SQL Snapshot worksheet

— snapshots.sql

–1. create a snapshot

USE master;
GO
CREATE DATABASE Credit_Snap
ON  
    (
    NAME = CreditData,
    FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL15.SQL2019\MSSQL\DATA\CreditData.ss'
    ),
    (
    NAME = CreditCatalog,
    FILENAME = 'C:\Program Files\Microsoft SQL Server\MSSQL15.SQL2019\MSSQL\DATA\CreditCatalog.ss'
    )
AS SNAPSHOT OF Credit;

–2. restore database from a snapshot

USE master;
GO
DECLARE @kill VARCHAR(8000) = '';
SELECT @kill = @kill + 'kill ' + CONVERT(VARCHAR(5), spid) + ';'
  FROM master..sysprocesses
 WHERE dbid = DB_ID('Credit')
   AND spid > 50;
EXEC (@kill);
RESTORE DATABASE Credit FROM DATABASE_SNAPSHOT = 'Credit_Snap';

–3. delete snapshot

USE master;
GO
DROP DATABASE Credit_Snap;

— testing

SELECT *
FROM [Credit].[dbo].[member]
WHERE member_no = 22

BEGIN TRAN
UPDATE [Credit].[dbo].[member]
SET Firstname = 'DRY'
WHERE Firstname = 'CRRY'
ROLLBACK TRAN

SELECT aa.*
FROM [Credit].[dbo].[member] aa
JOIN [Credit_Snap].[dbo].[member] bb
  ON aa.member_no = bb.member_no 
WHERE aa.Firstname <> bb.Firstname;

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