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10/04/2012

sp_statistics (Transact-SQL)

Returns a list of all indexes and statistics on a specified table or indexed view.

Topic link icon Transact-SQL Syntax Conventions

Syntax

sp_statistics [ @table_name= ] 'table_name'  
          [ , [ @table_owner= ] 'owner' ] 
     [ , [ @table_qualifier= ] 'qualifier' ] 
     [ , [ @index_name= ] 'index_name' ] 
     [ , [ @is_unique= ] 'is_unique' ]
     [ , [ @accuracy= ] 'accuracy' ]

Arguments

[ @table_name= ] 'table_name'
Specifies the table used to return catalog information. table_name is sysname, with no default. Wildcard pattern matching is not supported.
[ @table_owner= ] 'owner'
Is the name of the table owner of the table used to return catalog information. table_owner is sysname, with a default of NULL. Wildcard pattern matching is not supported. If owner is not specified, the default table visibility rules of the underlying DBMS apply.

In SQL Server, if the current user owns a table with the specified name, the indexes of that table are returned. If owner is not specified and the current user does not own a table with the specified name, this procedure looks for a table with the specified name owned by the database owner. If one exists, the indexes of that table are returned.
[ @table_qualifier= ] 'qualifier'
Is the name of the table qualifier. qualifier is sysname, with a default of NULL. Various DBMS products support three-part naming for tables (qualifier**.owner.**name). In SQL Server, this parameter represents the database name. In some products, it represents the server name of the table's database environment.
[ @index_name= ] 'index_name'
Is the index name. index_name is sysname, with a default of %. Wildcard pattern matching is supported.
[ @is_unique= ] 'is_unique'
Is whether only unique indexes (if Y) are to be returned. is_unique is char(1), with a default of N.
[ @accuracy= ] 'accuracy'
Is the level of cardinality and page accuracy for statistics. accuracy is char(1), with a default of Q. Specify E to make sure that statistics are updated so that cardinality and pages are accurate.

The value E (SQL_ENSURE) asks the driver to unconditionally retrieve the statistics.

The value Q (SQL_QUICK) asks the driver to retrieve the cardinality and pages only if they are readily available from the server. In this case, the driver does not ensure that the values are current. Applications that are written to the Open Group standard will always get SQL_QUICK behavior from ODBC 3.x-compliant drivers.

Result Sets

Column name	Data type	Description
TABLE_QUALIFIER	sysname	Table qualifier name. This column can be NULL.
TABLE_OWNER	sysname	Table owner name. This column always returns a value.
TABLE_NAME	sysname	Table name. This column always returns a value.
NON_UNIQUE	smallint	NOT NULL. 0 = Unique 1 = Not unique
INDEX_QUALIFIER	sysname	Index owner name. Some DBMS products allow for users other than the table owner to create indexes. In SQL Server, this column is always the same as TABLE_NAME.
INDEX_NAME	sysname	Is the name of the index. This column always returns a value.
TYPE	smallint	This column always returns a value: 0 = Statistics for a table 1 = Clustered 2 = Hashed 3 = Nonclustered
SEQ_IN_INDEX	smallint	Position of the column within the index.
COLUMN_NAME	sysname	Column name for each column of the TABLE_NAME returned. This column always returns a value.
COLLATION	char(1)	Order used in collation. Can be: A = Ascending D = Descending NULL = Not applicable
CARDINALITY	int	Number of rows in the table or unique values in the index.
PAGES	int	Number of pages to store the index or table.
FILTER_CONDITION	varchar(128)	SQL Server does not return a value.

Return Code Values

None

Remarks

The indexes in the result set appear in ascending order by the columns NON_UNIQUE, TYPE, INDEX_NAME, and SEQ_IN_INDEX.

The index type clustered refers to an index in which table data is stored in the order of the index. This corresponds to SQL Server clustered indexes.

The index type Hashed accepts exact match or range searches, but pattern matching searches do not use the index.

sp_statistics is equivalent to SQLStatistics in ODBC. The results returned are ordered by NON_UNIQUE, TYPE, INDEX_QUALIFIER, INDEX_NAME, and SEQ_IN_INDEX. For more information, see the ODBC API Reference.

Permissions

Requires SELECT permission on the schema.

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