What does the PCTFREE parameter specify?

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What does the PCTFREE parameter specify?

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The PCTFREE parameter specifies the percentage space of a data block that can be used for storing updates to existing rows in the data block. When the space allocated for updating existing rows of the block is filled, no new updates are possible. At such point, only new rows can be inserted into the block. The block is again available for updating existing rows of the block only when the used space falls below the PCTFREE mark.


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