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And each time a row is deleted from the table, SQL Server must remove a leaf-level row from every nonclustered index. Frequently, you have to perform DELETE and UPDATE operations on only one or a few rows that meet some search condition. Indexes can help SQL Server find the rows of interest, but as I noted earlier, they add overhead during the modification.

The trick is to have on your tables only the indexes that help SQL Server find the rows to modify but no extra indexes that add overhead to your data-modification operations.

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To know which indexes are the best for data-modification operations, you need to know how SQL Server uses indexes during those operations.

If the table is a heap, the bookmarks in the nonclustered-index leaf rows are the physical locations of the rows.

In SQL Server 2000 and 7.0, if a row in a heap moves to a new page, the row leaves a forwarding pointer in the original location.

When you're deciding which columns to build your clustered index on, remember that the nonclustered index pointers use the clustered-index key as a bookmark for locating the data row. If a row moves because it no longer fits on the original page, it still has the same row locator (i.e., the clustering key for the row stays the same), and SQL Server doesn't have to modify any nonclustered indexes.

As I've mentioned before, for a table that has a clustered index, the bookmark information in the leaf-level nonclustered index rows is the clustered-index key value.

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