View the Exhibit and examine the setting for a table. Which statement is true about the PCTFREE setting for the table?

Chained rows result from rows that are too large for a single block and span multiple blocks; PCTFREE does not reserve space for chained row piece pointers from other blocks.

PCTFREE reserves a defined percentage of each data block so that UPDATE statements which increase row size have space to grow without causing row migration or chaining. When a block fills to the point where only PCTFREE percent of space remains, the Oracle server stops placing new rows into that block and marks it unavailable for inserts. This mechanism protects write performance by reducing the need for row migration across blocks.

PCTFREE has no involvement with bitmap structures; bitmaps in Oracle are associated with bitmap indexes or the bitmap space management used in locally managed tablespaces.

This description more accurately reflects PCTUSED, which defines the minimum percentage of used space that must be reached after rows are deleted before Oracle re-adds the block to the freelist for new row inserts.