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60,403 milliseconds for a Native MS Access execution in comparison to only 538 for SQL Server to process the same (essentially) command from SSMS. You may be wondering why the duration is so high in comparison between the two alternative methods of satisfying the query. What is interesting though is how Microsoft Access handles the transaction on it's close. If you're to total-up the cumulative CPU, reads, and writes for both the native SQL Server command processing and the native MS Access processing the tale is telling enough: SELECT SQL has prepared the statements needed to satisfy the request it then executes the prepared statements via the sp_execute calls: Transact-SQL Query and Native Execution Directly From Microsoft SQL Server Management Studio:īelow is the t/sql query we'll be executing:ĮXEC sp_prepexec output, , N'SELECT "customer_id","customer_name" FROM "dbo"."Customers", 1, 1, 1, 1, 1, 1, 1, 1, 1, 1ĮXEC sp_prepexec output, , N'SELECT "order_id","order_date","customer_id" FROM "dbo"."Orders", 3365, 3366, 3367, 3368, 3369, 3370, 3371, 3372, 3373, 3374 The remainder of this tip will focus on the following query to identify all orders placed prior to January 1, 2009. Next we'll jump back-and-forth between MS SQL Server and MS Access to create identical queries and look at what occurs within the Query Engine in SQL Server to demonstrate the need to use Pass-Through queries when working with MS Access and a non-Jet data engine. Pk_customers_customer_id PRIMARY KEY CLUSTEREDĬREATE TABLE dbo.Orders ( order_id INT NOT NULL IDENTITY ( 1, 1 ), GO CREATE TABLE dbo.Customers ( customer_id INT NOT NULL IDENTITY ( 1, 1 ), SIZE = 5MB, MAXSIZE = 50MB, FILEGROWTH = 10MBĪLTER DATABASE SET RECOVERY SIMPLE SIZE = 20MB, MAXSIZE = UNLIMITED, FILEGROWTH = 10MBįILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA\mssqltips_log.ldf' , In order to demonstrate I've created a sample database, rightly named mssqltips, then created and populated the following tables:įILENAME = N'C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\DATA\mssqltips.mdf' , SolutionĪccess does a fair amount of load-intensive processes when passing requests along to a back-end RDBMS that is not integrated as Jet is with the Access product. The purpose of this tip is to demonstrate what happens inside of SQL Server when it has to process a request formed natively in MS Access versus a pass-through query request received from the same MS Access application. For more background on the subject I suggest reviewing the original tip.
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The query is then passed back to the RDBMS in its native language for execution results being returned back to Access.
#Microsoft access queries code
Just what is a Pass-Through query? It's a construct in Microsoft Access that allows you to code the query text in the language of the back-end relational database management system - be it SQL Server, Oracle, or the like.
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#Microsoft access queries series
By: Tim Ford | Updated: | Comments (2) | Related: More > Microsoft Access IntegrationĪs we continue to discuss Microsoft Access in this series of tips it seemed important to revisit in more detail a tip I produced in 2008 on using Pass-Through Queries inside of Microsoft Access.