Updating linked database c

However, if all of a row's data cannot be inserted into a single data block or if an update to an existing row causes the row to outgrow its data block, then Oracle stores the row using multiple row pieces.

A data block usually contains only one row piece for each row.

You can also specify table columns for which data is encrypted before being stored in the datafile.identifies each row piece by its location or address.After they are assigned, a given row piece retains its rowid until the corresponding row is deleted or exported and imported using Oracle utilities.The column length requires 1 byte for columns that store 250 bytes or less, or 3 bytes for columns that store more than 250 bytes, and precedes the column data.Space required for column data depends on the datatype.

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