{"id":4526,"date":"2023-03-29T07:00:00","date_gmt":"2023-03-29T04:00:00","guid":{"rendered":"https:\/\/www.dataplatform.gr\/?p=4526"},"modified":"2023-12-04T00:10:46","modified_gmt":"2023-12-03T21:10:46","slug":"pos-prosthetoyme-mia-vasi-dedomenon-po","status":"publish","type":"post","link":"https:\/\/www.dataplatform.gr\/en\/pos-prosthetoyme-mia-vasi-dedomenon-po\/","title":{"rendered":"How do we add a database that has TDE Encryption enabled to a SQL Server Always On Availability Group?"},"content":{"rendered":"

In previous <\/a>article<\/a> we have seen that TDE (Transparent Data Encryption) is the encryption of a database at a physical level. That is, it encrypts data files, log files and backups.<\/p>\n\n\n\n

When a database in SQL Server has TDE (Transparent Data Encryption) enabled, we will see that if we go through a wizard to add it to an Always On Availability Group, it will not allow us:<\/p>\n\n\n\n

\"\"
01<\/figcaption><\/figure>\n\n\n\n

In this article we will see how we can add a TDE-enabled database to an Always On Availability Group.<\/p>\n\n\n\n

<\/p>\n\n\n\n

The example<\/h2>\n\n\n\n

In our example we have created a database with the name demo_tde<\/em>.<\/p>\n\n\n\n

We have created it master key encryption<\/strong><\/em> and certificate <\/strong><\/em>so we can enable TDE SQL Server Instance<\/em>: <\/p>\n\n\n\n

