TRUNCATE and ROLLBACK
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Comments posted to this topic are about the item TRUNCATE and ROLLBACK
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Easy ..!!
Thanks for the question.
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A good one for beginners to cut their teeth on.
Thank you for the question.
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And time to get coffee
Just because you're right doesn't mean everybody else is wrong. -
+1
And thanks Sergey for good explanation.
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Thanks for a simple one to start the week.
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For those who thought this was easy: I previously worked with Oracle databases where TRUNCATE cannot be rolled back. I got this one right because I had previously been surprised by this difference in behavior.
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tom.w.brannon (8/22/2016)
For those who thought this was easy: I previously worked with Oracle databases where TRUNCATE cannot be rolled back. I got this one right because I had previously been surprised by this difference in behavior.People sometimes forget that TRUNCATE is considered DDL, not DML. Oracle does an auto-commit of everything pending when you fire any DDL, then fires the DDL. Most people remember this after it happens once.
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Most people remember this after it happens once.
I'm not like most people.
It's been over 15 years since I've worked in an Oracle environment and I still forget. (:
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Great back to basics question. We have seen this topic on QOTD many times. Still quite shocking that at the time of my comment there are 33% of the answers thinking that TRUNCATE will not be rolled back.
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Sean Lange (8/22/2016)
Great back to basics question. We have seen this topic on QOTD many times. Still quite shocking that at the time of my comment there are 33% of the answers thinking that TRUNCATE will not be rolled back.I agree that's shocking, but I'm even more shocked that 8% of answers believe that DELETE will not be rolled back.
Of course it's interesting that no DML trigger for TRUNCATE TABLE is supported because, although it's a DML statement, truncation is not in any DML Event Group because it isn't a DML Event. Seems a bit strange to me that the effect of a DML statement can somehow not be a DML event.
Tom
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TomThomson (8/22/2016)
Sean Lange (8/22/2016)
Great back to basics question. We have seen this topic on QOTD many times. Still quite shocking that at the time of my comment there are 33% of the answers thinking that TRUNCATE will not be rolled back.I agree that's shocking, but I'm even more shocked that 8% of answers believe that DELETE will not be rolled back.
Of course it's interesting that no DML trigger for TRUNCATE TABLE is supported because, although it's a DML statement, truncation is not in any DML Event Group because it isn't a DML Event. Seems a bit strange to me that the effect of a DML statement can somehow not be a DML event.
But TRUNCATE is not a DML statement. It is a DDL statement. While I have always thought it bizarre that it isn't a DML statement but it is well documented that isn't. You can capture truncate using an AUDIT in 2008+.
_______________________________________________________________
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 Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.
Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/ -
Easy one, thanks.
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