![]() As their support documentation states, “Information schema views provide an internal, system table-independent view of the SQL Server metadata. Microsoft SQL Server provides an information schema view as one of several methods for obtaining this metadata. Querying the metadata on a data source is the easiest way to determine the makeup of a table if you don’t have an understanding of it already. This tutorial will help solve these problems. Understanding the schema and what tables are in it help to write efficient SQL and helps avoid running queries multiple times just to see if the schema name or column name is correct. If you are dealing with data that is more complex, then the solution is usually to write multiple QueryPairs to cover your test requirements.When writing queries for a database you might be new to, or one that changes often, you might want to run a quick check to find all the tables in a specific database, or the columns in the database, or to search if table or column exists. So, QuerySurge (and the Linked Server!) expects all queries including MDX queries to return 2D resultsets that conceptually look like regular "tables". Important Usage Note: While MDX queries can be elaborate and may return elaborately structured resultsets, QuerySurge is designed to work in a "tabular" world. Note: The OPENQUERY function documentation is available here. Note that the Source query is a regular SQL query directly against a SQL Server instance, while the Target query is an MDX query, issued through the Linked Server via the OPENQUERY function. Once a connection is created, a regular QueryPair can be used to test SSAS data against any other datastore. The Database Engine connection should be configured in QuerySurge like a normal MS SQL Server connection - see the appropriate guide for Windows Authentication or D atabase Authentication. ![]() Note that the query string is limited to 8000 characters in length.įollowing are examples of an MDX query: a) run in Management Studio directly on SSAS, and b) executed through the Linked Server.Ĭonnecting QuerySurge to the Database Engine ![]() The OPENQUERY function takes as arguments the Linked Server name and an MDX query (as a string), and returns a table object that can be manipulated in a SQL SELECT statement like a traditional table. With a Linked Server configured, the Database Engine can now act as a proxy to SSAS by using the T-SQL OPENQUERY function in your SQL. The new Linked Server will appear in the folder.
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