Answer / daman

We will migrate a row when an update to that row would cause
it to not fit on the block anymore (with all of the other
data that exists there currently). A migration means that
the entire row will move and we just leave behind the
«forwarding address». So, the original block just has the
rowid of the new block and the entire row is moved.
Row chaining nstead of just having a forwarding address on
one block and the data on another we have data on two or
more blocks.

Answer / nitun

Row Chaining happens when a row is too large to fit into a
single database block. For example, if you use a 8KB block
size for your database and you need to insert a row of 16KB
into it, Oracle will use 2/3 blocks and store the row in
chain of data blocks for that segment. And Row Chaining
happens only when the row is being inserted

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