Using indexes (Part II)

Tools for designing indexes Statistics Fragmentation Indexes maintenance

Tools for designing indexes

• SQL Profiler • Database Engine Tuning Advisor • DBCC AUTOPILOT • Performance Dashboard Reports • Dynamic Management Views

Statistics

Column name Description

RANGE_HI_KEY Upper bound column value for a histogram step. The column value is also called a key value.

RANGE_ROWS Estimated number of rows whose column value falls within a histogram step, excluding the upper bound.

EQ_ROWS Estimated number of rows whose column value equals the upper bound of the histogram step.

DISTINCT_RANGE_ROWS Estimated number of rows with a distinct column value within a histogram step, excluding the upper bound.

AVG_RANGE_ROWS Average number of rows with duplicate column values within a histogram step, excluding the upper bound (RANGE_ROWS / DISTINCT_RANGE_ROWS for DISTINCT_RANGE_ROWS > 0).

Fragmentation

Maintenance

• sys.dm_db_index_physical_stats

• REBUILD • REORGANIZE • DISABLE • UPDATE STATISTICS • Maintenance plans

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