform these statements and source code to the destination format and upload directly to the target database
From the specification above, you can see that database migration from MS SQL to PostgreSQL needs a lot of efforts when you are carrying out this process manually. Additionally, the risk of losing data or corruption as a result of human factor is very high. So, it is a good idea to make use of an exceptional software created for the purpose of automating the conversion process.
One among this kind of conversion software is the MS SQL to PostgreSQL converter created by Intelligent Converters. Intelligent Converters happens to be a frontier in the software industry since 2001. They specialize in providing solutions that covers database conversion, transfer or migration and synchronization.
MS SQL to PostgreSQL converter achieves outstanding performance of the migration as a result of the direct reading and of writing data which has no middleware components or libraries. It also works with SAAS variations of SQL Server and PostgreSQL such as Azure by Microsoft. This tool offers command line version so that you can easily automate processes and at the same time schedule database transformation.
If you need to move only specific records, the software gives the opportunity to filter data by using the SELECT queries. With this option, it is easy to pick out specific columns and records as well as convert the data prior to converting it into PostgreSQL format. Below are a few ways to which you can easily use this feature to achieve different goals.
1) Filtering records: SELECT * FROM TheTable WHERE UID < 100
2) Select and rename individual columns: SELECT clmn1 AS Name, clmn2 as Phone FROM MyTable
3) Skip NULL values: SELECT * FROM TheTable WHERE Address2 IS NOT NULL
Most time, it is recommended to modify the column type within the resulting database. To do this, the MS SQL to PostgreSQL converter comes with a feature named “custom column mapping”. This feature is a dialog window which enables you to alter name, type, default value and NULL-attribute in any column of table and also rule out specific columns from conversion.
When the target PostgreSQL server rejects remote connection, this software offers substitute to export the data into SQL script. In this process, the source database is exported into a local file that contains SQL-statements to create tables along with indexes and constraints which is later filled with the data.