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Solve SQL Server Cannot Open User Default Database 4064 Problem

Sherry James | Modified: 2020-11-20T07:55:22+00:00

Maintaining the SQL server database and running it be always the first priority of the SQL Administrators. They always try to keep the database in a healthy state by protecting the machine from unnecessary problems and errors. But sometimes the user has to face the SQL server cannot open user default database 4064 error. When the user tries to connect to a computer which runs the MS SQL but failed to specify the login database while establishing a connection. Then the computer uses the default database. Due to the unavailability of the default database the user has to face SQL Server cannot open user default database 4064 issue.

When the SQL server user faces this errors then the data becomes inaccessible. Also, the user is unable to perform the routines operations and it will lead to huge business loss. If you are facing the same issue then this blog will help you to know the main possible reasons for SQL server cannot open user default database 4064 error. And also we will discuss the solutions to fix this problem. Before proceeding to the solutions part let us understand the main causes of this error.

Primary Reasons Behind Cannot Open User Default Database Error 4064

The user has to face this problem when the default database is missing or there is no connection with the default database. The main causes of this error are listed below.

1. When the default database is missing or has been set to offline, detached, or RESTRICTED_USER state the user has to face this error.
2. In case when the database does not have the login account mapped to a user, or the user has been denied access.
3. If the database is in suspect mode or if it is available as a database mirror.
4. In case if the database is in single-user mode and the only available connection is already being used by someone or something else then this might be the reason for this error.

Know How to Fix SQL Server Cannot Open User Default Database 4064 Erro

#Technique 1: Changing the default database in SQL server 2005 and below versions.


Step 1: Press Window + R and type the cmd. Use one of the methods depending on the type of authentication that SQL server login uses.

1. If the SQL server uses the Windows authentication mode to connect to an instance then type the following command in the command prompt.

Sqlcmd E-S instanceName d master

2. If the SQL Server login uses SQL Server authentication mode to connect to the instance then type the following command in the command prompt window


Sqlcmd -S InstanceName -d master -U SQLLogin Password

Important Note:
Instance Name – Name of the SQL server 2005 instance to connect with
SQL login – It is the placeholder for the SQL server whose default database has been dropped.
Password – SQL server login password


Step 2: At the SQLCMD prompt type the following

ALTER LOGIN SQLlogin WITH DEFAULT DATA_BASE = AVAILDBNAME

Note: AVAILDBName is the name for the existing database that can be accessed by the SQL server login in the instance.

Step3: At the sqlcmd the user has to type GO, and then press Enter.

Resolve the Problem SQL Server Cannot Open User Default Database 4064 Error By Using Expert Solution

In most cases by following the above steps the user can repair the database and access it.
But in case if you won’t be able to access the database then you can try to repair the database by using SQL Database Recovery Tool. SQL Server cannot open user default database 4064 error will be easily removed by using this software. This software can easily fix the corruption issues when the inbuilt utilities fail. Also by using this software the user can easily recover database objects like SQL table, stored procedure, triggers, functions, etc. This tool is compatible to recover the data from SQL server 2019 and its below versions.

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Final Words


In this article, we have discussed how to solve SQL server cannot open user default database 4064 error. We have discussed the various reasons for this problem. So to resolve this issue we have given the manual as a well automated solution. If the user doesn’t want to stuck in annoyance then the user can take the help of an automated solution to resolve this issue. For prior evaluation you can download the free trail version of the tool.