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SQL Server 2008
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SQL Server 2008 - General
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how can we know the deleted userinformation...
how can we know the deleted userinformation on a particular table in DB
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raghavatgk
raghavatgk
Posted Monday, September 17, 2012 7:10 AM
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Hi ,
in last couple of days, one table is truncating means its having zero records init.
it is very useful table to our process. but it is truncating in last couple of days.
my question how can we know the information of a user who truncating the table . may be it is a sqlserver Agent.
Please let me know in case of any additional data required.
Thanks in advance.
Post #1360175
Bobby Glover
Bobby Glover
Posted Monday, September 17, 2012 7:16 AM
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The easiest way is to either set up a trigger to log delete actions or to set up SQL PROFILER to capture the activity on this table.
If you had a Forgein Key constarint on the table it wouldn't allow the truncate to run.
Post #1360181
tim_harkin
tim_harkin
Posted Monday, September 17, 2012 7:21 AM
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Not sure if a delete trigger solves the problem, because TRUNCATE is non-logged. That is why it is so quick, but also why it requires elevated permissions.
Is it truly a truncate or a DELETE *?
Post #1360186
raghavatgk
raghavatgk
Posted Monday, September 17, 2012 7:27 AM
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not sure, but it is having only emply data in it.!!!
Post #1360193
balajisrm
balajisrm
Posted Monday, September 17, 2012 7:41 AM
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As you say that this data in the table is getting deleted only for the last couple of days,
Kindly check the recently deployed codes (Stored Procedures, Patches) for the week if possible. If truncate is used you cannot do anything. Try to add a constraint to the table or fira trigger ON DELETE for the table. This can help you to find the culprit.
Post #1360203
Sean Lange
Sean Lange
Posted Monday, September 17, 2012 7:58 AM
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tim_harkin (9/17/2012)
Not sure if a delete trigger solves the problem, because TRUNCATE is non-logged. That is why it is so quick, but also why it requires elevated permissions.
Is it truly a truncate or a DELETE *?
To be clear a TRUNCATE IS logged. Every action in sql is logged (ACID). A TRUNCATE logs the pages not the individual rows, that is why it so much faster.
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Post #1360221
Sean Lange
Sean Lange
Posted Monday, September 17, 2012 8:03 AM
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balajisrm (9/17/2012)
As you say that this data in the table is getting deleted only for the last couple of days,
Kindly check the recently deployed codes (Stored Procedures, Patches) for the week if possible. If truncate is used you cannot do anything. Try to add a constraint to the table or fira trigger ON DELETE for the table. This can help you to find the culprit.
All is not lost if it is a truncate. You can still use DDL triggers to capture the truncate and either prevent it or log it.
_______________________________________________________________
Need help? Help us help you.
Read the article at
http://www.sqlservercentral.com/articles/Best+Practices/61537/
for best practices on asking questions.
Need to split a string? Try Jeff Moden's
splitter
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Cross Tabs and Pivots, Part 1 – Converting Rows to Columns
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs
Post #1360223
Lynn Pettis
Lynn Pettis
Posted Monday, September 17, 2012 8:07 AM
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As Sean said, TRUNCATE is a logged operation. TRUNCATE, however, does not fire DELETE triggers on tables. If you need to know who is deleting data from the table, you will need to setup a server-side trace or use extended events to capture that information.
Lynn Pettis
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Post #1360227
raghavatgk
raghavatgk
Posted Monday, September 17, 2012 8:35 AM
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Thanks Lynn and to others.
I have been created to Trace file which capture the transacations performed on table by any user...
Thanks again!!!
Post #1360245
Grant Fritchey
Grant Fritchey
Posted Monday, September 17, 2012 8:35 AM
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Since this is a 2008 forum, let's go with extended events or change data capture. Either of these will let you know who modified data. Triggers are incomplete and can be very resource intensive. Profiler should not be run against a production system. Server-side traces (scripted components of Profiler) are OK, but not as lightweight as extended events. I'd go with extended events.
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Post #1360246
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