SQL Server – Extended Events Deadlock XML Report Too Short

deadlockextended-eventssql server

How can I tell the sql server to log the whole query in the xml, and not truncate it?

example:

   <inputbuf>
(@0 nvarchar(20),@1 nvarchar(10),@2 decimal(38,20),@3 int,@4 datetime,@5 nvarchar(10))IF EXISTS(SELECT TOP 1 NULL FROM "MySQLDB".dbo."MyTable$Reservation Entry" WITH(UPDLOCK)  WHERE ("Item No_"=@0 AND "Location Code"=@1 AND "Quantity (Base)"&gt;@2 AND "Reservation Status"=@3 AND "Expected Receipt Date"&lt;=@4 AND "Variant Code"=@5)) SELECT "timestamp","Entry No_","Positive","Item No_","Location Code","Quantity (Base)","Reservation Status","Description","Creation Date","Transferred from Entry No_","Source Type","Source Subtype","Source ID","Source Batch Name","Source Prod_ Order Line","Source Ref_ No_","Item Ledger Entry No_","Expected Receipt Date","Shipment Date","Serial No_","Created By","Changed By","Qty_ per Unit of Measure","Quantity","Binding","Suppressed Action Msg_","Planning Flexibility","Appl_-to Item Entry","Warranty Date","Expiration Date","Qty_ to Handle (Base)","Qty_ to Invoice (Base)","Quantity Invoiced (Base)","New Serial No_","New Lot No_","Disallow Cancellation","Lot No_","Vari   </inputbuf>
  </process>

this is taken from sql server management studio 17.4, management, extended events, sessions, system_health, package0.event_file event detail xml_report value. As you can see the query shown is truncated. Is there a way to tell SQL to log all of the query without truncating it?

If there isn't a way to tell sql not truncate, what is the best way of retrieving the whole query?

Thank you

Best Answer

If there isn't a way to tell sql not truncate, what is the best way of retrieving the whole query

Every deadlock graph contains sqlhandle for every process that partecipates and it can be used to retrieve sql_text:

select *
from sys.dm_exec_sql_text(0x01000c001247710230b2bfa34800000000000000000000000000000000000000000000000000000000000000)

where the value for parameter for sys.dm_exec_sql_text is the sqlhandle from deadlock graph.

This way you may get your statement if its execution plan is still in cache.

You need the VIEW SERVER STATE permission to query sys.dm_exec_sql_text.

Related Solutions

Sql-server – Querying Extended Events in SQL Server 2008

Try to play with this example:

CREATE EVENT SESSION
[statement_completed_file]
ON SERVER
ADD EVENT
    sqlserver.sp_statement_completed,
ADD EVENT
    sqlserver.sql_statement_completed
    (
        ACTION 
        (
            sqlserver.sql_text
        )
        WHERE
        (
            sqlserver.session_id <> 53
        )
    )
ADD TARGET package0.asynchronous_file_target
    (
        set filename=N'C:\stats.xel', 
        metadatafile=N'C:\stats.xem'
    )
WITH
(
    MAX_MEMORY=4096KB,
    EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,
    MAX_DISPATCH_LATENCY=1 SECONDS,
    TRACK_CAUSALITY=OFF,
    STARTUP_STATE=OFF
)
GO
ALTER EVENT SESSION [statement_completed_file]
ON SERVER
STATE=START
GO
SELECT event_data, 
    event_data.value('(event/@name)[1]', 'varchar(50)') AS event_name,
    event_data.value('(event/data/value)[1]', 'bigint') AS source_database_id,
    event_data.value('(event/data/value)[2]', 'bigint') AS object_id,
    event_data.value('(event/data/value)[3]', 'bigint') AS object_type,
    event_data.value('(event/data/value)[4]', 'bigint') AS cpu,
    event_data.value('(event/data/value)[5]', 'bigint') AS duration,
    event_data.value('(event/data/value)[6]', 'bigint') AS reads,
    event_data.value('(event/data/value)[7]', 'bigint') AS writes,
    event_data.value('(event/action/value)[1]', 'nvarchar(max)') AS sql_text
FROM 
(
    SELECT CAST(event_data AS XML) AS event_data
    FROM sys.fn_xe_file_target_read_file('C:\stats*.xel', 'C:\stats*.xem', null, null)
) tbl
GO
DROP EVENT SESSION [statement_completed_file] ON SERVER
GO

SQL Server 2012 – Troubleshooting Extended Events for Selective XML Indexing

Not sure what you are seeing and not seeing in the event log but it works as expected for me (version 11.0.3000).

The mistake you did with your extra path expressions is that you forgot Stuff in the path.

Testing this with the extended events and looking at the execution plan for operator Table Valued Function XML Reader ... (there should be none), I found that one extra path is enough for your queries to make it use only the index to fetch the data [4] = '/Root/Stuff/Forms' as SQL nvarchar(25). You can have [3] = '/Root/Stuff/Forms' as XQUERY 'node()' in there as well and perhaps it will make a difference or not depending on what your XML look like.

Note 1: You have mixed up the names of the columns in the index and your query. That might contribute to the problems you have with extended event.

Note 2: The events for missing selective XML indexes is generated when the query is compiled. If the query plan is used from the cache you will not see any events.

Best Answer

Related Solutions

Sql-server – Querying Extended Events in SQL Server 2008

SQL Server 2012 – Troubleshooting Extended Events for Selective XML Indexing

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