SQL server checks and deletes "orphaned users"

1. Goal

Delete orphaned users in sql server data.

2. Description

Recently, many of the company's databases are in the cloud, and some of them are in the cloud. There were many problems during this period, and one of the more disgusting problems was "isolated users". When the database is backed up and restored, it is found that the previous user cannot log in. At first I thought that the login account was not created, and then re-created the login account, and then authorized to the database, at this time an error occurred, saying that the user already exists. I just caught my attention and started searching for this information. It turned out that this was caused by notorious isolated users.

Reference: https://developer.aliyun.com/article/725400

Three, query all isolated users on the database server

Use master
Go
Create Table #Orphans 
 (
 RowID int not null primary key identity(1,1) ,
 TDBName varchar (100),
 UserName varchar (100),
 UserSid varbinary(85)
 )
SET NOCOUNT ON 
 DECLARE @DBName sysname, @Qry nvarchar(4000)
 SET @Qry = ''
 SET @DBName = ''
 WHILE @DBName IS NOT NULL
 BEGIN
 SET @DBName = 
 (
 SELECT MIN(name) 
 FROM master..sysdatabases 
 WHERE
 /** to exclude named databases add them to the Not In clause **/
 name NOT IN 
 (
 'model', 'msdb', 
 'distribution'
 ) And 
 DATABASEPROPERTY(name, 'IsOffline') = 0 
 AND DATABASEPROPERTY(name, 'IsSuspect') = 0 
 AND name > @DBName
 )
 IF @DBName IS NULL BREAK
 
 Set @Qry = 'select ''' + @DBName + ''' as DBName, name AS UserName, 
 sid AS UserSID from [' + @DBName + ']..sysusers 
 where issqluser = 1 and (sid is not null and sid <> 0x0) 
 and suser_sname(sid) is null order by name'
 Insert into #Orphans Exec (@Qry)
 
 End
Select * from #Orphans

Fourth, query the isolated account on a specific database

exec sp_change_users_login 'REPORT'

Note: Create a new query on a specific database

Five, delete a specific orphaned account

drop user "xuser1"

Note: Create a new query on a specific database