![]() Now, the problem is that the archived file has been placed in the RAR Directory as a Source location (FileCompress\Source Directory). As a result, the file is successfully archived with the RAR extension with just a 31 KB size. Here, the “a” is a parameter to add a file for Archive. ![]() xp_cmdshell '""C:\Program Files\WinRAR\Rar.exe" a "V:\FileCompress\Destination Directory\1109_ " "V:\FileCompress\Source Directory\1109_ ""' The command can be segregated into four distinctive parts, Utility Path, WinRAR parameter, Destination Address, and Source Address:ĮXEC master. ![]() When adding a file to the archive, WinRAR supports the “a” parameter within the command statement. Open a CMD using SQL Server xp_cmdshell and use different parameters to compress the files You can also use other open-source Windows utilities in a similar manner: Windows does not come with a command-line zip program, so I recommend the zip utility, WinRAR, which includes a command-line executable and supports many various archive file types. You may ask, couldn’t the users still overload your system? Yes, but you can get around this issue by using streaming, which can be done with the zip files you create. You could read up on xp_cmdshell, but you’ll still have a large zip file coming back to your server in that model. You can use a stored procedure to create the zip files however, you would be writing T-SQL which writes files to disk and executes Windows system commands as well. If the user does have permission to perform this action, it will return an affirmative response.Ĭompress file or group of files with ZIP or RAR If a user does not have adequate permission to execute the above code, then it will return an error: “User does not have permission to perform this action”. Using the above T-SQL command, we can enable the xp_cmdshell to use further Windows commands inside SQL Server. A database administrator or system administrator can enable the use of ‘ xp_cmdshell‘ by using sp_configure in SQL Server. SQL Server can block access to procedure ‘ sys.xp_cmdshell‘ by component ‘ xp_cmdshell‘ because this component is turned off as part of the security configuration. In this case, the output of this command must be returned to the calling routine as rows of text. This stored procedure allows you to pass the operating system commands directly to the Windows command shell with the help of T-SQL code. Looking at it closely, we see that it is an extended stored procedure, provided by Microsoft and stored in the master database. In this article, we’ll show you how to use T-SQL fundamentals to compress files to achieve various output requirements using xp_cmdshell (T-SQL) in SQL Server.Ī generated Windows command shell is passed in a string for execution by SQL Server. If bandwidth is limited, creating a ZIP or RAR file will allow faster downloads and will reduce the chance of data corruption. ![]() ![]() If you use a Linux operating system with SQL Server, you may want to use the Unix zip command-line tool to manage these files. The most modern operating systems, including Microsoft Windows, MAC OS, and Unix/Linux, can handle ZIP files. The ZIP or RAR command compresses one or more files and bundles them into a single file. The prevalent way to store and share sets of multiple files is to use the ZIP or RAR file format. While download time depends on the end user’s internet bandwidth, it is much more dependent on the server side’s configured resources: If the file size is much larger than needed, it will take longer to download. This requires more server-side resources, such as CPU, memory, file system, etc., and may cause issues on the end-user side. While typically the size of the file depends on the amount of data that is exported, when furnishing to domain-specific, the size of the data export will be larger in size than normal. Microsoft SQL Server offers the ability to export data into CSV, Excel, PDF and other formats with the help of xp_cmdshell in T-SQL. ![]()
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