There were inconsistency issue in our database as asked in this question. Same is fixed now and database is running without any issue.
I noticed that SQL service was rebooted many times in last 3 days(as per the errorlog) and this reboot took only 1 to 2 seconds and to my surprise, nobody noticed this whereas this happened in business hour. This is a production database and is used heavily, meaning every second there is 1-3 transaction hitting database.
I noted the time of reboot of service or last few days and noticed that at the same time(every time), one file is created with the name "HkEngineEventFile_0_XXXX" of size 68KB. tried to open that in different tool but, didn't get any info.
Can somebody please help me understanding this and also I need to understand whether it was a real reboot of service or something else.
Below are the entry from SQL errorlog:
2019-07-07 16:51:22.32 Server Microsoft SQL Server 2014 (SP3) (KB4022619) - 12.0.6024.0 (X64)
Sep 7 2018 01:37:51
Copyright (c) Microsoft Corporation
Enterprise Edition: Core-based Licensing (64-bit) on Windows NT 6.3 <X64> (Build 9600: ) (Hypervisor)
2019-07-07 16:51:22.32 Server UTC adjustment: 3:00
2019-07-07 16:51:22.32 Server (c) Microsoft Corporation.
2019-07-07 16:51:22.32 Server All rights reserved.
2019-07-07 16:51:22.32 Server Server process ID is 7916.
2019-07-07 16:51:22.32 Server System Manufacturer: 'VMware, Inc.', System Model: 'VMware Virtual Platform'.
2019-07-07 16:51:22.32 Server Authentication mode is MIXED.
2019-07-07 16:51:22.32 Server Logging SQL Server messages in file 'E:\DB_SQL12.ABC\DB_SQL\Log\ERRORLOG'.
2019-07-07 16:51:22.32 Server The service account is 'Organization_Name\Service_Account'. This is an informational message; no user action is required.
2019-07-07 16:51:22.32 Server Registry startup parameters:
-d E:\DB_SQL12.ABC\DB_SQL\DATA\master.mdf
-e E:\DB_SQL12.ABC\DB_SQL\Log\ERRORLOG
-l E:\DB_SQL12.ABC\DB_SQL\DATA\mastlog.ldf
2019-07-07 16:51:22.32 Server Command Line Startup Parameters:
-s "ABC"
2019-07-07 16:51:22.55 Server SQL Server detected 2 sockets with 4 cores per socket and 4 logical processors per socket, 8 total logical processors; using 8 logical processors based on SQL Server licensing. This is an informational message; no user action is required.
2019-07-07 16:51:22.55 Server SQL Server is starting at normal priority base (=7). This is an informational message only. No user action is required.
2019-07-07 16:51:22.55 Server Detected 24575 MB of RAM. This is an informational message; no user action is required.
2019-07-07 16:51:22.55 Server Using conventional memory in the memory manager.
2019-07-07 16:51:22.72 Server Default collation: SQL_Latin1_General_CP1_CI_AS (us_english 1033)
2019-07-07 16:51:22.77 Server The maximum number of dedicated administrator connections for this instance is '1'
2019-07-07 16:51:22.78 Server This instance of SQL Server last reported using a process ID of 6672 at 7/7/2019 4:50:49 PM (local) 7/7/2019 1:50:49 PM (UTC). This is an informational message only; no user action is required.
2019-07-07 16:51:22.78 Server Node configuration: node 0: CPU mask: 0x00000000000000ff:0 Active CPU mask: 0x00000000000000ff:0. This message provides a description of the NUMA configuration for this computer. This is an informational message only. No user action is required.
2019-07-07 16:51:22.80 Server Using dynamic lock allocation. Initial allocation of 2500 Lock blocks and 5000 Lock Owner blocks per node. This is an informational message only. No user action is required.
2019-07-07 16:51:22.80 Server Database Instant File Initialization: disabled. For security and performance considerations see the topic 'Database Instant File Initialization' in SQL Server Books Online. This is an informational message only. No user action is required.
2019-07-07 16:51:22.83 spid7s Starting up database 'master'.
2019-07-07 16:51:22.88 Server CLR version v4.0.30319 loaded.
2019-07-07 16:51:22.89 spid7s 14 transactions rolled forward in database 'master' (1:0). This is an informational message only. No user action is required.
2019-07-07 16:51:22.90 spid7s 0 transactions rolled back in database 'master' (1:0). This is an informational message only. No user action is required.
2019-07-07 16:51:22.90 spid7s Recovery is writing a checkpoint in database 'master' (1). This is an informational message only. No user action is required.
