![]() Start by learning how to use the whistle properly (practice, practice, practice), and then play around with the sounds to figure out which tones will work for which commands. There are two types of whistles to choose from: audible or silent - with "silent" in this case meaning silent for humans, not dogs. ![]() Some whistles are equipped with adjustable pitches, too.Īudible whistles are helpful when you're working out the sounds you want to use and ensure that you're being consistent. SQL Backup Master 6.3 includes a new feature called backup chain validation that is responsible for generating “invalid backup chain detected” messages.This style looks much like a whistle used at sporting events and, in fact, it's used during herding dog events. This article describes the goal and function of this feature. The goal of backup chain validation is to warn users when other third-party applications could potentially interfere with the SQL Server backup chain. Specifically, when a differential or transaction log backup is started, SQL Backup Master analyzes SQL Server’s backup history table and checks to see if the most recent backup was also created by SQL Backup Master. If a possible conflict is detected, SQL Backup Master writes an “invalid backup chain detected” message to the log. Such messages can be logged as warnings (default) or errors, depending on backup job settings. Why is it a potential problem if another software tool is also taking SQL Server backups? Note that copy-only database backups are ignored during backup chain validation, as they don’t interfere with the SQL Server backup chain. If a third-party software tool is taking copy-only SQL Server backups, those will not interfere with the backup chain so SQL Backup Master won’t warn about them. If you need to occasionally take a backup outside of SQL Backup Master (i.e. Via SQL Server Management Studio, etc.) then creating a copy-only backup is a good option.
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