If you provide a high percentage value, such as 99, indexes are compacted, and any new index inserts result in splitting nodes. The maximum density is 100 percent. With a 100-percent FILLFACTOR value, the index has no room available for growth; any addition to the index results in splitting the nodes.
A 99-percent FILLFACTOR value allows room for at least one insertion per node. A high percentage value can result in faster queries and is appropriate for indexes that you do not expect to grow, or for mostly read-only indexes.
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