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When you execute a parallel query that involves a Merge Join in Microsoft SQL Server 2014, an assertion exception occurs, and you receive the following error message from the SQL Server error log:

<Date> <Time> spid<ID> Using 'dbghelp.dll' version '4.0.5'
<Date> <Time> spid<ID> **Dump thread - spid = <ID>, EC = 0x0000007F8608E160
<Date> <Time> spid<ID> ***Stack Dump being sent to <Disk Name>:\Program Files\Microsoft SQL Server\MSSQL12.MSSQLSERVER\MSSQL\LOG\SQLDump0002.txt
<Date> <Time> spid<ID> * *******************************************************************************
<Date> <Time> spid<ID> *
<Date> <Time> spid<ID> * BEGIN STACK DUMP:
<Date> <Time> spid<ID> * <Date> <Time> spid <ID>
<Date> <Time> spid<ID> *
<Date> <Time> spid<ID> * Location: qxcntxt.cpp:1143
<Date> <Time> spid<ID> * Expression: !"No exceptions should be raised by this code"
<Date> <Time> spid<ID> * SPID: <ID>
<Date> <Time> spid<ID> * Process ID: 3556
<Date> <Time> spid<ID> *
<Date> <Time> spid<ID> * Input Buffer 37 bytes -
<Date> <Time> spid<ID> * 16 00 00 00 12 00 00 00 02 00 00 00 00 00 00 00 00 00
<Date> <Time> spid<ID> * ÿÿ & 01 00 00 00 ff ff 0c 00 00 00 00 00 26 04 04 05 00 00
<Date> <Time> spid<ID> * 00
<Date> <Time> spid<ID> *
<Date> <Time> spid<ID> *
<Date> <Time> spid<ID> Stack Signature for the dump is 0x000000014202549F
<Date> <Time> spid<ID> [INFO] Identity Begin End | State Result Error Speculate Prepared LazyCommit ReadOnly | Transaction Database ThreadId | ReadSet WriteSet ScanSet Savepoint LogSizeRq | CommitDep TotalComm Dependent 0 Dependent 1 Dependent 2 Dependent 3 Dependent 4 Dependent 5 Dependent 6 Dependent 7 | Area Location |
<Date> <Time> spid<ID> Timeout waiting for external dump process 11800.

<Date> <Time> spid<ID> Error: 17066, Severity: 16, State: 1.
<Date> <Time> spid<ID> SQL Server Assertion: File: <qxcntxt.cpp>, line=1143 Failed Assertion = '!"No exceptions should be raised by this code"'. 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.

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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