how do I fix SqlException Time-out occurred while waiting for buffer latch type 2 for page (1:37660679), database ID 10
asp.net, c#, sql-server-2012, sqlexception
Solution
The `FGCB_ADD_REMOVE` latch probably means in your case the a file was expanded due to auto-grow. This causes lots of waiting and IO load.
Or maybe this is just the symptom of a generally IO-overloaded server (either due to load or due to failing disks). Yeah it is probably only a symptom because you are seeing other IO waits timing out, too.
Determine if the server disks are overloaded (for example using perfmon) and improve the situation.
Problem
I was running an application for a few hours and then suddenly: SqlException was unhandled by user code: Time-out occurred while waiting for buffer latch type 2 for page (1:37660679), database ID 10. Viewing details of the exception shows it is a "Number" "845". ErrorCode and HRESULT -2146232060 Question: How do I fix this or debug this problem? I am running ASP.NET C# .NET 4.5 and SQL Server 2012. I ran chkdsk but did not find any errors. There is nothing about an 845 event in the log. Here is some of what I found in the application log(For an event-id 847): Timeout occurred while waiting for latch: class 'FGCB_ADD_REMOVE', id 00000004F146FBD8, type 2, Task 0x00000004F60450C8 : 0, waittime 300 seconds, flags 0x1a, owning task 0x00000004EDC38928. Continuing to wait. There are lots of 847 that look about the same. Then there are much fewer with event-id 846: A time-out occurred while waiting for buffer latch -- type 2, bp 00000004F96EE880, page 1:37660679, stat 0x10b, database id: 10, allocation unit Id: 72057594048544768, task 0x00000004D502E188 : 0, waittime 300 seconds, flags 0x1a, owning task 0x00000004D5316558. Not continuing to wait. Here is an xml view of an 847 event: ``` - <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> - <System> <Provider Name="MSSQLSERVER" /> <EventID Qualifiers="16384">847</EventID> <Level>4</Level> <Task>2</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2013-02-24T19:21:54.000000000Z" /> <EventRecordID>281870</EventRecordID> <Channel>Application</Channel> <Computer>xyz-PC</Computer> <Security UserID="S-1-and-so-on" /> </System> - <EventData> <Data>FGCB_ADD_REMOVE</Data> <Data>00000004F146FBD8</Data> <Data>2</Data> <Data>00000004D5316188</Data> <Data>0</Data> <Data>1200</Data> <Data>1a</Data> <Data>00000004EDC38928</Data> <Binary>4F0300000A00000006000000540053002D005000430000000800000053006300680061006200650072000000</Binary> </EventData> </Event> ``` The error occurred on a line ``` db.SubmitChanges(); ``` In the watch window I can see: ``` db.GetChangeSet() {Inserts: 1, Deletes: 0, Updates: 0} System.Data.Linq.ChangeSet ``` Googling shows up some hotfixes from microsoft but they are only for SQL server 2008.