Recentemente precisei descobrir bloqueio de processos no SQL Server de uma forma prática e simples. Na base de conhecimento onde fica todos os scripts que compartilhamos no grupo de DBA SQL Server, encontrei um script que faz exatamente o que estava procurando, sendo assim resolvi compartilhar aqui com vocês o script. Segue abaixo:
SET NOCOUNT ON GO SELECT SPID, BLOCKED, REPLACE (REPLACE (T.TEXT, CHAR(10), ' '), CHAR (13), ' ' ) AS BATCH INTO #T FROM sys.sysprocesses R CROSS APPLY sys.dm_exec_sql_text(R.SQL_HANDLE) T GO WITH BLOCKERS (SPID, BLOCKED, LEVEL, BATCH) AS ( SELECT SPID, BLOCKED, CAST (REPLICATE ('0', 4-LEN (CAST (SPID AS VARCHAR))) + CAST (SPID AS VARCHAR) AS VARCHAR (1000)) AS LEVEL, BATCH FROM #T R WHERE (BLOCKED = 0 OR BLOCKED = SPID) AND EXISTS (SELECT * FROM #T R2 WHERE R2.BLOCKED = R.SPID AND R2.BLOCKED <> R2.SPID) UNION ALL SELECT R.SPID, R.BLOCKED, CAST (BLOCKERS.LEVEL + RIGHT (CAST ((1000 + R.SPID) AS VARCHAR (100)), 4) AS VARCHAR (1000)) AS LEVEL, R.BATCH FROM #T AS R INNER JOIN BLOCKERS ON R.BLOCKED = BLOCKERS.SPID WHERE R.BLOCKED > 0 AND R.BLOCKED <> R.SPID ) SELECT N' ' + REPLICATE (N'| ', LEN (LEVEL)/4 - 1) + CASE WHEN (LEN(LEVEL)/4 - 1) = 0 THEN 'HEAD - ' ELSE '|------ ' END + CAST (SPID AS NVARCHAR (10)) + N' ' + BATCH AS BLOCKING_TREE FROM BLOCKERS ORDER BY LEVEL ASC GO DROP TABLE #T GO
Ao executar o script vocês poderão encontrar na primeira linha quem é a sessão principal que está bloqueando as outras sessões, chamada HEAD. Além disso você também terá acesso a query que está sendo executado por essa sessão.
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