2019-07-07 16:51:22.96 Server Common language runtime (CLR) functionality initialized using CLR version v4.0.30319 from C:\Windows\Microsoft.NET\Framework64\v4.0.30319\.
2019-07-07 16:51:23.01 spid7s CHECKDB for database 'master' finished without errors on 2019-07-05 21:45:01.463 (local time). This is an informational message only; no user action is required.
2019-07-07 16:51:23.01 spid7s Resource governor reconfiguration succeeded.
2019-07-07 16:51:23.01 spid7s SQL Server Audit is starting the audits. This is an informational message. No user action is required.
2019-07-07 16:51:23.01 spid7s Audit: Server Audit: 65536, Initialized and Assigned State: START_FAILED
2019-07-07 16:51:23.01 spid7s Audit: Server Audit: 65536, Initialized and Assigned State: STARTED
2019-07-07 16:51:23.01 spid7s SQL Server Audit has started the audits. This is an informational message. No user action is required.
2019-07-07 16:51:23.03 spid7s SQL Trace ID 1 was started by login "sa".
2019-07-07 16:51:23.03 spid7s Server name is 'Organization_Name-Service_Account\ABC'. This is an informational message only. No user action is required.
2019-07-07 16:51:23.03 spid7s The NETBIOS name of the local node that is running the server is 'Organization_Name-MWDB01'. This is an informational message only. No user action is required.
2019-07-07 16:51:23.06 spid15s A self-generated certificate was successfully loaded for encryption.
2019-07-07 16:51:23.09 spid15s Server is listening on [ 192.168.100.170 <ipv4> 1433].
2019-07-07 16:51:23.09 spid15s Started listening on virtual network name 'Organization_Name-Service_Account'. No user action is required.
2019-07-07 16:51:23.09 spid15s Server local connection provider is ready to accept connection on [ \\.\pipe\SQLLocal\ABC ].
2019-07-07 16:51:23.09 spid15s Server named pipe provider is ready to accept connection on [ \\.\pipe\$$\Organization_Name-Service_Account\DB_SQL$ABC\sql\query ].
2019-07-07 16:51:23.10 spid15s SQL Server is now ready for client connections. This is an informational message; no user action is required.
2019-07-07 16:51:23.10 Server SQL Server is attempting to register a Service Principal Name (SPN) for the SQL Server service. Kerberos authentication will not be possible until a SPN is registered for the SQL Server service. This is an informational message. No user action is required.
2019-07-07 16:51:23.18 Logon Error: 18456, Severity: 14, State: 38.
2019-07-07 16:51:23.18 Logon Login failed for user 'ABCuser'. Reason: Failed to open the explicitly specified database 'Organization_Name_DB2'. [CLIENT: 192.168.100.151]
2019-07-07 16:51:23.23 Server The SQL Server Network Interface library could not register the Service Principal Name (SPN) [ DB_SQLSvc/Organization_Name-Service_Account.Organization_Name.COM:ABC ] for the SQL Server service. Windows return code: 0x2098, state: 20. Failure to register a SPN might cause integrated authentication to use NTLM instead of Kerberos. This is an informational message. Further action is only required if Kerberos authentication is required by authentication policies and if the SPN has not been manually registered.
2019-07-07 16:51:23.23 Server The SQL Server Network Interface library could not register the Service Principal Name (SPN) [ DB_SQLSvc/Organization_Name-Service_Account.Organization_Name.COM:1433 ] for the SQL Server service. Windows return code: 0x2098, state: 20. Failure to register a SPN might cause integrated authentication to use NTLM instead of Kerberos. This is an informational message. Further action is only required if Kerberos authentication is required by authentication policies and if the SPN has not been manually registered.
2019-07-07 16:51:23.40 Logon Error: 18456, Severity: 14, State: 38.
2019-07-07 16:51:23.40 Logon Login failed for user 'DB2user'. Reason: Failed to open the explicitly specified database 'Organization_Name_DB2'. [CLIENT: 192.168.100.151]
2019-07-07 16:51:23.45 spid16s A new instance of the full-text filter daemon host process has been successfully started.
2019-07-07 16:51:23.49 spid19s Starting up database 'msdb'.
2019-07-07 16:51:23.49 spid20s Starting up database 'Organization_Name_DB1'.
2019-07-07 16:51:23.49 spid22s Starting up database 'Organization_Name_DB2'.
2019-07-07 16:51:23.50 spid21s Starting up database 'Organization_Name_ABC'.
2019-07-07 16:51:23.50 spid23s Starting up database 'DB3'.
2019-07-07 16:51:23.50 spid24s Starting up database 'DBA_Maintenance'.
