Product:

Microsoft SQL server 2016

Issue:

Is there someone inside the database?

Suggested Solution:

Run this SQL script to see who have logged in to the database:

select 

@@servername as [ServerName],

getdate() as RunTime, 

spid, DB_NAME(dbid) as DatabaseName, 

login_time, 

last_batch, 

hostname, 

program_name, 

nt_domain, 

nt_username, 

loginame 

From master..sysprocesses

 

To get more information, like kerberos, run this SQL script:

select c.auth_scheme,* from sys.dm_exec_sessions s join sys.dm_exec_connections c on s.session_id=c.session_id where s.host_name ='servername'

To see active connections:

EXEC sp_who2 'active';

More Information:

https://www.sqlservercentral.com/articles/is-this-database-being-used

Product:

Microsoft SQL server 2016

Issue:

Error when testing linked servers in SQL server.

Solution:

Ensure the port is open first, by start PowerShell on the from server and use Test-NetworkConnection.  Enter below to check port 1433;

tnc servername -port 1433

If firewall is open, and you get a error saying “anonymous login” then the kerberos delegation does not work. You need to check that your account (or the account that run the SQL agent service) is allowed to be delegated, check with this power-shell command;

Get-ADUser -Filter {SamAccountName -eq "YourAccountSamName"} -Properties msDS-AllowedToDelegateTo | Select-Object -ExpandProperty msDS-AllowedToDelegateTo

You must check that the SQL server machine, have in AD allow to delegate, you do this with this PowerShell command (for both servers);

Get-ADComputer ComputerName -Properties * | Format-List -Property *delegat*,msDS-AllowedToActOnBehalfOfOtherIdentity

TrustedForDelegation must be True.

Ask the Active Directory team to correct above.

More information:

Microsoft Made an Easy Button for SPN and Double Hop Issues

Double-Hop Linked Servers

https://help.zaptechnology.com/zap%20cubexpress/currentversion/content/topics/HowTo/UsingSPN.htm

https://social.technet.microsoft.com/wiki/contents/articles/717.service-principal-names-spn-setspn-syntax.aspx

https://kb.parallels.com/en/124644

https://www.sqlshack.com/how-to-create-and-configure-a-linked-server-in-sql-server-management-studio/

https://www.mssqltips.com/sqlservertip/6083/understanding-sql-server-linked-servers/

https://www.c-sharpcorner.com/UploadFile/suthish_nair/linked-servers-in-sql-server-2008/

https://en.hackndo.com/constrained-unconstrained-delegation/

https://www.microsoft.com/en-us/download/details.aspx?id=39046&WT.mc_id=soc-n-%5bTR%5d-loc-%5bServices%5d-%5bfarukc%5d

Product:

Microsoft SQL server 2016

Issue:

SQL agent can not send mail. There is no error in windows event log, and no errors in SQL server log.

Solution:
Install NET Framework 3.5 on your SQL server.  Download from here:

https://www.microsoft.com/en-us/download/details.aspx?id=25150

SQL server 2016 demands Net Framework 3.5 for the mail function to work.

Check if NET Framework is installed on your server in folder:

C:\Windows\Microsoft.NET\Framework64

Folder is missing from the SQL server where SQL Mail is not working.

On a SQL server, where mail function is okay, the v3.5 folder exist.

You can also test this by go to the SQL server, start a command prompt, and go to folder

C:\Program Files\Microsoft SQL Server\MSSQL13.MSSQLSERVER\MSSQL\Binn

Run DataBaseMail.exe

If you get a error that Net Framework can not be installed, then this is the problem.

Please note that the windows account that run the SQL Server Agent (MSSQLSERVER) must have access rights to the Net Framework 3.5 folder and its files.

You can check if SMTP mail host is working by run below PowerShell command:

Send-MailMessage -To "your.mail@company.com" -From "noreply@company.com"  -Subject "Test mail powershell" -Body "Some important plain text!" -Credential (Get-Credential) -SmtpServer "smtp-servername" -Port 25

If that works, then the SMTP and firewall is correct. Then you need to check SQL servers settings;

SELECT [sysmail_server].[account_id],

       [sysmail_account].[name] AS [Account Name],

       [servertype],

       [servername] AS [SMTP Server Address],

       [Port]

FROM [msdb].[dbo].[sysmail_server]

     INNER JOIN [msdb].[dbo].[sysmail_account] ON [sysmail_server].[account_id] = [sysmail_account].[account_id];

Above gives you the SMTP setup

EXEC msdb.dbo.sysmail_help_queue_sp @queue_type = 'Mail';
Above will show the status of the mail log
SELECT TOP (1000) [profile_id]
,[name]
,[description]
,[last_mod_datetime]
,[last_mod_user]
FROM [msdb].[dbo].[sysmail_profile]

Above will show the SQL Mail profiles.

