Microsoft sql server ошибка 9002

SET NOCOUNT ON
DECLARE @SQL VARCHAR (8000), @log_reuse_wait tinyint, @log_reuse_wait_desc nvarchar(120), @dbname sysname, @database_id int, @recovery_model_desc varchar (24)


IF ( OBJECT_id (N'tempdb..#CannotTruncateLog_Db') is not null)
BEGIN
    DROP TABLE #CannotTruncateLog_Db
END


--get info about transaction logs in each db. Use a DMV which supports all supported versions

IF ( OBJECT_id (N'tempdb..#dm_db_log_space_usage') is not null)
BEGIN
    DROP TABLE #dm_db_log_space_usage 
END
SELECT * INTO #dm_db_log_space_usage FROM sys.dm_db_log_space_usage where 1=0

DECLARE log_space CURSOR FOR SELECT NAME FROM sys.databases
OPEN log_space 

FETCH NEXT FROM log_space into @dbname

WHILE @@FETCH_STATUS = 0
BEGIN

	set @SQL = '
	insert into #dm_db_log_space_usage (
	database_id, 
	total_log_size_in_bytes, 
	used_log_space_in_bytes, 
	used_log_space_in_percent, 
	log_space_in_bytes_since_last_backup
	)
	select
	database_id, 
	total_log_size_in_bytes, 
	used_log_space_in_bytes, 
	used_log_space_in_percent, 
	log_space_in_bytes_since_last_backup
	from ' + @dbname +'.sys.dm_db_log_space_usage'

	
	BEGIN TRY  
		exec (@SQL)
	END TRY  

	BEGIN CATCH  
        SELECT ERROR_MESSAGE() AS ErrorMessage;  
	END CATCH;

	FETCH NEXT FROM log_space into @dbname
END

CLOSE log_space 
DEALLOCATE log_space 

--select the affected databases 
SELECT 
    sdb.name as DbName, 
    sdb.log_reuse_wait, sdb.log_reuse_wait_desc, 
    log_reuse_wait_explanation = CASE

        WHEN log_reuse_wait = 1 THEN 'No checkpoint has occurred since the last log truncation, or the head of the log has not yet moved beyond'
        WHEN log_reuse_wait = 2 THEN 'A log backup is required before the transaction log can be truncated.'
        WHEN log_reuse_wait = 3 THEN 'A data backup or a restore is in progress (all recovery models). Please wait or cancel backup'
        WHEN log_reuse_wait = 4 THEN 'A long-running active transaction or a defferred transaction is keeping log from being truncated. You can attempt a log backup to free space or complete/rollback long transaction'
        WHEN log_reuse_wait = 5 THEN 'Database mirroring is paused, or under high-performance mode, the mirror database is significantly behind the principal database. (Full recovery model only)'        
        WHEN log_reuse_wait = 6 THEN 'During transactional replication, transactions relevant to the publications are still undelivered to the distribution database. Investigate the status of agents involved in replication or Changed Data Capture (CDC). (Full recovery model only.)'        

        WHEN log_reuse_wait = 7 THEN 'A database snapshot is being created. This is a routine, and typically brief, cause of delayed log truncation.'
        WHEN log_reuse_wait = 8 THEN 'A transaction log scan is occurring. This is a routine, and typically a brief cause of delayed log truncation.'
        WHEN log_reuse_wait = 9 THEN 'A secondary replica of an availability group is applying transaction log records of this database to a corresponding secondary database. (Full recovery model only.)'
        WHEN log_reuse_wait = 13 THEN 'If a database is configured to use indirect checkpoints, the oldest page on the database might be older than the checkpoint log sequence number (LSN).'
        WHEN log_reuse_wait = 16 THEN 'An In-Memory OLTP checkpoint has not occurred since the last log truncation, or the head of the log has not yet moved beyond a VLF.'
    ELSE 'None' END,

    sdb.database_id,
    sdb.recovery_model_desc,
    lsu.used_log_space_in_bytes/1024 as Used_log_size_MB,
	lsu.total_log_size_in_bytes /1024 as Total_log_size_MB,
    100 - lsu.used_log_space_in_percent as Percent_Free_Space
INTO #CannotTruncateLog_Db
FROM sys.databases AS sdb INNER JOIN #dm_db_log_space_usage lsu ON sdb.database_id = lsu.database_id
WHERE log_reuse_wait > 0

