Transaction Log Usage By Session ID

A script to show the log usage on a per session basis, which can be useful when determining the potential impact of a query. It can be good to know for example if a session has generated a lot of log entries, and therefore killing that sessions would take a substantial amount of time. I bring this up because sometimes a session may have been running for a long time, but it might not have actual done anything that requires rollback.

--http://jongurgul.com/blog/transaction-log-usage-session-id/
SELECT 
 DB_NAME(tdt.[database_id]) [DatabaseName]
,d.[recovery_model_desc] [RecoveryModel]
,d.[log_reuse_wait_desc] [LogReuseWait]
,es.[original_login_name] [OriginalLoginName]
,es.[program_name] [ProgramName]
,es.[session_id] [SessionID]
,er.[blocking_session_id] [BlockingSessionId]
,er.[wait_type] [WaitType]
,er.[last_wait_type] [LastWaitType]
,er.[status] [Status]
,tat.[transaction_id] [TransactionID]
,tat.[transaction_begin_time] [TransactionBeginTime]
,tdt.[database_transaction_begin_time] [DatabaseTransactionBeginTime]
--,tst.[open_transaction_count] [OpenTransactionCount] --Not present in SQL 2005
,CASE tdt.[database_transaction_state]
 WHEN 1 THEN 'The transaction has not been initialized.'
 WHEN 3 THEN 'The transaction has been initialized but has not generated any log records.'
 WHEN 4 THEN 'The transaction has generated log records.'
 WHEN 5 THEN 'The transaction has been prepared.'
 WHEN 10 THEN 'The transaction has been committed.'
 WHEN 11 THEN 'The transaction has been rolled back.'
 WHEN 12 THEN 'The transaction is being committed. In this state the log record is being generated, but it has not been materialized or persisted.'
 ELSE NULL --http://msdn.microsoft.com/en-us/library/ms186957.aspx
 END [DatabaseTransactionStateDesc]
,est.text [StatementText]
,tdt.[database_transaction_log_record_count] [DatabaseTransactionLogRecordCount]
,tdt.[database_transaction_log_bytes_used] [DatabaseTransactionLogBytesUsed]
,tdt.[database_transaction_log_bytes_reserved] [DatabaseTransactionLogBytesReserved]
,tdt.[database_transaction_log_bytes_used_system] [DatabaseTransactionLogBytesUsedSystem]
,tdt.[database_transaction_log_bytes_reserved_system] [DatabaseTransactionLogBytesReservedSystem]
,tdt.[database_transaction_begin_lsn] [DatabaseTransactionBeginLsn]
,tdt.[database_transaction_last_lsn] [DatabaseTransactionLastLsn]
FROM sys.dm_exec_sessions es
INNER JOIN sys.dm_tran_session_transactions tst ON es.[session_id] = tst.[session_id]
INNER JOIN sys.dm_tran_database_transactions tdt ON tst.[transaction_id] = tdt.[transaction_id]
INNER JOIN sys.dm_tran_active_transactions tat ON tat.[transaction_id] = tdt.[transaction_id]
INNER JOIN sys.databases d ON d.[database_id] = tdt.[database_id]
LEFT OUTER JOIN sys.dm_exec_requests er ON es.[session_id] = er.[session_id]
LEFT OUTER JOIN sys.dm_exec_connections ec ON ec.[session_id] = es.[session_id]
--AND ec.[most_recent_sql_handle] <> 0x
OUTER APPLY sys.dm_exec_sql_text(ec.[most_recent_sql_handle]) est
--WHERE tdt.[database_transaction_state] >= 4
ORDER BY tdt.[database_transaction_begin_lsn]

Leave a Reply