A large percentage of the memory of SQL Server instance is consumed by buffer pool. You can find out the database which consuming more memory using below query.
CASE WHEN database_id = 32767 THEN 'Resource DB' ELSE DB_NAME (database_id) END AS 'DBName',
COUNT (1) AS 'Page Count',
(COUNT (1) * 8)/1024 AS 'Memory Used in MB' ,
CASE WHEN is_modified = 1 THEN 'Dirty Page' ELSE 'Clean Page' END AS 'Page State'
GROUP BY [database_id], [is_modified]
ORDER BY db_name(database_id)
Many clients are using custom stored procedures or third party tools to backup databases in production environments instead of using database maintenance plans. One of the things that you need to do is to maintain the number of backup files that exist on disk, so you don’t run out of disk space. There are several techniques for deleting old files, but in this tip I show how this can be done using PowerShell.
In some cases there may be a need to make a SQL Server table read only. There are several different options for doing this and in this tip we cover various ways that you can make a table read only in a SQL Server database.
DAC: Dedicated Administrator Connection feature is available from the SQL Server 2005. It is available in all the higher editions by default except express edition. DAC will be useful when SQL Server is not responding any connections; in such kind of situation DBA will connect through the DAC and troubleshoot/fix the issue.
You can execute below kind of command for the initial troubleshooting.
-- Locking Info
SELECT * FROM sys.dm_tran_locks
-- Running Sessions
SELECT * FROM sys.dm_exec_sessions
-- Requests Status
SELECT * FROM sys.dm_exec_requests
--To get the SQL Text
DBCC OPENTRAN (SPID)
--To terminate the curlprit process
DAC is disabled by default, it is a good practice to enable the DAC. You can enable the DAC using by executing below query.
--0 = Allow Local Connection,
--1 = Allow Remote Connections*/
sp_configure 'remote admin connections', 1
You can connect using DAC on of the following method.
SQL Server Management Studio
Using Command Prompt: Use SQLCMD utility to connect to SQL Server as below.
-A argument is to specify the DAC connection.
-S argument is to specify the server name.
-d argument is to specify the database name.
-E argument is for windows connection with integrated security true
Using Management Studio: Write ADMIN: before the server name in management studio connection window. It will give you the DAC connection.
To enable the DAC connection in SQL Server express edition add ;-T7806 trace flag as startup parameter.
Go into configuration manager — right click on SQL Server Service and select properties — go into advanced tab and add the trace flag ;-T7806. Once done restart the SQL Server Services.