SELECT * FROM #CannotTruncateLog_Db 


DECLARE no_truncate_db CURSOR FOR
    SELECT log_reuse_wait, log_reuse_wait_desc, DbName, database_id, recovery_model_desc FROM #CannotTruncateLog_Db;


OPEN no_truncate_db

FETCH NEXT FROM no_truncate_db into @log_reuse_wait, @log_reuse_wait_desc, @dbname, @database_id, @recovery_model_desc

WHILE @@FETCH_STATUS = 0
BEGIN
    if (@log_reuse_wait > 0)
        select '-- ''' + @dbname +  ''' database has log_reuse_wait = ' + @log_reuse_wait_desc + ' --'  as 'Individual Database Report'


    if (@log_reuse_wait = 1)
    BEGIN
        select 'Consider running the checkpoint command to attempt resolving this issue or further t-shooting may be required on the checkpoint process. Also, examine the log for active VLFs at the end of file' as Recommendation
        select 'USE ''' + @dbname+ '''; CHECKPOINT' as CheckpointCommand
        select 'select * from sys.dm_db_log_info(' + CONVERT(varchar,@database_id)+ ')' as VLF_LogInfo
    END
    else if (@log_reuse_wait = 2)
    BEGIN
        select 'Is '+ @recovery_model_desc +' recovery model the intended choice for ''' + @dbname+ ''' database? Review recovery models and determine if you need to change it. https://learn.microsoft.com/sql/relational-databases/backup-restore/recovery-models-sql-server' as RecoveryModelChoice
        select 'To truncate the log consider performing a transaction log backup on database ''' + @dbname+ ''' which is in ' + @recovery_model_desc +' recovery model. Be mindful of any existing log backup chains that could be broken' as Recommendation
        select 'BACKUP LOG [' + @dbname + '] TO DISK = ''some_volume:some_folder' + @dbname + '_LOG.trn ''' as BackupLogCommand
    END
    else if (@log_reuse_wait = 3)
    BEGIN
        select 'Either wait for or cancel any active backups currently running for database ''' +@dbname+ '''. To check for backups, run this command:' as Recommendation
        select 'select * from sys.dm_exec_requests where command like ''backup%'' or command like ''restore%''' as FindBackupOrRestore
    END
    else if (@log_reuse_wait = 4)
    BEGIN
        select 'Active transactions currently running  for database ''' +@dbname+ '''. To check for active transactions, run these commands:' as Recommendation
        select 'DBCC OPENTRAN (''' +@dbname+ ''')' as FindOpenTran
        select 'select database_id, db_name(database_id) dbname, database_transaction_begin_time, database_transaction_state, database_transaction_log_record_count, database_transaction_log_bytes_used, database_transaction_begin_lsn, stran.session_id from sys.dm_tran_database_transactions dbtran left outer join sys.dm_tran_session_transactions stran on dbtran.transaction_id = stran.transaction_id where database_id = ' + CONVERT(varchar, @database_id) as FindOpenTransAndSession
    END

    else if (@log_reuse_wait = 5)
    BEGIN
        select 'Database Mirroring for database ''' +@dbname+ ''' is behind on synchronization. To check the state of DBM, run the commands below:' as Recommendation
        select 'select db_name(database_id), mirroring_state_desc, mirroring_role_desc, mirroring_safety_level_desc from sys.database_mirroring where mirroring_guid is not null and mirroring_state <> 4 and database_id = ' + convert(sysname, @database_id)  as CheckMirroringStatus
        
