{"id":76,"date":"2018-08-28T12:38:59","date_gmt":"2018-08-28T12:38:59","guid":{"rendered":"http:\/\/databasefilerecovery.com\/blog\/?p=76"},"modified":"2025-06-17T07:38:33","modified_gmt":"2025-06-17T07:38:33","slug":"fix-sql-server-error-5120","status":"publish","type":"post","link":"https:\/\/www.databasefilerecovery.com\/blog\/fix-sql-server-error-5120\/","title":{"rendered":"How to Fix SQL Server Error 5120: Attach Database Error"},"content":{"rendered":"<p class=\"block_sum\"><em><strong>Summary: <\/strong>SQL Databases often face user-side or server-side errors due to many inconsistencies or other problems. One such common error is the 5120, which is related to the permission issues in attaching the database. This error looks simple, but it creates panic across all SQL databases. So, this guide explains efficient ways and provides a <\/span><a href=\"https:\/\/www.databasefilerecovery.com\/mssql-database-recovery.html\"><strong>SQL Database Recovery Tool<\/strong><\/a><span style=\"font-weight: 400;\"> to fix SQL Server Error 5120.<\/em><span class=\"block_btn\"><a class=\"custom-download-btn\" href=\"https:\/\/www.sysinfotools.com\/demo-version\/SysInfoTools-MS-SQL-Database-Recovery.exe\"><i class=\"icon-windows\"><\/i> Download Now<\/a> <a class=\"custom-buy-btn\" href=\"https:\/\/www.sysinfotools.com\/buynow\/ms-sql-database-recovery.php\"><i class=\"icon-basket\"><\/i> Purchase Now<\/a><\/span><\/p>\n<\/p>\n<h2 class=\"wp-block-heading\">What Caused SQL Database Error 5120?<\/h2>\n<p>The main reason lies in the unauthorized access to MDF\/LDF files. It can be due to the following factors:<\/p>\n<ul>\n<li>The database file is not present at its accurate location.<\/li>\n<li>Unable to open SQL Server Management Studio (SSMS) with administrative rights.<\/li>\n<li>Server drives aren&rsquo;t permitted to store the server files, or are short of storage.<\/li>\n<li>Trying to access the database with a false account or one without admin privileges.<\/li>\n<li>Improper functioning of the SQL database due to corrupted MDF\/LDF files.<\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\">Troubleshoot to Fix SQL Server Error 5120<\/h2>\n<p>We will discuss the manual solutions and the professional tool available to solve this error. Also, notice how the expert utility excels on the freeways without any extra effort or add-ons.<\/p>\n<h3 class=\"wp-block-heading\">Manual Resolve Microsoft SQL Server Error 5120<\/h3>\n<p>There are several manual ways available to reduce the risk and fix the error. All of them are briefly explained one after another. Follow them as stated below:<\/p>\n<h4 class=\"wp-block-heading\">Method 1: Grant Permissions to SQL Service Account<\/h4>\n<ol>\n<li>First, ensure you run <strong>SSMS<\/strong> as an administrator on Windows OS.<\/li>\n<li>Next, from File Explorer, move to the default location of MDF and LDF files.<\/li>\n<li>It is generally <strong>c:\\Program Files\\Microsoft SQL Server\\MSSQL15.MSSQLSERVER\\MSSQL\\DATA<\/strong><\/li>\n<li>Then, locate <strong>MDF\/LDF<\/strong>, right-click it, and choose to open its <strong>Properties<\/strong>.<\/li>\n<li>In the dialog, go to the <strong>Security<\/strong> tab and there press <strong>Edit<\/strong>.<\/li>\n<li>Further, click <strong>Add<\/strong> and input the name of the <strong>SQL Service Account<\/strong> to add.<\/li>\n<li>Afterward, check the box to enable <strong>Full Control<\/strong> and finally, click <strong>OK<\/strong>.<\/li>\n<li>Later, retry to attach the MDF database to the SQL Server.<\/li>\n<\/ol>\n<h4 class=\"wp-block-heading\">Method 2: Fix SQL Server Error 5120 by Enabling Trace Flag<\/h4>\n<p>Sometimes, users save SQL database files in Network-attached storage, and they face this error. So, to resolve it, enable Trace Flag 1802 for network stored MDF files.