I see errors Event 53 in the Application log related to SharePoint 2010 Search Server. This occurs when there is a incremental crawl.
Log Name: Application
Source: Microsoft-SharePoint Products-SharePoint Server Search
Date: 4/4/2012 3:07:37 AM
Event ID: 53
Task Category: Search service
Description: Could not create a database session.
Can you offer suggestions on how to resolve this error?