Where SQL Server stores your login credentials

SQL Server usernames and passwords are not stored in one central place the way your email password might be. Instead, they live in the SQL Server instance itself — the database software running on your computer or a remote server. If you set up SQL Server yourself, you chose the username and password during installation. If someone else set it up, or if you inherited the server, you will need to recover or reset those credentials.

The method you use depends on three things: whether you remember any password at all, whether you have administrator access to the machine running SQL Server, and whether the server uses Windows authentication or SQL Server authentication (or both).

Key Takeaways

  • SQL Server usernames and passwords are stored in the SQL Server instance itself, not in a separate file you can read.
  • If you have administrator access to the Windows machine running SQL Server, you can reset the sa (system administrator) account password without knowing the old one.
  • Windows authentication uses your computer login instead of a separate SQL Server password, so you may not have a password to find at all.
  • SQL Server Management Studio is the standard tool for viewing and managing usernames and passwords once you are logged in.
  • If you cannot log in and do not have Windows administrator access, you will need to contact whoever manages the server.

Check whether you are using Windows authentication or SQL Server authentication

Open SQL Server Management Studio (the graphical tool that comes with SQL Server). When the login window appears, look at the "Authentication" dropdown at the bottom. If it says "Windows Authentication," you log in using your Windows username and password — there is no separate SQL Server password to find. If it says "SQL Server Authentication," you need a username and password specific to SQL Server.

If you are not sure which one your server uses, try Windows Authentication first. If that fails, switch to SQL Server Authentication and try the username "sa" (the default system administrator account) with a blank password or a password you remember from setup.

Reset the sa password if you have Windows administrator access

The "sa" account is SQL Server's built-in system administrator. If you have administrator rights on the Windows machine running SQL Server, you can reset the sa password even if you do not know the current one. Stop the SQL Server service, restart it in single-user mode, connect with administrator privileges, and change the password.

The exact steps vary by SQL Server version, but the process is: open Services (services.msc on Windows), find "SQL Server (MSSQLSERVER)" or the name of your instance, right-click it, and select Properties. In the "Start parameters" field, add -m to start in single-user mode. Restart the service. Then open Command Prompt as administrator and use sqlcmd to connect and run an ALTER LOGIN command to set a new password. After you change the password, remove the -m flag and restart the service normally.

This method only works if you have Windows administrator access to the machine. If you do not, you cannot reset the password without help from someone who does.

View existing usernames once you are logged in

If you can log in to SQL Server Management Studio, you can see all usernames on that instance. Expand the server name in the left panel, then expand "Security," then click "Logins." The list shows every username that can connect to this SQL Server instance. Right-click any login and select "Properties" to see details like the authentication type and which databases that user can access.

You cannot see the actual password from this view — SQL Server stores passwords as hashed values, not readable text. But you can reset any password if you have administrator rights. Right-click the login, select "Properties," click "General," and enter a new password in the "Password" field.

Check your installation notes and email

If someone else installed SQL Server on your machine, they may have sent you the credentials in an email or written them down. Search your email for "SQL Server," "sa password," or the name of the server. Check any documentation or setup notes that came with the server. If the server was installed by your company's IT department, contact them — they will have a record of the credentials.

If you installed SQL Server yourself, check any setup files or installation logs on your computer. During installation, SQL Server asks you to choose authentication mode and set the sa password. If you chose "Mixed Mode" (both Windows and SQL Server authentication), you set that password at that time.

Contact your hosting provider or IT department

If the SQL Server is on a remote machine you do not own, or if you do not have administrator access to the machine where it runs, you cannot reset the password yourself. Contact whoever manages the server — your hosting provider, your company's IT department, or the person who set it up. They can reset the password or create a new username for you.

When you contact them, have the server name or IP address ready, and let them know whether you need access to a specific database or the whole instance. They will ask for verification that you have the right to access that server before they give you new credentials.

Frequently Asked Questions

Can I see the actual password if I know the username?

No. SQL Server stores passwords as hashed values, which are one-way encrypted. Even administrators cannot read the original password. You can only reset it to a new password that you choose.

What is the difference between sa and other usernames?

The sa account is the system administrator and has full control over the entire SQL Server instance. Other usernames can be restricted to specific databases or specific actions. If you need to manage the server, you need sa or another account with sysadmin rights.

What if I forgot the Windows password for the machine running SQL Server?

You will need to reset your Windows password first. That is a separate process from SQL Server. Once you can log in to Windows as an administrator, you can then reset the SQL Server sa password using the single-user mode method described above.

Can I use the same username and password for multiple SQL Server instances?

Each SQL Server instance has its own set of usernames and passwords. A username that works on one instance will not automatically work on another. You can create the same username on multiple instances, but you must set the password separately for each one.

What should I do if I think someone else knows my SQL Server password?

Change it when ready. Right-click the username in SQL Server Management Studio, select Properties, and enter a new password. If you suspect unauthorized access, also check the SQL Server error logs to see if anyone has tried to log in with that account.