Questions tagged [dac]
Dedicated Admin Console (DAC) a reserved connection on SQL Server that grants special access to system tables and can help diagnose problems
20
questions
0
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1answer
33 views
Why do I need DAC if I am able to connect to the server via sqlcmd?
DAC attracted my attention at the moment when I was unable to connect to the SQL Server using a traditional way (the reason was deleting logon trigger). I made some searches on the web and it turned ...
1
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0answers
39 views
How many connections does Object Explorer use in SSMS?
I recently enabled DAC and noticed this error when first trying to connect with object explorer in SSMS:
Cannot connect to admin:servername
Dedicated administrator connections are not ...
2
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0answers
25 views
DAC silently swallows tokenization errors in sp_msforeachdb
This morning I hopped on the DAC to check something out. Oops, I made a typo!
1> exec sp_msforeachdb N'
2~ use [?]
3~ select N'?', count(*) from sys.sysrscols;
4~ '
5> go
1>
Can you spot ...
0
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0answers
41 views
SQL Server DAC - Connection Issue
I am having a strange issue when trying to connect to my SQL Server instance remotely from my client computer. I am able to do this on my other instances by opening up a new Database Engine Query and ...
4
votes
1answer
209 views
When using DAC, receiving the “[…] the maximum number of '1' dedicated administrator connections already exists” message in error log
I am about to escalate this to MS, but I thought I would try here first and see if anyone has any ideas as to how to prevent this faux error message...
When connecting to SQL Server (2016 and 2017 ...
3
votes
2answers
298 views
Why SQL Server Service Account connects to the DAC?
We started getting Alerts:
Could not connect because the maximum number of '1' dedicated administrator connections already exists. Before a new connection can be made, the existing dedicated ...
4
votes
1answer
432 views
Static DAC ports for named instances
Using SQL 2016 Enterprise Edition
The default instance will listen on 1433 and the DAC port will listen on TCP 1434. SQL Browser will listen on UDP 1434. Any subsequent named instances will get a ...
3
votes
1answer
1k views
How do we find who used Dedicated Admin Connection
Is there any way to find who used Dedicated Admin Connection?
Not active connection but the previous one which is already closed?
5
votes
2answers
473 views
Enabling admin connection on SQL Server Express to fix logon trigger
Well, luckily I got this error on my test environment. I'm so scared about this error that I disabled all logon triggers I was using on production environment.
I created the famous logon trigger, ...
3
votes
1answer
353 views
How do I know what requires DAC?
Playing around with SQL Server, I came across a semi-cryptic error. Essentially, I only need to log into DAC. Is there any general advice for when DAC is needed? How do I know I need it to access sys....
0
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1answer
6k views
Why am I getting “Invalid object name 'sys.sysobjvalues'.” [duplicate]
When I run
SELECT OBJECT_DEFINITION(OBJECT_ID('sys.assembly_files'));
I can see that there is a self-join on sys.sysobjvalues, but when I try to select that table I get,
Msg 208, Level 16, State 1,...
1
vote
1answer
229 views
SQL Server Error “Database 'mssqlsystemresource' does not exist.”
On Linux, whenever I run use mssqlsystemresource to get access to Resource Database, I get an error. How do I resolve this.
1> use mssqlsystemresource
2> go
Msg 911, Level 16, State 1, Server ...
3
votes
1answer
567 views
How do I log into the Dedicated Admin Console (DAC) on Linux?
sqlcmd is documented to have,
Login-Related Options
-A
Logs in to SQL Server with a Dedicated Administrator Connection (DAC). This kind of connection is used to troubleshoot a server. This ...
1
vote
2answers
458 views
SQL Server Management Studio DAC connection error
I'm trying to connect to SQL Server 2012 via DAC using Management Studio. I type admin: before my server name, yet I keep getting the same error:
A network-related or instance-specific error ...
0
votes
3answers
850 views
No DAC connection could be established on the default port. Make sure DAC is enabled
I could not establish a local DAC connection using SSMS while I was logged into the Sql-Server's Operating System's Remote Desktop. First reason was SQL-Browser Service turned off.
Lateron, second ...
4
votes
1answer
134 views
Is it possible to connect MS SQL Server Express 2012 through DAC Connection?
Is it possible to Connect MS SQL Server 2012 Express Through DAC. After moving from SQL Server 2012 Enterprise to MS SQL Server 2012 Express, some performance problem were there. When i have checked ...
2
votes
2answers
2k views
DAC connection error
I'm having a problem connecting using my dedicated admin connection in SQL Server 2014. I just wanted to test it out.
I have DAC enabled in sp_configure. I have performed RECONFIGURE.
I have ...
2
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0answers
645 views
Severity 20 Error upon disconnecting Dedicated Administrator Connection
Starting working with Dedicated Administrator Connections on SQL Server 2008 R2 servers. All is working fine (once port 1434 was opened), but am getting severity 20 errors when I disconnect the admin ...
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3answers
8k views
Is it possible to estabilish Dedicated Administrator Connection (DAC) using SSMS?
Is it possible to connect to the DAC using SSMS?
If I understand correctly, it should be possible by using "admin:" prefix before the server name, but I receive the following message:
Dedicated ...
2
votes
1answer
9k views
Clients timing out with no apparent reason
I have a SQL Server 2005 server that's been running fine most of the time.
Today the users started to get time outs when opening new connections, including myself when I tried to open another tab on ...