USE master;\nGO\nCREATE MASTER KEY ENCRYPTION BY PASSWORD  = 'Passw0rd'\nGO\n\nCREATE CERTIFICATE tdeCert WITH SUBJECT = 'TDE Certificate'\nGO<\/pre>\n\n\n\n
We have taken backup <\/em><\/strong>the certificate with creation private key<\/strong><\/em>:<\/p>\n\n\n\n
BACKUP CERTIFICATE tdeCert TO FILE = 'C:\\backup\\tde.cer' WITH PRIVATE KEY ( FILE = 'c:\\backup\\tde.pvk' ,  ENCRYPTION BY PASSWORD =  'Passw0rd' ); <\/pre>\n\n\n\n
Then we created one encryption key <\/strong><\/em>which uses this certificate and we activated <\/strong><\/em>the encryption at the base:<\/p>\n\n\n\n
use demo_tde\ngo\nCREATE DATABASE ENCRYPTION KEY\nWITH ALGORITHM = AES_256\nENCRYPTION BY SERVER CERTIFICATE tdeCert;\n\nALTER DATABASE demo_tde\nSET ENCRYPTION ON;\n<\/pre>\n\n\n\n
If we run the following query we will see that the base demo_tde <\/em>is in status Encrypted<\/strong><\/em>:<\/p>\n\n\n\n
SELECT\n[db].name,\n[db].is_encrypted,\n[k].encryption_state,\n[k].percent_complete,\nCASE [k].encryption_state\nWHEN 0 THEN 'Not Encrypted'\nWHEN 1 THEN 'Unencrypted'\nWHEN 2 THEN 'Encryption in progress'\nWHEN 3 THEN 'Encrypted'\nWHEN 4 THEN 'Key change in progress'\nWHEN 5 THEN 'Decryption in progress'\nWHEN 6 THEN 'Protection change in progress '\nELSE 'Not Encrypted'\nEND AS 'Desc'\nFROM\nsys.dm_database_encryption_keys [k]\nRIGHT JOIN\nsys.databases [db] ON [k].database_id = [db].database_id;<\/pre>\n\n\n\n
\"\"
02<\/figcaption><\/figure>\n\n\n\n
<\/p>\n\n\n\n
The footsteps<\/h2>\n\n\n\n
On the primary node<\/h4>\n\n\n\n
As a first step, it is good to have disabled it Transaction Log backup<\/strong><\/em> as if the database is very large and the process is slow, we will need all the Transaction Log backups performed during this time.<\/p>\n\n\n\n
Then we take a full backup of the database:<\/p>\n\n\n\n
BACKUP DATABASE [demo_tde] \nTO DISK = N'C:\\backup\\demo_tde_full_co.bak' WITH STATS = 10;\nGO<\/pre>\n\n\n\n
On the secondary node<\/h4>\n\n\n\n
First we transfer from the primary node to the secondary, the backup of the certificate (C:\\backup\\tde.cer<\/em>), the private key (C:\\backup\\tde.pvk<\/em>) and the database backup (C:\\backup\\demo_tde_full_co.bak<\/em>).<\/p>\n\n\n\n
We create it master key encryption <\/strong><\/em>and we do restore the certificate<\/strong><\/em> with the backup file, the private key and its password:<\/p>\n\n\n\n
USE master;\nGO\nCREATE MASTER KEY ENCRYPTION BY PASSWORD  = 'Passw0rd'\nGO\n\ncreate certificate tdeCert from file ='C:\\backup\\tde.cer' WITH PRIVATE KEY ( FILE = 'c:\\backup\\tde.pvk' ,  DECRYPTION BY PASSWORD = 'Passw0rd'); \nGO\n<\/pre>\n\n\n\n
We restore the database with NORECOVERY<\/code>:<\/p>\n\n\n\n
RESTORE DATABASE [demo_tde] \nFROM DISK = N'C:\\backup\\demo_tde_full_co.bak' WITH NORECOVERY, STATS = 10;\nGO<\/pre>\n\n\n\n
Once completed, we will see that it is in status Restoring...<\/code>:<\/p>\n\n\n\n
\"\"
03<\/figcaption><\/figure>\n\n\n\n
On the primary node<\/h4>\n\n\n\n
Now we go back to the primary node and add the database to the Availability Group with T-SQL:<\/p>\n\n\n\n
*If we already had another replica of the database on another node, we skip this step<\/em><\/p>\n\n\n\n
USE master \nGO\nALTER AVAILABILITY GROUP [DP-AG] ADD DATABASE [demo_tde]<\/pre>\n\n\n\n
On the secondary node<\/h4>\n\n\n\n
Then we go back to the secondary node and declare that the database belongs to this Availability Group:<\/p>\n\n\n\n
USE master\nGO \nALTER DATABASE [demo_tde] SET HADR AVAILABILITY GROUP =  [DP-AG];<\/pre>\n\n\n\n
In case the following message has appeared, ignore it as it means that the database has already been added to the Availability Group:<\/p>\n\n\n\n
Msg 41145, Level 16, State 1, Line 19\nCannot join database 'demo_tde' to availability group 'DP-AG'.  The database has already joined the availability group.  This is an informational message.  No user action is required.\n<\/code><\/pre>\n\n\n\n
Now if we refresh we will see that it is in status Synchronized<\/code> which is also what we want for Synchronous commit<\/em><\/strong>. If we had chosen Asynchronous commit<\/strong><\/em> it should be in status Synchronizing<\/code>:<\/p>\n\n\n\n