        select 'Database Mirroring for database ''' +@dbname+ ''' may be behind: check unsent_log, send_rate, unrestored_log, recovery_rate, average_delay in this output' as Recommendation
        select 'exec msdb.sys.sp_dbmmonitoraddmonitoring 1; exec msdb.sys.sp_dbmmonitorresults ''' + @dbname+ ''', 5, 0; waitfor delay ''00:01:01''; exec msdb.sys.sp_dbmmonitorresults ''' + @dbname+ '''; exec msdb.sys.sp_dbmmonitordropmonitoring'   as CheckMirroringStatusAnd
    END

    else if (@log_reuse_wait = 6)
    BEGIN
        select 'Replication transactions still undelivered from publisher database ''' +@dbname+ ''' to Distribution database. Check the oldest non-distributed replication transaction. Also check if the Log Reader Agent is running and if it has encoutered any errors' as Recommendation
        select 'DBCC OPENTRAN  (''' + @dbname + ''')' as CheckOldestNonDistributedTran
        select 'select top 5 * from distribution..MSlogreader_history where runstatus in (6, 5) or error_id <> 0 and agent_id = find_in_mslogreader_agents_table  order by time desc ' as LogReaderAgentState
    END
    
    else if (@log_reuse_wait = 9)
    BEGIN
        select 'Always On transactions still undelivered from primary database ''' +@dbname+ ''' to Secondary replicas. Check the Health of AG nodes and if there is latency is Log block movement to Secondaries' as Recommendation
        select 'select availability_group=cast(ag.name as varchar(30)), primary_replica=cast(ags.primary_replica as varchar(30)),primary_recovery_health_desc=cast(ags.primary_recovery_health_desc as varchar(30)), synchronization_health_desc=cast(ags.synchronization_health_desc as varchar(30)),ag.failure_condition_level, ag.health_check_timeout, automated_backup_preference_desc=cast(ag.automated_backup_preference_desc as varchar(10))  from sys.availability_groups ag join sys.dm_hadr_availability_group_states ags on ag.group_id=ags.group_id' as CheckAGHealth
        select 'SELECT  group_name=cast(arc.group_name as varchar(30)), replica_server_name=cast(arc.replica_server_name as varchar(30)), node_name=cast(arc.node_name as varchar(30)),role_desc=cast(ars.role_desc as varchar(30)), ar.availability_mode_Desc, operational_state_desc=cast(ars.operational_state_desc as varchar(30)), connected_state_desc=cast(ars.connected_state_desc as varchar(30)), recovery_health_desc=cast(ars.recovery_health_desc as varchar(30)), synchronization_health_desc=cast(ars.synchronization_health_desc as varchar(30)), ars.last_connect_error_number, last_connect_error_description=cast(ars.last_connect_error_description as varchar(30)), ars.last_connect_error_timestamp, primary_role_allow_connections_desc=cast(ar.primary_role_allow_connections_desc as varchar(30)) from sys.dm_hadr_availability_replica_cluster_nodes arc join sys.dm_hadr_availability_replica_cluster_states arcs on arc.replica_server_name=arcs.replica_server_name join sys.dm_hadr_availability_replica_states ars on arcs.replica_id=ars.replica_id join sys.availability_replicas ar on ars.replica_id=ar.replica_id join sys.availability_groups ag on ag.group_id = arcs.group_id and ag.name = arc.group_name ORDER BY cast(arc.group_name as varchar(30)), cast(ars.role_desc as varchar(30))' as CheckReplicaHealth