2019-07-07 16:51:23.50 spid10s Starting up database 'DB_SQLsystemresource'.
2019-07-07 16:51:23.50 spid25s Starting up database 'DB4'.
2019-07-07 16:51:23.53 spid10s The resource database build version is 12.00.6024. This is an informational message only. No user action is required.
2019-07-07 16:51:23.60 spid25s 2 transactions rolled forward in database 'DB4' (10:0). This is an informational message only. No user action is required.
2019-07-07 16:51:23.72 spid7s 0 transactions rolled back in database 'DB4' (10:0). This is an informational message only. No user action is required.
2019-07-07 16:51:23.72 spid10s Starting up database 'model'.
2019-07-07 16:51:23.75 spid24s 47 transactions rolled forward in database 'DBA_Maintenance' (9:0). This is an informational message only. No user action is required.
2019-07-07 16:51:23.81 spid20s 1001 transactions rolled forward in database 'Organization_Name_DB1' (5:0). This is an informational message only. No user action is required.
2019-07-07 16:51:23.93 spid7s 0 transactions rolled back in database 'DBA_Maintenance' (9:0). This is an informational message only. No user action is required.
2019-07-07 16:51:23.93 spid7s Recovery is writing a checkpoint in database 'DBA_Maintenance' (9). This is an informational message only. No user action is required.
2019-07-07 16:51:23.97 spid19s 1934 transactions rolled forward in database 'msdb' (4:0). This is an informational message only. No user action is required.
2019-07-07 16:51:24.06 Server Software Usage Metrics is disabled.
2019-07-07 16:51:24.08 spid10s CHECKDB for database 'model' finished without errors on 2019-07-05 21:45:02.243 (local time). This is an informational message only; no user action is required.
2019-07-07 16:51:24.08 spid10s Clearing tempdb database.
2019-07-07 16:51:24.14 spid7s 0 transactions rolled back in database 'Organization_Name_DB1' (5:0). This is an informational message only. No user action is required.
2019-07-07 16:51:24.14 spid7s Recovery is writing a checkpoint in database 'Organization_Name_DB1' (5). This is an informational message only. No user action is required.
2019-07-07 16:51:24.24 spid10s Starting up database 'tempdb'.
2019-07-07 16:51:24.25 spid7s 0 transactions rolled back in database 'msdb' (4:0). This is an informational message only. No user action is required.
2019-07-07 16:51:24.25 spid7s Recovery is writing a checkpoint in database 'msdb' (4). This is an informational message only. No user action is required.
2019-07-07 16:51:24.36 spid10s The tempdb database has 1 data file(s).
2019-07-07 16:51:24.36 spid30s The Service Broker endpoint is in disabled or stopped state.
2019-07-07 16:51:24.36 spid30s The Database Mirroring endpoint is in disabled or stopped state.
2019-07-07 16:51:24.36 spid19s CHECKDB for database 'msdb' finished without errors on 2019-07-05 21:45:02.820 (local time). This is an informational message only; no user action is required.
2019-07-07 16:51:24.37 spid30s Service Broker manager has started.
2019-07-07 16:51:24.40 spid25s CHECKDB for database 'DB4' finished without errors on 2019-07-03 23:30:07.940 (local time). This is an informational message only; no user action is required.
2019-07-07 16:51:24.40 spid24s CHECKDB for database 'DBA_Maintenance' finished without errors on 2019-07-04 07:58:21.313 (local time). This is an informational message only; no user action is required.
2019-07-07 16:51:24.43 spid20s CHECKDB for database 'Organization_Name_DB1' finished without errors on 2019-07-03 23:30:44.193 (local time). This is an informational message only; no user action is required.
2019-07-07 16:51:24.55 spid52 Configuration option 'show advanced options' changed from 0 to 1. Run the RECONFIGURE statement to install.
2019-07-07 16:51:24.55 spid52 Configuration option 'Agent XPs' changed from 0 to 1. Run the RECONFIGURE statement to install.
2019-07-07 16:51:24.56 spid52 Configuration option 'show advanced options' changed from 1 to 0. Run the RECONFIGURE statement to install.
2019-07-07 16:51:24.81 spid23s 1391 transactions rolled forward in database 'DB3' (8:0). This is an informational message only. No user action is required.
2019-07-07 16:51:24.82 spid52 Attempting to load library 'xpsqlbot.dll' into memory. This is an informational message only. No user action is required.
2019-07-07 16:51:24.82 spid52 Using 'xpsqlbot.dll' version '2014.120.6024' to execute extended stored procedure 'xp_qv'. This is an informational message only; no user action is required.