More information:

Troubleshooting Database Mail Failures

https://www.sqlshack.com/configure-database-mail-sql-server/

Check version of SQL server : https://sqlserverbuilds.blogspot.com/

Product:

Microsoft SQL server

Issue:
SQL server is slow, is it low on memory?

Solution:

Get Brent Ozar Health check.  https://www.brentozar.com/blitz/ 

Other solution:

Check if SQL server need to move pages out of memory with this code:

SELECT *

FROM sys.dm_os_performance_counters

WHERE [counter_name] = 'Page life expectancy'

Page Life Expectancy drops can be triggered by confusing operations. By default, any one running query can get a memory grant the size of 25% of your buffer pool. Run a few of those queries at the same time, and your buffer pool gets drained – but PLE doesn’t necessarily drop. However, the instant an unrelated query runs and needs to get data that isn’t cached in RAM, your PLE will drop catastrophically. Which queries are at fault? ”

Check how memory is used by each database:

SELECT

    (CASE WHEN ([database_id] = 32767)

        THEN N'Resource Database'

        ELSE DB_NAME ([database_id]) END) AS [DatabaseName],

    COUNT (*) * 8 / 1024 AS [MBUsed],

    SUM (CAST ([free_space_in_bytes] AS BIGINT)) / (1024 * 1024) AS [MBEmpty]

FROM sys.dm_os_buffer_descriptors

GROUP BY [database_id];

GO

 

 

More Information:

https://www.brentozar.com/archive/2020/06/page-life-expectancy-doesnt-mean-jack-and-you-should-stop-looking-at-it/

https://houseofbrick.com/page-life-expectancy-and-what-its-telling-you/

https://www.spotlightcloud.io/blog/monitoring-page-life-expectancy-in-sql-server

https://training.brentozar.com/p/how-i-use-the-first-responder-kit

SQL SERVER – What is Page Life Expectancy (PLE) Counter

https://www.sqlskills.com/blogs/paul/performance-issues-from-wasted-buffer-pool-memory/

https://github.com/SQLadmin/AwesomeSQLServer/blob/master/T-SQL%20Scripts/Memory%20Monitoring.sql

Product:

Microsoft SQL server

Issue:
How slow is the disk for my databases?

Suggested solution:

This query will show Average Total Latency for each database, value above 10ms is bad.

SELECT DB_NAME(vfs.database_id) AS database_name ,physical_name AS [Physical Name],

size_on_disk_bytes / 1024 / 1024. AS [Size of Disk] ,

CAST(io_stall_read_ms/(1.0 + num_of_reads) AS NUMERIC(10,1)) AS [Average Read latency] ,

CAST(io_stall_write_ms/(1.0 + num_of_writes) AS NUMERIC(10,1)) AS [Average Write latency] ,

CAST((io_stall_read_ms + io_stall_write_ms)

/(1.0 + num_of_reads + num_of_writes)

AS NUMERIC(10,1)) AS [Average Total Latency],

num_of_bytes_read / NULLIF(num_of_reads, 0) AS [Average Bytes Per Read],

num_of_bytes_written / NULLIF(num_of_writes, 0) AS [Average Bytes Per Write]

FROM sys.dm_io_virtual_file_stats(NULL, NULL) AS vfs

JOIN sys.master_files AS mf

ON vfs.database_id = mf.database_id AND vfs.file_id = mf.file_id

ORDER BY [Average Total Latency] DESC

 

More information:

https://www.sqlshack.com/sql-server-troubleshooting-disk-i-o-problems/

https://www.mssqltips.com/sqlservertip/6125/disk-latency-for-sql-server-database-and-transaction-log-files/

https://www.brentozar.com/blitz/slow-storage-reads-writes/

Product:

Microsoft SQL server

Issue:

Can i list when all databases where backed up?

Solution:

Enter a Query;

SELECT

    bs.database_name,

bs.backup_size,

    bs.backup_start_date,

    bs.backup_finish_date,

    bs.server_name, 

    bs.user_name,

    bs.type,

    bm.physical_device_name

FROM msdb.dbo.backupset AS bs

INNER JOIN msdb.dbo.backupmediafamily AS bm on bs.media_set_id = bm.media_set_id

More information:

https://www.mssqltips.com/sqlservertip/3171/identify-sql-server-databases-that-are-no-longer-in-use/

https://www.mssqltips.com/sqlservertip/1601/script-to-retrieve-sql-server-database-backup-history-and-no-backups/

Getting database backup history in SQL Server

How to automate SQL Server database backups

https://ola.hallengren.com/sql-server-backup.html

Product:
Microsoft SQL Server

Issue:

How list users in a database?

