---
title: "TransactionLog Event Class | Microsoft Docs"
ms.custom: ""
ms.date: "06/13/2017"
ms.prod: "sql-server-2014"
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ms.technology: supportability
ms.topic: conceptual
topic_type: 
  - "apiref"
helpviewer_keywords: 
  - "TransactionLog event class"
ms.assetid: bbcf09c6-3128-4775-b3de-e986a70411e0
author: stevestein
ms.author: sstein
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---
# TransactionLog Event Class
  Use the TransactionLog event class to monitor activity in the transaction logs in an instance of the [!INCLUDE[ssDEnoversion](../../includes/ssdenoversion-md.md)].  
  
## TransactionLog Event Class Data Columns  
  
|Data column name|Data type|Description|Column ID|Filterable|  
|----------------------|---------------|-----------------|---------------|----------------|  
|ApplicationName|`nvarchar`|Name of the client application that created the connection to an instance of [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)]. This column is populated with the values passed by the application rather than the displayed name of the program.|10|Yes|  
|BinaryData|`image`|Binary value dependent on the event class captured in the trace.|2|Yes|  
|ClientProcessID|`int`|ID assigned by the host computer to the process where the client application is running. This data column is populated if the client provides the client process.|9|Yes|  
|DatabaseID|`int`|ID of the database where the data is being logged.|3|Yes|  
|DatabaseName|`nvarchar`|Name of the database in which the user statement is running.|35|Yes|  
|EventClass|`int`|Type of event = 54.|27|No|  
|EventSequence|`int`|Sequence of a given event within the request.|51|No|  
|EventSubClass|`int`|Type of event subclass.|21|Yes|  
|GroupID|`int`|ID of the workload group where the SQL Trace event fires.|66|Yes|  
|HostName|`nvarchar`|Name of the computer on which the client is running. This data column is populated if the client provides the host name. To determine the host name, use the HOST_NAME function.|8|Yes|  
|IndexID|`int`|ID for the index on the object affected by the event. To determine the index ID for an object, use the index_id column of the sys.indexes catalog view.|24|Yes|  
|IntegerData|`int`|Integer value dependent on the event class captured in the trace.|25|Yes|  
|IsSystem|`int`|Indicates whether the event occurred on a system process or a user process. 1 = system, 0 = user.|60|Yes|  
|LoginName|`nvarchar`|Name of the login of the user (either [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] security login or the [!INCLUDE[msCoName](../../includes/msconame-md.md)] Windows login credentials in the form of DOMAIN\username).|11|Yes|  
|LoginSid|`image`|Security identifier (SID) of the logged-in user. You can find this information in the sys.server_principals catalog view. Each SID is unique for each login in the server.|41|Yes|  
|NTDomainName|`nvarchar`|Windows domain to which the user belongs.|7|Yes|  
|NTUserName|`nvarchar`|Windows user name.|6|Yes|  
|ObjectID|`int`|System-assigned ID of the object.|22|Yes|  
|RequestID|`int`|ID of the request containing the statement.|49|Yes|  
|ServerName|`nvarchar`|Name of the instance of [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] being traced.|26|No|  
|SessionLoginName|`nvarchar`|Login name of the user who originated the session. For example, if you connect to [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] using Login1 and execute a statement as Login2, SessionLoginName shows Login1 and LoginName shows Login2. This column displays both [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] and Windows logins.|64|Yes|  
|SPID|`int`|ID of the session on which the event occurred.|12|Yes|  
|StartTime|`datetime`|Time at which the event started, if available.|14|Yes|  
|TransactionID|`bigint`|System-assigned ID of the transaction.|4|Yes|  
  
## See Also  
 [sp_trace_setevent (Transact-SQL)](/sql/relational-databases/system-stored-procedures/sp-trace-setevent-transact-sql)   
 [The Transaction Log (SQL Server)](../logs/the-transaction-log-sql-server.md)