2019-07-07 16:51:24.90 spid52 Attempting to load library 'xpstar.dll' into memory. This is an informational message only. No user action is required.
2019-07-07 16:51:24.91 spid52 Using 'xpstar.dll' version '2014.120.6024' to execute extended stored procedure 'xp_sqlagent_notify'. This is an informational message only; no user action is required.
2019-07-07 16:51:24.92 spid7s 0 transactions rolled back in database 'DB3' (8:0). This is an informational message only. No user action is required.
2019-07-07 16:51:24.92 spid7s Recovery is writing a checkpoint in database 'DB3' (8). This is an informational message only. No user action is required.
2019-07-07 16:51:24.94 spid23s CHECKDB for database 'DB3' finished without errors on 2019-07-03 23:41:10.877 (local time). This is an informational message only; no user action is required.
2019-07-07 16:51:25.04 spid22s Recovery of database 'Organization_Name_DB2' (6) is 0% complete (approximately 313 seconds remain). Phase 1 of 3. This is an informational message only. No user action is required.
2019-07-07 16:51:25.05 spid22s Recovery of database 'Organization_Name_DB2' (6) is 0% complete (approximately 310 seconds remain). Phase 1 of 3. This is an informational message only. No user action is required.
2019-07-07 16:51:25.29 spid22s 5868 transactions rolled forward in database 'Organization_Name_DB2' (6:0). This is an informational message only. No user action is required.
2019-07-07 16:51:25.42 spid21s 82 transactions rolled forward in database 'Organization_Name_ABC' (7:0). This is an informational message only. No user action is required.
2019-07-07 16:51:25.49 spid7s 0 transactions rolled back in database 'Organization_Name_DB2' (6:0). This is an informational message only. No user action is required.
2019-07-07 16:51:25.49 spid7s Recovery is writing a checkpoint in database 'Organization_Name_DB2' (6). This is an informational message only. No user action is required.
2019-07-07 16:51:25.51 spid22s CHECKDB for database 'Organization_Name_DB2' finished without errors on 2019-07-03 23:30:45.717 (local time). This is an informational message only; no user action is required.
2019-07-07 16:51:25.62 spid7s 0 transactions rolled back in database 'Organization_Name_ABC' (7:0). This is an informational message only. No user action is required.
2019-07-07 16:51:25.62 spid7s Recovery is writing a checkpoint in database 'Organization_Name_ABC' (7). This is an informational message only. No user action is required.
2019-07-07 16:51:25.64 spid21s CHECKDB for database 'Organization_Name_ABC' finished without errors on 2019-07-03 03:31:59.657 (local time). This is an informational message only; no user action is required.
2019-07-07 16:51:25.64 spid7s Error: 8355, Severity: 16, State: 1.
2019-07-07 16:51:25.64 spid7s Server-level event notifications can not be delivered. Either Service Broker is disabled in msdb, or msdb failed to start. Event notifications in other databases could be affected as well. Bring msdb online, or enable Service Broker.
2019-07-07 16:51:25.64 spid7s Recovery is complete. This is an informational message only. No user action is required.
2019-07-07 16:54:38.88 spid57 ex_dump_if_requested: Exception raised, major=52, minor=42, state=9, severity=22, attempting to create symptom dump
2019-07-07 16:54:38.88 spid57 Using 'dbghelp.dll' version '4.0.5'
2019-07-07 16:54:38.89 spid57 **Dump thread - spid = 0, EC = 0x00000004D7695F10
Version: Microsoft SQL Server 2014 (SP3) (KB4022619) – 12.0.6024.0
(X64) Sep 7 2018 01:37:51 Copyright (c) Microsoft Corporation
Enterprise Edition: Core-based Licensing (64-bit) on Windows NT 6.3
(Build 9600: ) (Hypervisor)
Best Answer
That's the output of an "internal" Extended Events (XE) session that provides troubleshooting information for In-Memory OLTP (Hekaton) tables. Although it doesn't show up in the SSMS GUI, you can see where it's defined in the DMVs:
Which displays these results:
As you can see, it can have up to 20 files at a time before they start to get overwritten.
68 KB is just the minimum amount of data written to that file (the basic outer XML structure), so you must not be using Hekaton.
New files will get created for the normal reasons (service restart, server restart, event session stop / start, etc). There might be other reasons that internal sessions rollover, but I am not aware of any.
Note that the SQL Server log output you showed does indicate that SQL Server was restarted, and is starting up - and the timing lines up with one of the .xel files in your screenshot (7/7 at 4:51 PM).
Finally, you may want to look into those last few lines of the log, and possibly open a case with Microsoft, as it looks like SQL Server may be producing crash dump files: