You should expect to see entries that look similar to the example below in the log file which is generated. So what does the output of the Job look like? Don’t forget to disable the Job whenever you are finished testing. Note that after completing the setup the Job will start immediately and will append its output to the specified log file every 10 seconds (you can adjust this to your desired frequency). Lastly, back on the ‘New Job’ dialog, click ‘OK’ again to complete the Job setup. This will help to minimise the size of the log files. If desired, you can also configure the ‘Starting at’ and ‘Ending at’ fields to match the period during which the database is active. Under the ‘Daily frequency’ heading, change the ‘Occurs every’ value to ’10’ and set the interval combo-box to ‘second(s)’. Under the ‘Frequency’ heading, set ‘Occurs’ to ‘Daily’. Leave the ‘Schedule type’ as ‘Recurring’. Configuring the Job Schedule settingsĮnter a name into the ‘Name’ field e.g. ‘Run as user’ can be left empty etc.īack on the ‘New Job’ dialog go to the ‘Schedules’ section and click on the ‘New…’ button. Configuring the Advanced settings of the ‘Run SQL’ Job StepĬhoose an ‘Output file’ location and select the ‘Append output to existing file’ option.Įverything else can be left as default e.g. Moving on, within the same ‘New Job Step’ dialog, go to the ‘Advanced’ tab. When we’ve completed the setup, our Job will capture the output of the PRINT command and log it to a file. The details of each blocked process are then selected and printed. The SQL creates a temporary table and inserts the details of all SQL Server processes which are currently blocked into it. WHILE ( > 0 ) BEGIN PRINT 'DBCC Results for SPID ' + CAST AS VARCHAR ( 5 )) + ' (' + RTRIM ) + ')' PRINT '-' PRINT '' DBCC INPUTBUFFER ) PRINT '' SELECT TOP = BlockedSPID = BlockedStatus sysprocesses WHERE blocked 0 INT CHAR ( 10 ) SELECT TOP = BlockedSPID = BlockedStatus sysprocesses WHERE blocked 0 UNION SELECT DISTINCT blocked, 'BLOCKING' FROM master. SELECT DISTINCT spid, 'BLOCKED' FROM master. sysobjects WHERE name = '#BlockedProcesses' ) DROP TABLE #BlockedProcessesīlockedStatus CHAR ( 10 ) ) GO INSERT INTO #BlockedProcesses SET NOCOUNT ON GO IF EXISTS ( SELECT name FROM tempdb. Paste the following SQL into the ‘Command’ textbox. The ‘Database’ should default to ‘master’. Set the ‘Type’ to be ‘Transact-SQL script (T-SQL)’. Configuring the General settings of the ‘Run SQL’ Job StepĮnter a name into the ‘Step name’ field e.g. Next, go to the ‘Steps’ section on the left-hand side and click the ‘New…’ button.Ī ‘New Job Step’ dialog will open up. You can leave everything else at the default values unless there’s something in particular that you want to change. Configuring the General settings of the JobĮnter a sensible name into the ‘Name’ field e.g. The ‘General’ section of the dialog allows you to configure some basic settings for the Job. However, the steps should be very similar for earlier versions.Īfter you have logged into your database instance, right-click on the ‘SQL Server Agent’ node, select ‘New’, then select ‘Job…’. Note that I’m using version 18 of SQL Server Management Studio and I’m connecting to a SQL Server 2019 instance. You’ll also need to have SQL Server Management Studio installed.įirst of all, open up SQL Server Management Studio and connect to the database instance which you need to configure the logging for. Setting things upīefore we begin, you’ll need an Edition of SQL Server which includes the SQL Server Agent, such as the Standard or Developer Edition. The monitoring which we’ll configure below will help you to track down this kind of issue and will also allow you to see generally where there is contention/locking occurring in your database. One of the queries will succeed and the other query will fail with a deadlock error. In very simple terms, a deadlock will occur if query ‘A’ is waiting for a particular resource that query ‘B’ is using, while at the same time query ‘B’ is waiting for a resource that query ‘A’ is currently holding on to. This is the kind of error message you might expect to see when your application encounters a deadlock. Transaction (Process ID 74) was deadlocked on lock resources with another process and has been chosen as the deadlock victim. So how do we recognise when our application has encountered a deadlock? The logs which are produced will show the exact SQL queries which were running at the time of each deadlock, providing you with the information you need in order to determine the root cause. In this article, I demonstrate a simple way to set up lock monitoring for your database. What you need under these circumstances is an automated way of tracking the locks and logging them. Quite often there are situations in which you are aware that deadlocks are happening in your SQL Server database, but you are lacking the information required to fix them.
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