This post can help a SQL DBA / Developer to quickly find the SQL Server Blocking Report using T-SQL scripts. There are various ways to get the SQL Server Blocking Report but here we are going to discuss only on T-SQL scripts which can be handy for any DBA or Developer to quickly get the details. Usually we need not worry about the process blocking when it occurs occasionally for a short time periods but we can consider it’s as a critical problem when the same issue repeating multiple times or blocking exists for a long time. Below are the different ways to identify and retrieve SQL Server Blocking Report:
Execute the below script, capture the details and analyze these details to identify the root cause then we can provide the resolution based on the root cause.
SELECT
CASE WHEN
CAST( LTRIM(RTRIM(s.blocked)) AS SMALLINT) > 0
THEN 'Waiting / Blocked'
ELSE 'Blocking' End AS 'Process_Type',
LTRIM(RTRIM(s.spid)) AS 'SPID',
LTRIM(RTRIM(s.blocked)) AS 'Blocked',
LTRIM(RTRIM(s.cpu)) AS 'CPU',
db_name(LTRIM(RTRIM(s.dbid))) AS 'DBName',
LTRIM(RTRIM(s.login_time)) AS 'Login_Time',
LTRIM(RTRIM(s.last_batch)) AS 'Last_Batch',
LTRIM(RTRIM(s.status)) AS 'Status',
LTRIM(RTRIM(s.loginame)) AS 'LoginName',
LTRIM(RTRIM(s.hostname)) AS 'HostName',
LTRIM(RTRIM(s.program_name)) AS 'ProgramName',
LTRIM(RTRIM(s.cmd)) AS 'CMD',
LTRIM(RTRIM(EST.TEXT)) AS 'Full_Query',
LTRIM(RTRIM(s.waittime)) AS 'Wait_Time',
LTRIM(RTRIM(s.lastwaittype)) AS 'Wait_Type',
LTRIM(RTRIM(s.waitresource)) AS 'Wait_Resource',
LTRIM(RTRIM(s.cpu)) AS 'CPU_Time(MS)',
LTRIM(RTRIM(s.physical_io)) AS 'Disk R/W',
LTRIM(RTRIM(s.memusage)) AS 'Mem_Usage(Total_Pages)',
LTRIM(RTRIM(s.open_tran)) AS 'NoOfOpenTran',
LTRIM(RTRIM(s.nt_domain)) AS 'Windows_Domain',
LTRIM(RTRIM(s.nt_username)) AS 'Windows_UserName'
FROM sys.sysprocesses s
CROSS APPLY sys.dm_exec_sql_text(s.sql_handle)EST
WHERE spid in(select spid from sys.sysprocesses where blocked<>0) or
spid in(select blocked from sys.sysprocesses);
Script to Get SQL Server Blocking Report – Detailed:
Above script can get the maximum information. But sometimes we can see that the blocking might occur between two stored procedures. In that case the above script returns the entire stored procedure code instead of the exact query. Below script can help us in identifying the exact SQL Statement that is blocked / blocking from the stored procedure.
SELECT
CASE WHEN
CAST( LTRIM(RTRIM(s.blocked)) AS SMALLINT) > 0
THEN 'Waiting / Blocked'
ELSE 'Blocking' End AS 'Process_Type',
LTRIM(RTRIM(s.spid)) AS 'SPID',
LTRIM(RTRIM(s.blocked)) AS 'Blocked',
db_name(LTRIM(RTRIM(s.dbid))) AS 'DBName',
LTRIM(RTRIM(s.login_time)) AS 'Login_Time',
LTRIM(RTRIM(s.last_batch)) AS 'Last_Batch',
LTRIM(RTRIM(s.status)) AS 'Status',
LTRIM(RTRIM(s.loginame)) AS 'LoginName',
LTRIM(RTRIM(s.hostname)) AS 'HostName',
LTRIM(RTRIM(s.program_name)) AS 'ProgramName',
LTRIM(RTRIM(s.cmd)) AS 'CMD',
ER.[statement_start_offset] AS 'Statement_Start',
ER.[statement_end_offset] AS 'Statement_End',
EST.TEXT AS 'Full_Query',
CASE
WHEN ER.[statement_start_offset] > 0 THEN
CASE ER.[statement_end_offset]
WHEN -1 THEN
SUBSTRING(EST.TEXT, (ER.[statement_start_offset]/2) + 1, 2147483647)
ELSE
SUBSTRING(EST.TEXT, (ER.[statement_start_offset]/2) + 1, (ER.[statement_end_offset] - ER.[statement_start_offset])/2)
END
ELSE
CASE ER.[statement_end_offset]
WHEN -1 THEN
RTRIM(LTRIM(EST.[text]))
ELSE
LEFT(EST.TEXT, (ER.[statement_end_offset]/2) +1)
END
END AS 'Exact_Statement',
LTRIM(RTRIM(s.waittime)) AS 'Wait_Time',
LTRIM(RTRIM(s.lastwaittype)) AS 'Wait_Type',
LTRIM(RTRIM(s.waitresource)) AS 'Wait_Resource',
LTRIM(RTRIM(s.cpu)) AS 'CPU_Time(MS)',
LTRIM(RTRIM(s.physical_io)) AS 'Disk R/W',
LTRIM(RTRIM(s.memusage)) AS 'Mem_Usage(Total_Pages)',
LTRIM(RTRIM(s.open_tran)) AS 'NoOfOpenTran',
LTRIM(RTRIM(s.nt_domain)) AS 'Windows_Domain',
LTRIM(RTRIM(s.nt_username)) AS 'Windows_UserName'
FROM sys.dm_exec_requests ER
CROSS APPLY sys.dm_exec_sql_text(ER.[sql_handle]) EST
INNER JOIN sys.sysprocesses s ON ER.session_id = s.spid
WHERE ER.session_id IN
(SELECT spid FROM sys.sysprocesses WHERE blocked<>0
UNION
SELECT blocked FROM sys.sysprocesses)
ORDER BY ER.[session_id], ER.[request_id];
