SQL Server assert in purecall.cpp:51

BEGIN STACK DUMP:

spid 231

Location: purecall.cpp:51

Expression: !”purecall”

SPID: 200

Process ID: 5125

Description: Pure virtual function call

Server Error: 17065, Severity: 16, State: 1.

Server SQL Server Assertion: File: <purecall.cpp>, line = 51 Failed Assertion = ‘!”purecall”‘ Pure virtual function call. This error may be timing-related. If the error persists after rerunning the statement, use DBCC CHECKDB to check the database for structural integrity, or restart the server to ensure in-memory data structures are not corrupted.

Possible causes for above assert are

1. Antivirus softwares which detours in sqlserver address space can inject their instruction in sqlserver modules and can cause this Ex. Sophos etc..

Run select * from sys.dm_os_loaded_modules and check if there are DLL’d loaded from Antivirus (Company column will have the AV company name). If you see any antivrus exclude SQLServer from them.

(or)

Run lm command in the dump and see if there are any Antivirus DLL’s loaded in sqlserver process memory.

2. If you don’t see any Antivirus dll then run windows memory diagnostic tool and check if there are any memory problems on your system( %windir%\system32\MdSched.exe).

3. If there is no antivirus or memory errors follow the steps in http://mssqlwiki.com/2012/10/16/sql-server-exception_access_violation-and-sql-server-assertion/