        select 'select database_name=cast(drcs.database_name as varchar(30)), drs.database_id, drs.group_id, drs.replica_id, drs.is_local,drcs.is_failover_ready,drcs.is_pending_secondary_suspend, drcs.is_database_joined, drs.is_suspended, drs.is_commit_participant, suspend_reason_desc=cast(drs.suspend_reason_desc as varchar(30)), synchronization_state_desc=cast(drs.synchronization_state_desc as varchar(30)), synchronization_health_desc=cast(drs.synchronization_health_desc as varchar(30)), database_state_desc=cast(drs.database_state_desc as varchar(30)), drs.last_sent_lsn, drs.last_sent_time, drs.last_received_lsn, drs.last_received_time, drs.last_hardened_lsn, drs.last_hardened_time,drs.last_redone_lsn, drs.last_redone_time, drs.log_send_queue_size, drs.log_send_rate, drs.redo_queue_size, drs.redo_rate, drs.filestream_send_rate, drs.end_of_log_lsn, drs.last_commit_lsn, drs.last_commit_time, drs.low_water_mark_for_ghosts, drs.recovery_lsn, drs.truncation_lsn, pr.file_id, pr.error_type, pr.page_id, pr.page_status, pr.modification_time from sys.dm_hadr_database_replica_cluster_states drcs join sys.dm_hadr_database_replica_states drs on drcs.replica_id=drs.replica_id and drcs.group_database_id=drs.group_database_id left outer join sys.dm_hadr_auto_page_repair pr on drs.database_id=pr.database_id  order by drs.database_id' as LogMovementHealth
        select 'For more information see https://learn.microsoft.com/troubleshoot/sql/availability-groups/error-9002-transaction-log-large' as OnlineDOCResource
    END    
    else if (@log_reuse_wait in (10, 11, 12, 14))
    BEGIN
        select 'This state is not documented and is expected to be rare and short-lived' as Recommendation
    END    
    else if (@log_reuse_wait = 13)
    BEGIN
        select 'The oldest page on the database might be older than the checkpoint log sequence number (LSN). In this case, the oldest page can delay log truncation.' as Finding
        select 'This state should be short-lived, but if you find it is taking a long time, you can consider disabling Indirect Checkpoint temporarily' as Recommendation
        select 'ALTER DATABASE [' +@dbname+ '] SET TARGET_RECOVERY_TIME = 0 SECONDS' as DisableIndirectCheckpointTemporarily
    END    
    else if (@log_reuse_wait = 16)
    BEGIN
        select 'For memory-optimized tables, an automatic checkpoint is taken when transaction log file becomes bigger than 1.5 GB since the last checkpoint (includes both disk-based and memory-optimized tables)' as Finding
        select 'Review https://blogs.msdn.microsoft.com/sqlcat/2016/05/20/logging-and-checkpoint-process-for-memory-optimized-tables-2/' as ReviewBlog
        select 'use ' +@dbname+ ' CHECKPOINT' as RunCheckpoint
    END    

    FETCH NEXT FROM no_truncate_db into @log_reuse_wait, @log_reuse_wait_desc, @dbname, @database_id, @recovery_model_desc

END

CLOSE no_truncate_db
DEALLOCATE no_truncate_db

SELECT bs.database_name
, backuptype = CASE 
	WHEN bs.type = 'D' and bs.is_copy_only = 0 THEN 'Full Database'
	WHEN bs.type = 'D' and bs.is_copy_only = 1 THEN 'Full Copy-Only Database'
	WHEN bs.type = 'I' THEN 'Differential database backup'
	WHEN bs.type = 'L' THEN 'Transaction Log'
	WHEN bs.type = 'F' THEN 'File or filegroup'
	WHEN bs.type = 'G' THEN 'Differential file'
	WHEN bs.type = 'P' THEN 'Partial'
	WHEN bs.type = 'Q' THEN 'Differential partial' END + ' Backup'
, bs.recovery_model
, BackupStartDate = bs.Backup_Start_Date
, BackupFinishDate = bs.Backup_Finish_Date
, LatestBackupLocation = bf.physical_device_name
, backup_size_mb = bs.backup_size/1024./1024.
, compressed_backup_size_mb = bs.compressed_backup_size/1024./1024.
, database_backup_lsn -- For tlog and differential backups, this is the checkpoint_lsn of the FULL backup it is based on. 
, checkpoint_lsn
, begins_log_chain
FROM msdb.dbo.backupset bs	
LEFT OUTER JOIN msdb.dbo.backupmediafamily bf ON bs.[media_set_id] = bf.[media_set_id]
WHERE recovery_model in ('FULL', 'BULK-LOGGED')
AND bs.backup_start_date > DATEADD(month, -2, sysdatetime()) --only look at last two months
ORDER BY bs.database_name asc, bs.Backup_Start_Date desc;

