what is row chaining and row migration?

Answer Posted / 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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