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 Originally Posted by Mohith123
Well lets get it straight...
I know that row chaining occurs when an insert is happening into a block and teh space inside that is not sufiicient then the row will be chained to another block...
Row migration will happen as the data grows....
Can you please take a minute and explain me how does row migration work...?
mmhhh... not exactly.
Row MIGRATION will occur when an update on affected row makes it grow large enough not fit anymore on the original block then the row gets migrated to a different block leaving behind a pointer.
Row CHAINING will occur when a row is larger than a single data block then the row will be split into more than one data block.
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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