SP 2013 - Database Recovery Mode When Using SQL Server Mirroring

Hello Community,
Our DBA is configuring a High Availability Architecture for our SharePoint 2013 Farm. Essentially he is using SQL Server Database mirroring with a clustered automatic failover using a witness server. He has informed me that mirroring requires
that the databases are set to Full Recovery Mode, but that several of the databases are set to Simple Recovery Mode, the databases are the following:
SearchService_DB
SearchService_DB_CrawlStore
SearchService_DB_AnalyticsReportingStore
SearchService_DB_LinksStore
WSS_UsageApplication
User_Profile_DB
User_Sync_DB
User_Social_DB
However, when I checked the following article -
http://technet.microsoft.com/en-us/library/cc678868.aspx - I see that Simple Recovery Mode is the default configuration for these databases. So, finally, here is my question - will it be detrimental to these databases to set them to the Full Recovery
Mode?
Thanks!
Tom
Tom Molskow - Senior SharePoint Architect - Microsoft Community Contributor 2011 and 2012 Award -
Linked-In - SharePoint Gypsy

This really depends on your recovery objectives. The main reason for taking log backups, aside from truncating the log, is to be able to recover to a specific point-in-time. This is very helpful in mission-critical, highly transactional systems. I have not
seen a SharePoint environment require a point-in-time restore of the content or application service database. So for this case, you can overwrite the LDF bakups. Just make sure that you can recover your databases appropriately and meet your recovery objectives
on the farm level.
As far as the log file growth is concerned, you are correct. If you cap the size of your LDF file to let's say 10 GB, regular log backups will truncate the log, thereby, having space for additional transaction log records. The only risk here is when your
log backups are not frequent enough that the LDF file fills up before the next log backup runs to truncate the log. You run the risk of your database behaving as read-only and that will affect the site collections/applications using those databases
Edwin Sarmiento SQL Server MVP | Microsoft Certified Master
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Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs
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