Avamar SQL Plugin Useful TSQL scripts and when to use them during troubleshooting

• Get Entire Database Backup History including its size backed up over a certain date range.

SELECT msdb.dbo.backupset.database_name,
msdb.dbo.backupset.backup_start_date,
msdb.dbo.backupset.backup_size,
msdb.dbo.backupset.backup_finish_date,
msdb.dbo.backupset.type,
msdb.dbo.backupset.database_backup_lsn,
msdb.dbo.backupset.first_lsn,
msdb.dbo.backupset.last_lsn
FROM msdb.dbo.backupmediafamily
INNER JOIN msdb.dbo.backupset
ON msdb.dbo.backupmediafamily.media_set_id = msdb.dbo.backupset.media_set_id 
WHERE database_name IN ('sql_database_name_here')
--and msdb.dbo.backupset.backup_finish_date between '1/20/2000' and '10/14/2022'
ORDER BY 
2 DESC,
3 DESC

This TSQL script is used to check the SQL LSN number sequence and whether the "log chain" is broken when avsql logs show "Log gap" errors.

• The Backup LSN Information can be validated by running the following two queries.

SELECT last_lsn, type, user_name FROM msdb..backupset WHERE database_name=N'sql_database_name_here' AND type LIKE 'L' ORDER by last_lsn DESC

SELECT last_log_backup_lsn FROM sys.database_recovery_status "WHERE database_id = DB_ID(N’sql_database_name_here')"

Note: Customize the "sql_database_name_here" entries to your need.