BACKUP LOG [dbname] TO DISK = 'some_volume:some_folderdbname_LOG.trn'

USE dbname; CHECKPOINT
select * from sys.dm_db_log_info(db_id('dbname'))

DECLARE @log_reached_disk_size BIT = 0

SELECT 
    name LogName, 
    physical_name, 
    CONVERT(bigint, size)*8/1024 LogFile_Size_MB, 
    volume_mount_point, 
    available_bytes/1024/1024 Available_Disk_space_MB,
    (CONVERT(bigint, size)*8.0/1024)/(available_bytes/1024/1024 )*100 file_size_as_percentage_of_disk_space,
    db_name(mf.database_id) DbName
FROM sys.master_files mf CROSS APPLY sys.dm_os_volume_stats (mf.database_id, file_id)
WHERE mf.[type_desc] = 'LOG'
    AND (CONVERT(bigint, size)*8.0/1024)/(available_bytes/1024/1024 )*100 > 90 --log is 90% of disk drive
ORDER BY size DESC

if @@ROWCOUNT > 0
BEGIN

    set @log_reached_disk_size = 1

    -- Discover if any logs have are close to or completely filled disk volume they reside on.
    -- Either Add A New File To A New Drive, Or Shrink Existing File
    -- If Cannot Shrink, Go To Cannot Truncate Section

    DECLARE @db_name_filled_disk sysname, @log_name_filled_disk sysname, @go_beyond_size bigint 
    
    DECLARE log_filled_disk CURSOR FOR
        SELECT 
            db_name(mf.database_id),
            name
        FROM sys.master_files mf CROSS APPLY sys.dm_os_volume_stats (mf.database_id, file_id)
        WHERE mf.[type_desc] = 'LOG'
            AND (convert(bigint, size)*8.0/1024)/(available_bytes/1024/1024 )*100 > 90 --log is 90% of disk drive
        ORDER BY size desc

    OPEN log_filled_disk

    FETCH NEXT FROM log_filled_disk into @db_name_filled_disk , @log_name_filled_disk

    WHILE @@FETCH_STATUS = 0
    BEGIN
        
        SELECT 'Transaction log for database "' + @db_name_filled_disk + '" has nearly or completely filled disk volume it resides on!' AS Finding
        SELECT 'Consider using one of the below commands to shrink the "' + @log_name_filled_disk +'" transaction log file size or add a new file to a NEW volume' AS Recommendation
        SELECT 'DBCC SHRINKFILE(''' + @log_name_filled_disk + ''')' AS Shrinkfile_Command
        SELECT 'ALTER DATABASE ' + @db_name_filled_disk + ' ADD LOG FILE ( NAME = N''' + @log_name_filled_disk + '_new'', FILENAME = N''NEW_VOLUME_AND_FOLDER_LOCATION' + @log_name_filled_disk + '_NEW.LDF'', SIZE = 81920KB , FILEGROWTH = 65536KB )' AS AddNewFile
        SELECT 'If shrink does not reduce the file size, likely it is because it has not been truncated. Please review next section below. See https://learn.microsoft.com/sql/t-sql/database-console-commands/dbcc-shrinkfile-transact-sql' AS TruncateFirst
        SELECT 'Can you free some disk space on this volume? If so, do this to allow for the log to continue growing when needed.' AS FreeDiskSpace




