Delete Only Log Backup History in SQL Server Is it possible to run something like dbo.sp_delete_backuphistory to only delete transaction log backups without rolling your own scripts? Using Ola's maintenance scripts, we do 5 minute log backups on all our critical databases and nightly differential and weekly full backups. This means we get about 8500 transaction log backups in a month, but only 30ish differentials and 4-5 full backups.

We keep the full and differentials for much longer than we do log backups, so we'd like to keep the backup history for those, but we'd like to reduce the size of our backup tables (particularly backupset) as it's slowing down our monitoring tool.
There isn't any builtin code to just delete the transaction log backup history. You'd have to roll your own to achieve that. 

But I would recommend that you just dump the data that you want to keep in a separate table and purge msdb backup history normally with sp_delete_backuphistory.