SQL Server: how to query when the last transaction log backup has been taken?
SELECT d.name,
MAX(b.backup_finish_date) AS backup_finish_date
FROM master.sys.sysdatabases d
LEFT OUTER JOIN msdb..backupset b
ON b.database_name = d.name
AND b.type = 'L'
GROUP BY d.name
ORDER BY backup_finish_date DESC
I recommend using this modified script so you can see which database is in FULL or BULK_LOGGED recovery model and not having any LOG BACKUP.
SELECT d.name,
d.recovery_model_desc,
MAX(b.backup_finish_date) AS backup_finish_date
FROM master.sys.databases d
LEFT OUTER JOIN msdb..backupset b
ON b.database_name = d.name
AND b.type = 'L'
GROUP BY d.name, d.recovery_model_desc
ORDER BY backup_finish_date DESC