The database stores rows in data blocks. Each row of a table containing data for less than 256 columns is contained in one or more row pieces.

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If possible, Oracle Database stores each row as one row piece. However, if all of the row 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 the database stores the row using multiple row pieces.

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Rows in a table cluster contain the same information as rows in nonclustered tables. Additionally, rows in a table cluster contain information that references the cluster key to which they belong.

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See also

“Data Block Format” to learn about the components of a data block

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