sp_show_statistics (SQL Server Compact)
The stored procedure sp_show_statistics displays the current distribution statistics for the specified table and index, or for all tables and indexes.
Syntax
sp_show_statistics [ 'table_name' ] , [ 'index_name' ]
Arguments
table_name
The name of the table for which you want to display statistics. If you do not specify a table name, the statistics for all tables and indexes in the database are returned.index_name
The name of the index on which you want statistics. If you do not specify an index name, all indexes in the specified table are returned.
Result Set
The following table describes the columns returned in the result set.
Column Name |
Description |
|---|---|
TABLE |
The table that was specified. |
INDEX |
The index that was specified. |
UPDATED |
The date and time when the statistics were last updated. |
ROWS |
The number of rows in the table. |
ROWS_SAMPLED |
The number of rows that were used to calculate the statistics information. |
STEPS |
The number of distribution steps. |
DENSITY |
The selectivity of the first index column prefix. |
AVERAGE_KEY_LENGTH |
The average length of all index columns. |
RECOMPUTE |
A Boolean value. True indicates that this statistic will be automatically updated the next time it is used, if it is determined to be stale. |
STALE |
A Boolean value. True indicates that the query optimizer has determined that this statistic must be updated. If RECOMPUTE is true, this statistic will be automatically recomputed the next time that the query processor uses this statistic. |
Remarks
The results returned indicate the selectivity of an index. A lower density indicates greater selectivity. The results provide the basis for determining whether an index is useful to the query optimizer.
Example
The following example displays statistics information for all indexes on the Address table.
sp_show_statistics 'Employees'
See Also
Reference
sp_show_statistics_columns (SQL Server Compact)
sp_show_statistics_steps (SQL Server Compact)