Suggestion:

To get all users in one database;

use [database_name]
select name as username,
       create_date,
       modify_date,
       type_desc as type,
       authentication_type_desc as authentication_type
from sys.database_principals
where type not in ('A', 'G', 'R', 'X')
      and sid is not null
      and name != 'guest'
order by username;

To get all users on the SQL server;

declare @db varchar(100)
declare @user varchar(100)
declare c cursor for select name from sys.sysdatabases        

open c

fetch next from c into @db

while @@fetch_status = 0
begin
    print @db   
    exec ('use ' + @db)

    declare u cursor for select name from sys.sysusers
        where issqlrole <> 1 and hasdbaccess <> 0 and isntname <> 1

    open u   

    fetch next from u into @user

    while @@fetch_status = 0
    begin
        print @user
        fetch next from u into @user
    end

    print '--------------------------------------------------'
    close u     
    deallocate u    
    fetch next from c into @db
end

close c
deallocate c

 

To list the DB_OWNERS in database, use this code:

SELECT user_name(member_principal_id)

FROM   sys.database_role_members

WHERE  user_name(role_principal_id) = 'db_owner'

To get more information, you can query like this:

SELECT  members.name MemberName, roles.name,roles.type_desc,members.type_desc

FROM sys.database_role_members rolemem

INNER JOIN sys.database_principals roles

    ON rolemem.role_principal_id = roles.principal_id

INNER JOIN sys.database_principals members

    ON rolemem.member_principal_id = members.principal_id

where 

 roles.name like  'db_owner'

To find out who is sysadmin on the SQL database:

SELECT createdate,accdate, name FROM sys.syslogins WHERE sysadmin = 1

 

 

More Information:

https://stackoverflow.com/questions/2445444/how-to-get-a-list-of-users-for-all-instances-databases

https://dev.to/jsgurugit/list-users-in-sql-server-database-1k20

https://docs.microsoft.com/en-us/sql/relational-databases/system-catalog-views/sys-database-role-members-transact-sql?view=sql-server-ver15

https://www.sqlserver-dba.com/2015/05/find-database-users-mapped-to-db_owner-role.html

List of Users with db_owner Role in All Databases

https://www.mssqltips.com/sqlservertip/6828/sql-server-login-user-permissions-fn-my-permissions/

Product:
Microsoft SQL server

Issue:
How to simple move database file to other hard disk?

Suggested solution:

There are many ways to do this task, this is one of them:

Detach the database with a SQL query:

Use MASTER
GO

-- Set database to single user mode
ALTER DATABASE adventure
SET SINGLE_USER
GO 

-- Detach the database
sp_detach_db 'Adventure'
GO

 

Copy the files with robocopy from a command prompt:

Syntax are : ROBOCOPY source destination [file [file]…] [options]

The /MOV parameter will move the file, if you leave it out – there will be a copy instead.

This will move file adventure.mdf from C to D drive.

robocopy /MOV "C:\Program Files\Microsoft SQL Server\MSSQL13.MSSQLSERVER\MSSQL\DATA"  D:\Data   adventure.mdf

This will move file adventure.ldf from C to L drive.

robocopy /MOV "C:\Program Files\Microsoft SQL Server\MSSQL13.MSSQLSERVER\MSSQL\DATA"  L:\Log   adventure.ldf

You need to put file path in ” if they contain spaces.

Attach the database with a SQL query:

USE master
GO

-- Attach the database
sp_attach_DB 'Adventure', 
'D:\data\Adventure.mdf',
'L:\log\Adventure.ldf'
GO

 

More Information:

Robocopy does NOT like trailing \

The Ultimate Guide to Robocopy

https://dba.stackexchange.com/questions/52007/how-do-i-move-sql-server-database-files

https://docs.microsoft.com/en-us/sql/relational-databases/databases/move-user-databases?view=sql-server-2017

https://www.mssqltips.com/sqlservertip/1774/move-sql-server-transaction-log-files-to-a-different-location-via-tsql-and-ssms/

How to Move Log File or MDF File in SQL Server? – Interview Question of the Week #208

 

Product:
Cognos Analytics 11.1.7
Microsoft Windows 2019 server

Issue:

I have installed all of cognos on the windows server, but only want it to act as Content Manager, in a multi server setup. What service should be running?

Solution:

Go into Cognos Configuration on your CM server.

Set all to False, except this services:

Content Manager service enabled?
Event management service enabled?
Job service enabled?
Metadata service enabled?
Monitor service enabled?

Save the configuration and restart all your CA11 servers.

More information:

https://www.ibm.com/docs/en/cognos-analytics/11.2.0?topic=architecture-cognos-analytics-services

Schedule jobs in CA11 is handled by the Monitor service.

Product:
Cognos Controller 10.4.2
Cognos Analytics 11.1.7
Microsoft Windows 2016 server

Issue:
After a windows patch, no one can login to cognos controller.

Error:

An error occurred while trying to access server…

System.Web.Services.Protocols.SoapException: Server was unable to process request. —> System.IndexOutOfRangeException: Index was outside the bounds of the array….

Solution:

Login to Windows server where CA11 and Cognos Controller IIS are.

Launch a command prompt
Type the following:    IISRESET

 

Check if you can login to Cognos Controller, after above restart of www service.

More information:

https://www.ibm.com/docs/en/cognos-controller/10.4.2?topic=controller-error-occurred-while-trying-access-server