Search

Database types and descriptions 

http://technet.microsoft.com/en-us/library/cc678868.aspx

Rename the Search service application databases in SharePoint 2013

http://technet.microsoft.com/en-us/library/jj219654.aspx

Move the Search service application databases in SharePoint 2013

http://technet.microsoft.com/en-us/library/jj729803.aspx