\"\"
04<\/figcaption><\/figure>\n\n\n\n
With the following query we can see information about the health status of the database in the Availability Group:<\/p>\n\n\n\n
SELECT ag.name AS [AG_Name], ar.replica_server_name AS [ReplicaServerName], ar.availability_mode_desc AS [AvailabilityMode], adc.[database_name], \n       hars.role_desc as [Role],  drs.synchronization_state_desc as [SynchronizationState], drs.is_commit_participant as [IsCommit], \n       drs.synchronization_health_desc as [SyncHealth],drs.database_state_desc as [DatabaseState],\n       drs.last_commit_time as [Last Commit Update Time]\nFROM sys.dm_hadr_database_replica_states AS drs WITH (NOLOCK)\nINNER JOIN sys.availability_databases_cluster AS adc WITH (NOLOCK)\nON drs.group_id = adc.group_id \nAND drs.group_database_id = adc.group_database_id\nINNER JOIN sys.availability_groups AS ag WITH (NOLOCK)\nON ag.group_id = drs.group_id\nINNER JOIN sys.availability_replicas AS ar WITH (NOLOCK)\nON drs.group_id = ar.group_id \nAND drs.replica_id = ar.replica_id\nINNER JOIN sys.dm_hadr_availability_replica_states hars \nON drs.replica_id = hars.replica_id \nwhere database_name='demo_tde'\nORDER BY ag.name, ar.replica_server_name, adc.[database_name] OPTION (RECOMPILE);<\/pre>\n\n\n\n
\"\"
05<\/figcaption><\/figure>","protected":false},"excerpt":{"rendered":"
In a previous article we have seen that TDE (Transparent Data Encryption) is the encryption of a database at a physical level. That is, it encrypts data files, log files and backups. When a database in SQL Server has TDE (Transparent Data Encryption) enabled, we will see that if we go through a wizard to add it to Always [\u2026]<\/p>","protected":false},"author":1,"featured_media":702,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11,15],"tags":[156,29,65,23,30,492,6,132],"class_list":["post-4526","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-databases","category-ms-sqlserver","tag-always-on-availability-group","tag-databases","tag-high-availability","tag-microsoft","tag-rdbms","tag-replication","tag-sqlserver","tag-tde"],"yoast_head":"\n\u03a0\u03ce\u03c2 \u03c0\u03c1\u03bf\u03c3\u03b8\u03ad\u03c4\u03bf\u03c5\u03bc\u03b5 \u03bc\u03af\u03b1 \u03b2\u03ac\u03c3\u03b7 \u03b4\u03b5\u03b4\u03cc\u03bc\u03ad\u03bd\u03c9\u03bd \u03c0\u03bf\u03c5 \u03ad\u03c7\u03b5\u03b9 \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03b7\u03bc\u03ad\u03bd\u03bf TDE Encryption \u03c3\u03b5 SQL Server Always On Availability Group - DataPlatform.gr<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dataplatform.gr\/en\/pos-prosthetoyme-mia-vasi-dedomenon-po\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u03a0\u03ce\u03c2 \u03c0\u03c1\u03bf\u03c3\u03b8\u03ad\u03c4\u03bf\u03c5\u03bc\u03b5 \u03bc\u03af\u03b1 \u03b2\u03ac\u03c3\u03b7 \u03b4\u03b5\u03b4\u03cc\u03bc\u03ad\u03bd\u03c9\u03bd \u03c0\u03bf\u03c5 \u03ad\u03c7\u03b5\u03b9 \u03b5\u03bd\u03b5\u03c1\u03b3\u03bf\u03c0\u03bf\u03b9\u03b7\u03bc\u03ad\u03bd\u03bf TDE Encryption \u03c3\u03b5 SQL Server Always On Availability Group - DataPlatform.gr\" \/>\n<meta property=\"og:description\" content=\"\u03a3\u03b5 \u03c0\u03c1\u03bf\u03b7\u03b3\u03bf\u03cd\u03bc\u03b5\u03bd\u03bf \u03ac\u03c1\u03b8\u03c1\u03bf \u03ad\u03c7\u03bf\u03c5\u03bc\u03b5 \u03b4\u03b5\u03af \u03cc\u03c4\u03b9 \u03c4\u03bf TDE (Trasparent Data Encryption) \u03b5\u03af\u03bd\u03b1\u03b9 \u03c4\u03bf encryption \u03bc\u03af\u03b1\u03c2 \u03b2\u03ac\u03c3\u03b7\u03c2 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03c3\u03b5 \u03c6\u03c5\u03c3\u03b9\u03ba\u03cc \u03b5\u03c0\u03b9\u03c0\u03ad\u03b4\u03bf. \u0394\u03b7\u03bb\u03b1\u03b4\u03ae \u03c0\u03c1\u03b1\u03b3\u03bc\u03b1\u03c4\u03bf\u03c0\u03bf\u03b9\u03b5\u03af \u03ba\u03c1\u03c5\u03c0\u03c4\u03bf\u03b3\u03c1\u03ac\u03c6\u03b7\u03c3\u03b7 \u03c3\u03c4\u03b1 data files, log files \u03ba\u03b1\u03b9 backups. \u038c\u03c4\u03b1\u03bd \u03bc\u03af\u03b1 \u03b2\u03ac\u03c3\u03b7 \u03b4\u03b5\u03b4\u03bf\u03bc\u03ad\u03bd\u03c9\u03bd \u03c3\u03c4\u03bf\u03bd SQL Server \u03ad\u03c7\u03b5\u03b9 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