We encountered a problem recently with a two server farm. One server was configured as index and query server. Both servers were delivering pages to users. If a user executed a search on the server which did not run the search services, the Search page returned an error, and we saw the following in the application log and SharePoint logs:
Event Type: Error Event Source: Office Server Search Event Category: Gatherer Event ID: 10032 Description: Could not create a database session. Context: Application '2bee214b-e0b9-413b-8d85-c71002287e99' Details: The database connection string is not available. (0xc0041228)
Application 2bee214b-e0b9-413b-8d85-c71002287e99: The parent farm application root doesn't exist or access denied. - File:d:\office\source\search\search\searchdll\resourcemanagerimpl.cpp Line:703 Application 2bee214b-e0b9-413b-8d85-c71002287e99: Database session creation error for resource type 0. - File:d:\office\source\search\search\searchdll\resourcemanagerimpl.cpp Line:555
After a great deal of investigation and assistance from the guys at Microsoft, we identified the fault. On the server which had no search services configured, we added the following registry keys, copied across from the server which was running index and query functions:
HKLM\SOFTWARE\Microsoft\Office Server\12.0\Search\Applications\<SEARCH APPLICATION GUID>\ResourceManager Data=Server=sqlserver;Database=MOSSWEB_MYSITE_SSP_SEARCH;Trusted_Connection=yes;App=Windows SharePoint Services;Timeout=15 Server=sqlserver;Database=MOSSWEB_MYSITE_SSP_SERVICE;Trusted_Connection=yes;App=Windows SharePoint Services;Timeout=15
Where the Search Application GUID was the GUID from the error message, and the DB connection strings were copied over from the working server.
This resolved the problem, and now both servers deliver search results correctly.
I’m posting this here because I found only two possible leads in all my searching, neither of which detailed the fault. Hopefully, as always, this will help somebody else.