         FETCH NEXT FROM log_filled_disk into @db_name_filled_disk , @log_name_filled_disk

    END

    CLOSE log_filled_disk
    DEALLOCATE log_filled_disk

END

SELECT DB_NAME(database_id) DbName,
       name LogName,
       physical_name,
       type_desc ,
       CONVERT(bigint, SIZE)*8/1024 LogFile_Size_MB ,
       CONVERT(bigint,max_size)*8/1024 LogFile_MaxSize_MB ,
       (SIZE*8.0/1024)/(max_size*8.0/1024)*100 percent_full_of_max_size,
       CASE WHEN growth = 0 THEN 'AUTOGROW_DISABLED' ELSE 'Autogrow_Enabled' END as AutoGrow
FROM sys.master_files
WHERE file_id = 2
    AND (SIZE*8.0/1024)/(max_size*8.0/1024)*100 > 90
    AND max_size not in (-1, 268435456)
    OR growth = 0

if @@ROWCOUNT > 0
BEGIN
    DECLARE @db_name_max_size sysname, @log_name_max_size sysname, @configured_max_log_boundary bigint, @auto_grow int
    
    DECLARE reached_max_size CURSOR FOR
        SELECT db_name(database_id),
               name,
               CONVERT(bigint, SIZE)*8/1024,
               growth
        FROM sys.master_files
        WHERE file_id = 2
            AND ( (SIZE*8.0/1024)/(max_size*8.0/1024)*100 > 90
            AND max_size not in (-1, 268435456)
            OR growth = 0 )


    OPEN reached_max_size

    FETCH NEXT FROM reached_max_size into @db_name_max_size , @log_name_max_size, @configured_max_log_boundary, @auto_grow 

    WHILE @@FETCH_STATUS = 0
    BEGIN
        IF @auto_grow = 0
          BEGIN
            SELECT 'The database "' + @db_name_max_size+'" contains a log file "' + @log_name_max_size + '" whose autogrow has been DISABLED' as Finding
            SELECT 'Consider enabling autogrow or increasing file size via these ALTER DATABASE commands' as Recommendation
            SELECT 'ALTER DATABASE ' + @db_name_max_size + ' MODIFY FILE ( NAME = N''' + @log_name_max_size + ''', FILEGROWTH = 65536KB)' as AutoGrowth
          END
        ELSE
          BEGIN
            SELECT 'The database "' + @db_name_max_size+'" contains a log file "' + @log_name_max_size + '" whose max limit is set to ' + convert(varchar(24), @configured_max_log_boundary) + ' MB and this limit has been reached!' as Finding
            SELECT 'Consider using one of the below ALTER DATABASE commands to either change the log file size or add a new file' as Recommendation
          END
        
        SELECT 'ALTER DATABASE ' + @db_name_max_size + ' MODIFY FILE ( NAME = N''' + @log_name_max_size + ''', MAXSIZE = UNLIMITED)' as UnlimitedSize
        SELECT 'ALTER DATABASE ' + @db_name_max_size + ' MODIFY FILE ( NAME = N''' + @log_name_max_size + ''', MAXSIZE = something_larger_than_' + CONVERT(varchar(24), @configured_max_log_boundary) +'MB )' as IncreasedSize
        SELECT 'ALTER DATABASE ' + @db_name_max_size + ' ADD LOG FILE ( NAME = N''' + @log_name_max_size + '_new'', FILENAME = N''SOME_FOLDER_LOCATION' + @log_name_max_size + '_NEW.LDF'', SIZE = 81920KB , FILEGROWTH = 65536KB )' as AddNewFile

        FETCH NEXT FROM reached_max_size into @db_name_max_size , @log_name_max_size, @configured_max_log_boundary, @auto_grow

    END

    CLOSE reached_max_size
    DEALLOCATE reached_max_size
END
ELSE
    SELECT 'Found no files that have reached max log file size' as Findings

If you are running SQL Server database engine, then you might be experiencing a database error 9002 – The transaction log for database <DBName> is full due to ‘Replication.’ error. The database error 9002 is an error that appears in the database server logs. In this article, I will describe how this error can be resolved.

