How to Resolve Microsoft SQL Server Error 5123

The solutions on this page apply to resolve Error 5123, which occurs when access is denied or database attachment fails in MS SQL Server 2014/2012/2008 R2/2005.

When attempting to attach a database in SQL Server, you might encounter an error message displaying "Microsoft SQL Server, Error: 5123," as shown below:

You will be unable to access the SQL Server database. Please refer to the list of causes for SQL Error 5123. If your issue matches one of the listed reasons, proceed to read further to find a solution and fix this error:

• Database attach failed: Attaching and detaching database data files with multiple different logins.
• Access denied: Attempting to attach a database located in a different location without sufficient folder permissions, or without appropriate execute permissions on the program files.

While many seasoned administrators are familiar with how to fix SQL Server error 5123, there is still a need to know better and more efficient ways to repair and resolve a greater number of SQL Server database issues. Read on to learn how you can fix the SQL Server 5123 error on your own.

Manual Way to Resolve MS SQL Server Error 5123

By following the manual steps outlined below, you can quickly resolve the Microsoft SQL Server Error 5123:

1. Step 1: Launch SQL Server, and right-click on the MDF or NDF file you intend to attack. 2. Step 2: Select "Properties" to examine the permissions of the .mdf or .ndf file. 3. Step 3: Click on "Add" to grant login privileges during the login process and gain full control.

Alternatively, you can try running the program “as administrator” to gain privileges, rather than granting them to a new user.

Recommended tools to fix SQL Server Error 5123

If you use Microsoft SQL Server Management Studio (SSMS) or Transact-SQL (T-SQL) to configure and manage your SQL Server, you can use either of these tools to resolve error 5123.

In addition, you may seek assistance from any third-party MS SQL Recovery tool.

"Repairing SQL Error 5123 using SSMS"

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Then you can view all the attached database files again in MS SQL Server.

If the application prompts you that the MDF file is corrupted, do not panic, click here and immediately use the MS SQL Recovery tool to repair corrupted MDF file.

Resolving MS SQL Error 5123 with T-SQL

With the SQL Server sp_attach_db stored procedure, you can easily attach all the required databases to your SQL.

Here is the detailed process of attaching an SQL Server database: 1. **启动SQL Server Management Studio (SSMS)**: 首先，确保你已经安装了SQL Server Management Studio。如果没有，可以从Microsoft官方网站下载并安装。 2. **连接到SQL Server实例**: 打开SSMS后，点击"Connect to Server"（或"连接到数据库引擎"），在弹出的窗口中填写以下信息： - **服务器类型**: 选择"Database Engine"。 . **服务器名称**: 输入你的SQL Server实例名。可能是".\SQLExpress"或"localhost"，或者如果你有特定的命名实例，如"YourServerName\InstanceName"。 - **身份验证**: 选择适当的验证方式，通常为"Windows Authentication"（使用你的Windows账户登录）或"SQL Server Authentication"（需要输入用户名和密码）。 - 点击"连接"按钮。 3. **附加数据库**: 连接到SQL Server后，展开"数据库"节点。右键单击它，然后选择"附加"。 4. **选择数据库文件**: 在"附加数据库"对话框中，点击"添加"按钮。浏览找到你要附加的.mdf主数据文件。通常，这些文件位于"C:\Program Files\Microsoft SQL Server\MSSQL1x.MSSQLServer\MSSQL\Data\"目录下（这里的'x'代表你的SQL Server版本号）。 5. **检查日志文件（可选）**: 如果你的数据库有对应的.ldf日志文件，也可以在这里添加。不过，如果日志文件丢失或不可用，SQL Server通常会自动创建一个新的。 6. **确认设置并附加**: 确认所有需要附加的数据库文件都在列表中，然后点击"确定"。系统将开始附加数据库，并在成功后显示在"数据库"列表中。 7. **验证附加**: 为了确保数据库已成功附加，可以在"数据库"列表中找到并展开它，查看其表和其他对象是否完整。 请根据你的具体环境和需求调整上述步骤。如果你遇到任何问题，可能需要查看SQL Server的错误日志或寻求专业帮助。

- sp_attach_db - [@dbname=] 'dbname' - [@filename1=] 'filename_n' [ ,…16 ] - [@dbname=] – Specifies the name of the database to be attached to the server. - [@filename1=] – 'filename_n' is the physical name of the database file, including the path.

Fix SQL Error 5123 with T-SQL

Resolving MS SQL Error 5123 with SQL Server Recovery Tools

If the above methods fail to effectively resolve the Attach Database Error 5123 in SQL, you can seek help from a reliable SQL Server Recovery tool. It can assist you in repairing corrupt MDF and NDF files in SQL Server and deal with other intricate database corruption issues. The software, with its user-friendly interface, makes SQL Server repair an easy task for any user.

Note In most cases, the SQL Server Recovery Tool can fix this problem. However, if it fails in rare instances, contact the Microsoft Customer Support team.

Step 1: Run the SQL Recovery tool.

Step 2: Select MDF/NDF File: Click on 'Browse' or 'Search' to locate the MDF or NDF file > Click on 'Repair'.

Step 3: Select the database objects to restore: After the scan is complete, select the database objects you want to restore and click Export.

Select Database Objects

Step 4. Export the database to another database, or export selected items as a SQL script. If you choose "Export to Database," you must provide the necessary information and select the target database, which can be a new or existing one.

Hence, we recommend you to keep this software handy. Apart from fixing this error, the SQL Server Recovery tool can also be used to resolve other SQL database issues:

• Resolve SQL database corruption issues with 823/824/825 errors
• Restore deleted SQL records
• Repair MDF/NDF files
• Recover ROW and PAGE compressed data
• Free preview of the repaired database (before activation)
• Save repaired files in MS SQL (MDF), HTML, XLS, and CSV formats
• Support for transferring license to another system (one key for three systems)