SQL server queries
To check blocking sessions
Dbcc OpenTran will give only newest blocking session not all blocking sessions .
For all blocking sessions below query will give you
SELECT
[s_tst].[session_id],
[s_es].[login_name] AS [Login Name],
DB_NAME (s_tdt.database_id) AS [Database],
[s_tdt].[database_transaction_begin_time] AS [Begin Time],
[s_tdt].[database_transaction_log_bytes_used] AS [Log Bytes],
[s_tdt].[database_transaction_log_bytes_reserved] AS [Log Rsvd],
[s_est].text AS [Last T-SQL Text],
[s_eqp].[query_plan] AS [Last Plan]
FROM
sys.dm_tran_database_transactions [s_tdt]
JOIN
sys.dm_tran_session_transactions [s_tst]
ON
[s_tst].[transaction_id] = [s_tdt].[transaction_id]
JOIN
sys.[dm_exec_sessions] [s_es]
ON
[s_es].[session_id] = [s_tst].[session_id]
JOIN
sys.dm_exec_connections [s_ec]
ON
[s_ec].[session_id] = [s_tst].[session_id]
LEFT OUTER JOIN
sys.dm_exec_requests [s_er]
ON
[s_er].[session_id] = [s_tst].[session_id]
CROSS APPLY
sys.dm_exec_sql_text ([s_ec].[most_recent_sql_handle]) AS [s_est]
OUTER APPLY
sys.dm_exec_query_plan ([s_er].[plan_handle]) AS [s_eqp]
ORDER BY
[Begin Time] ASC;
GO
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