Comments on: Row Migration and Row Movement http://blog.fatalmind.com/2010/02/23/row-migration-and-row-movement/ Markus Winand's blog about Performance, Reliability, Maintainability, Scalability and more Tue, 27 Sep 2011 23:33:53 +0000 hourly 1 http://wordpress.com/ By: Markus Winand http://blog.fatalmind.com/2010/02/23/row-migration-and-row-movement/#comment-136 Thu, 27 May 2010 10:20:18 +0000 http://myfatalmind.wordpress.com/?p=193#comment-136 Hi Anand,

I believe there is some disagreement in the field if data actually differs after a row migration in comparison to a “truly chained row”. My personal opinion is that there isn’t any difference, once the process has been completed.

However, the test I have done so far, is to check if the very first table column is in the block where it should be according to the ROWID. If it’s not there, it is probably a case of Row Migration.

]]> By: Anand http://blog.fatalmind.com/2010/02/23/row-migration-and-row-movement/#comment-133 Sun, 23 May 2010 04:45:57 +0000 http://myfatalmind.wordpress.com/?p=193#comment-133 Hi,
It was great to have read the blog.I wanted to know,how do know whether a row is chained or migrated?Is there a way to differentiate?Is ‘table fetch continued row’ wait event, correct to predict that the row has been migrated, not chained?In what cases are rows chained?

Regards,
Anand

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