Recently I faced Error 9002 in shrinking log file in one of the databases where the SQL transaction log file is full and makes database out of space.

Checking log_reuse_wait_desc shows the state of «REPLICATION» before the log can be shrunk or reused.

In my environment, the database doesn’t have any replication enabled. It’s confusing why it’s showing status as waiting on REPLICATION.

To troubleshoot the error, we need to check whether the database is part of REPLICATION (Subscriber, Publisher) or Change Data Capture(CDC) using the following query

Script 1: Check Database status in Replication or CDC

SELECT
Case [is_published]
    When 1 Then 'Database is Publisher in the Replication'
    Else 'Database is not a publisher'
End as PublisherStatus
,
CASE [is_subscribed]
    When 1 Then 'Database is Subscriber in the Replication'
    Else 'Database is not a Subscriber'
End as SubscriberStatus
    ,
Case [is_cdc_enabled]
    When 1 then 'CDC is enabled'
    else 'CDC is not enabled'
End as CDCStatus
FROM sys.databases
WHERE name = 'DBBlogger'

As shown below, my database is not part of Replication (Publisher, Subscriber) or Change Data Capture (CDC).

If the CDC is enabled, further check the status of the CDC capture job (Job name- CDC.<DBName>_Capture) is in a failed state. The CDC job failure causes an issue in log truncation.

Check the job history and troubleshoot it to ensure it’s working fine. Once the job status is successful, you can shrink the database log file to reclaim its space.

Script 2: Shrink Database log file

DECLARE @SQL VARCHAR(MAX);
SET @SQL = '';
SELECT
@SQL = @SQL +
'USE ['+ sd.name +']; CHECKPOINT; DBCC SHRINKFILE ('+f.name+');'
FROM sys.master_files f
INNER JOIN sys.databases sd
 ON sd.database_id = f.database_id
WHERE f.type = 1 /*Shrink log file*/
AND sd.name = 'DatabaseName'
SELECT @SQL SQL
EXEC (@SQL)

Replicate scenario

Let us replicate the scenario to understand it better. I have database ‘dBblogger’ restored from the AdventureWorks sample database from Microsoft.

Note: Adventureworks sample database is available from Microsoft. Reference Link below:

https://docs.microsoft.com/en-us/sql/samples/adventureworks-install-configure?view=sql-server-ver15&tabs=ssms

Run the below command to enable the CDC feature in the database.

Use DBblogger
Go
EXEC sys.sp_cdc_enable_db

Now, check the status of CDC in sys.databases using following script.

Select is_cdc_enabled,log_reuse_wait_desc,name from sys.databases where name=’DBblogger’

Run below statement to enable CDC feature in a particular table. I am using the SalesOrderDetail table in the Sales schema.

Use DBblogger
Go
EXEX sys.sp_cdc_enable_table
@source_schema=N’sales’,
@source_name=N’SalesOrderDetail’,
@role_name= NULL,
@filegroup_name=NULL,
@supports_net_changes=0
GO

It starts the CDC jobs — Capture and Cleanup in SQL agent.

Now for testing purposes, disable and stop the CDC.DBblogger_capture job.

Run some update statement statements in the table

When I check the status in the database, it shows waiting for REPLICATION in the log_reuse_wait_desc column in sys.databases.

Now, if the transaction log is filled with multiple statements, It generates SQL Server error code 9002

Even Alter statement in the database failed due to a 9002 error.

Enable the CDC.DBBlogger_Capture agent job, and make sure it is successful.

The log_resuse_wait_desc column status shows NOTHING, as shown below.

You can shrink the database file using the following DBCC SHRINKFILE statement (Script 2).