<\/p>\n<ol>\n<li>Start SSMS and open <strong>SQL Server Configuration Manager<\/strong>.<\/li>\n<li>Then, double-click <strong>SQL Server Services<\/strong> and pick your SQL Server.<\/li>\n<li>In the open <strong>Properties<\/strong> dialog, go to the <strong>Startup Parameters<\/strong> tab.<\/li>\n<li>After that, in the specify parameter box, type <strong>-T1802<\/strong> and click <strong>Add<\/strong>.<\/li>\n<li>Finally, press <strong>Apply<\/strong> and <strong>OK<\/strong> to fix attach SQL database error 5120.<\/li>\n<li>Restart the SQL Service to enable Trace. It has now permissions to directly disable the <strong>Access Control List (ACL)<\/strong>, i.e., attach or detach databases.<\/li>\n<\/ol>\n<h4 class=\"wp-block-heading\">Is Manual Method the Only Solution?<\/h4>\n<p>The manual method is free, but it falls short of the following:<\/p>\n<ul>\n<li>Doesn&rsquo;t work if the MDF file is inaccessible, damaged, or corrupted.<\/li>\n<li>The process can be difficult for users with no or little technical knowledge.<\/li>\n<li>It is possible that the problem isn&rsquo;t limited to granting permissions.<\/li>\n<\/ul>\n<p>So, for such situations, we have a better and more advanced solution that helps take backup and recover data simultaneously.<\/p>\n<h3 class=\"wp-block-heading\">Comprehensive Tool to Fix SQL Server Error 5120<\/h3>\n<p>Since the access denied problems can be caused by damaged and corrupted MDF\/NDF files. They need an immediate fix, and so we bring you the top-notch <strong>SQL Database Recovery Tool<\/strong>. This tool helps to seamlessly <a href=\"https:\/\/www.databasefilerecovery.com\/blog\/attach-mdf-and-ldf-files-in-sql-server\/\"><strong>attach MDF and LDF files in SQL Server<\/strong><\/a> at once. Additionally, it can repair files with any corruption level and restore them with ease. Moreover, the easy-to-use GUI of this software is flexible to all users and works smoothly on all Windows OS without hassle.<\/p>\n<h4 class=\"wp-block-heading\">Resolve Error Code 15023 in SQL<\/h4>\n<ol>\n<li>Launch the automated software after the download on Windows.<\/li>\n<li>Then, click <strong>Open<\/strong> and upload the <strong>MDF<\/strong> for repair and attachment.<\/li>\n<li>Select a recovery mode, either <strong>Standard <\/strong>or <strong>Advanced<\/strong>, and click <strong>OK<\/strong>.<\/li>\n<li>Further, check all the tables, views, records, procedures, etc. in it.<\/li>\n<li>Select the needed ones to attach from the table format preview.<\/li>\n<li>Afterward, press <strong>Save SQL Data<\/strong> and <strong>Server Database<\/strong> from the options.<\/li>\n<li>Finally, input the authentication and <strong>Test the Connection<\/strong>. Click <strong>OK<\/strong> to attach the database.<\/li>\n<\/ol>\n<p>And it&rsquo;s done. The MDF file is repaired and attached to the database as fresh as new.<\/p>\n<h3 class=\"wp-block-heading\">Conclusion<\/h3>\n<p>In this blog, we identified the error message, causes, and ultimate ways to fix SQL Server error 5120. The error is not too difficult to handle and can be resolved easily if you follow the methods correctly. In case you encounter issues with your MDF files, directly use the professional software given, and fix errors effortlessly.<\/p>\n<h4 class=\"faq_heading\">Frequently Asked Questions<\/h4>\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1749901565917\"><strong class=\"schema-faq-question\"><strong>Q1. Why am I getting SQL Database Error 5120 when attaching a database?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> You are probably encountering the error due to file access permissions for MDF\/NDF\/LDF files. It restricts the user from attaching them to the SQL database.\u00a0<br\/><\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1749901621834\"><strong class=\"schema-faq-question\"><strong>Q2. Can I resolve Microsoft SQL Server Error 5120 without SSMS?<\/strong><\/strong> <p class=\"schema-faq-answer\"><strong>Ans:<\/strong> Yes, follow the steps for the SQL Recovery Tool and fix SQL\u00a0 error 5120 in one go:<br\/>1. Run the software and import the <strong>MDF<\/strong> file to fix and attach.<br\/>2. Next, recover the file in any mode and click <strong>OK<\/strong> to preview the data.<br\/>3. Press <strong>Save SQL Data<\/strong>, and further, choose <strong>SQL Server Database<\/strong>.<br\/>4. Finally, set the authentication, test the connection, and click <strong>OK<\/strong>.<br\/><\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Summary: SQL Databases often face user-side or server-side errors due to many inconsistencies or other problems. One such common error<a class=\"read-more ml-1 main-read-more\" href=\"https:\/\/www.databasefilerecovery.com\/blog\/fix-sql-server-error-5120\/\">Read More<\/a><\/p>\n","protected":false},"author":3,"featured_media":2096,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-76","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Fix SQL Server Error 5120: Attach Database Error<\/title>\n<meta name=\"description\" content=\"Explore a complete guide to fix SQL Server Error 5120. 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Why am I getting SQL Database Error 5120 when attaching a database?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans:<\/strong> You are probably encountering the error due to file access permissions for MDF\/NDF\/LDF files. It restricts the user from attaching them to the SQL database.\u00a0<br\/>","inLanguage":"en-US"},"inLanguage":"en-US"},{"@type":"Question","@id":"https:\/\/www.databasefilerecovery.com\/blog\/fix-sql-server-error-5120\/#faq-question-1749901621834","position":2,"url":"https:\/\/www.databasefilerecovery.com\/blog\/fix-sql-server-error-5120\/#faq-question-1749901621834","name":"Q2. Can I resolve Microsoft SQL Server Error 5120 without SSMS?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"<strong>Ans:<\/strong> Yes, follow the steps for the SQL Recovery Tool and fix SQL\u00a0 error 5120 in one go:<br\/>1. Run the software and import the <strong>MDF<\/strong> file to fix and attach.<br\/>2. Next, recover the file in any mode and click <strong>OK<\/strong> to preview the data.<br\/>3. Press <strong>Save SQL Data<\/strong>, and further, choose <strong>SQL Server Database<\/strong>.<br\/>4. Finally, set the authentication, test the connection, and click <strong>OK<\/strong>.<br\/>","inLanguage":"en-US"},"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/www.databasefilerecovery.com\/blog\/wp-json\/wp\/v2\/posts\/76","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.databasefilerecovery.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.databasefilerecovery.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.databasefilerecovery.com\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.databasefilerecovery.com\/blog\/wp-json\/wp\/v2\/comments?post=76"}],"version-history":[{"count":1,"href":"https:\/\/www.databasefilerecovery.com\/blog\/wp-json\/wp\/v2\/posts\/76\/revisions"}],"predecessor-version":[{"id":2097,"href":"https:\/\/www.databasefilerecovery.com\/blog\/wp-json\/wp\/v2\/posts\/76\/revisions\/2097"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.databasefilerecovery.com\/blog\/wp-json\/wp\/v2\/media\/2096"}],"wp:attachment":[{"href":"https:\/\/www.databasefilerecovery.com\/blog\/wp-json\/wp\/v2\/media?parent=76"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.databasefilerecovery.com\/blog\/wp-json\/wp\/v2\/categories?post=76"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.databasefilerecovery.com\/blog\/wp-json\/wp\/v2\/tags?post=76"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}