The optdiag command displays statistics for tables, indexes, and columns, including the size of tables and indexes. If you are performing query tuning, optdiag provides the best tool for viewing all the statistics you need. Here is a sample report for the titles table in the pubtune database:
Table owner: "dbo"
Statistics for table: "titles"
Data page count: 662
Empty data page count: 10
Data row count: 4986.0000000000000000
Forwarded row count: 18.0000000000000000
Deleted row count: 87.0000000000000000
Data page CR count: 86.0000000000000000
OAM + allocation page count: 5
First extent data pages: 3
Data row size: 238.8634175691937287
See Chapter 2, “Statistics Tables and Displaying Statistics with optdiag,” in Performance and Tuning Series: Improving Performance with Statistical Analysis.