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One of the leading US healthcare organizations needed to upgrade their health record system in an effort to drive down costs while enabling new capabilities. We proposed to migrate the Oracle database to SQL Server to build a scalable and secure architecture. We faced a number of Oracle to SQL Server migration challenges, including the huge volume of data along with very large tables aggregated in the original database. As a result, the customer got the modern, secure, platform while saving […]

Have you ever asked yourself, wouldn’t it be cool if I had a smartphone application that would show me how a piece of equipment will look on my shop floor before buying? We’re proud to introduce you to an augmented reality iOS application developed by DB Best. This application displays a selected 3D model of production equipment on the screen of iPhone or iPad, adding it to the live camera picture. So, you can explore, how the machinery will fit […]

Oracle’s SELECT INTO statement with BULK COLLECT clause allows you to retrieve an entire result set and store it in a PL/SQL collection type variable in a single operation. This approach allows to avoid the use of a loop statement to retrieve one result row at a time, thus making the code compact and effective. MySQL doesn’t support the BULK COLLECT INTO operation, so, SCT can not convert the source Oracle code correctly. When you try to convert the source […]

Migrating data warehouses to Amazon Redshift represents a serious challenges when you consider what it takes to transfer huge amounts of data in parallel. On February 16, 2017, Amazon released version 1.0.600 of AWS Schema Conversion Tool (SCT). This release brings the support of Data Migration Agents. Now you can effectively extract data from Oracle and Teradata data warehouses and prepare it for use with Amazon Redshift. In the following video, we will demonstrate the typical workflow of using the […]

Oracle 11g introduced pivot operation that allows writing cross tabulation (also called transposed, crosstab and matrix) queries that rotate rows into columns and aggregate results. Pivot rotates a table-valued expression by turning the unique values from one column in the expression into multiple columns in the output and performs aggregations where they are required on any remaining column values that you want to get in the final output. SQL Server Migration Assistant (SSMA) for Oracle cannot correctly parse the pivot […]

Oracle allows you to create foreign key for table using columns with different data types. But SQL Server Migration Assistant (SSMA) for Oracle cannot convert them to SQL Server correctly because SQL Server doesn’t support the foreign keys that use columns with different data types. So, when you try to convert the original code that includes the foreign key with the columns of different data types, SSMA will generate the following error message: «Error O2SS0231: Foreign keys with different types […]

Oracle 9i introduced the predefined SYS_REFCURSOR type meaning we no longer have to define our own REF CURSOR types. SQL Server doesn’t support SYS_REFCURSOR type and doesn’t have a direct equivalent for it. Thus, SQL Server Migration Assistant (SSMA) for Oracle converts SYS_REFCURSOR variables into varchar (8000) and generates the appropriate warning message: «Warning O2SS0259: Cursor type was converted to varchar». Oracle’s SYS_REFCURSOR type allows returning recordsets from stored procedures and functions. For example, a procedure can open a cursor […]

Oracle’s table functions allow you to define a set of PL/SQL statements that will, when queried, behave just as a regular query to the table. You may use the table function to manipulate the individual elements of a collection (user-defined object types) in your SQL code. The problem is that SQL Server Migration Assistant (SSMA) for Oracle can not convert table function and generates a set of errors: O2SS0474: Conversion of user defined type variable is not supported and is […]

Welcome to our blog post series covering the typical conversion errors of SQL Server Migration Assistant (SSMA). DB Best has a vast experience in database migration, so, we constantly encounter these errors and found the solutions for most of them. We will devote one blog post per common error message that may occur during database migration with SSMA. Each blog post contains a problem statement and our recommendation on how to fix it correctly. Related posts Below you can find the table of contents […]

Oracle’s NumToDSInterval function converts the provided number value of specified time units or expression to an interval day to second literal. Usually, we use the interval values when dealing with dates. PostgreSQL provides some support for intervals but does not support storing values of such kind in variables. Hence, there are no functions in PostgreSQL able to return interval values.We commonly use the functions working with date intervals in reporting and other type of queries. So, when you try to […]