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Answer :
Reorganize if the logical fragmentation is between 5 and 30 percent. This is a suggested threshold for performing index fragmentation maintenance. The correct option is d. Reorganize if the logical fragmentation is between 5 and 30 percent.
Index fragmentation occurs when the logical order of pages in an index does not match the physical order of pages on disk. This can lead to slower query performance and increased storage requirements. To address index fragmentation, maintenance tasks such as rebuilding or reorganizing the index can be performed.
In the given options, option d is the suggested threshold for performing index fragmentation maintenance. Reorganizing is recommended if the logical fragmentation is between 5 and 30 percent. This means that the index is still somewhat fragmented, but not to the point where a full rebuild is necessary.
Option a suggests deleting and recreating the index if the fragmentation is more than 10 percent. This is a drastic measure and not typically recommended for routine maintenance.
Option b suggests updating statistics for fragmentation more than 30 percent. While updating statistics can help with query performance, it is not a direct solution to index fragmentation.
Option c suggests rebuilding the index if the fragmentation is less than 5 percent. This is not necessary for a minimally fragmented index and can be time-consuming and resource-intensive. The correct option is d. Reorganize if the logical fragmentation is between 5 and 30 percent.
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