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Microsoft SQL Server 2008 R2 Transaction log shipping large logs at 2AM

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Hi everyone, i have an odd question.

We've recently migrated to MS SQL 2008 R2 with SP2 and the latest CU, (as in this week)
We use Transaction log shipping to our DR facility for recovery purposes

The issue we are facing is this:
At about 1AM every day so far since we re-introduced the log shipping we have been receiving our WSS_Content database Transaction logs in an out of character large chunk e.g. 19GB over a 50mbps link to our DR SQL server normally the Transaction logs sit at around the 800MB mark sometimes less sometimes more.

I'd like to find out exactly what is happening, additionally I'd like to point out our log shipping time is 15 minutes, during this period the Veeam backup has not been running either so it's not like the logs have built up

I've been able to find out that there is a job called syspolicy_purge_history which is scheduled to run daily @ 2AM however this doesn't fit the picture


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