sp_updatestats effectively executes UPDATE STATISTICS, by specifying the ALL keyword, against all user-defined and internal tables in the database. sp_updatestats displays messages that indicate its progress. When the update is completed, it reports that statistics have been updated for all tables. Statistics on disabled nonclustered indexes are also updated by sp_updatestats. sp_updatestats ignores tables with a disabled clustered index.
In SQL Server 2005, sp_updatestats updates only those statistics that require updating based on the rowmodctr information in the sys.sysindexes compatibility view; therefore, preventing unnecessary updates of unchanged items.
For databases with a compatibility level below 90, executing sp_updatestats resets the automatic UPDATE STATISTICS setting for all indexes and statistics on every table in the current database. For more information, see sp_autostats (Transact-SQL). For databases with a compatibility level of 90 or higher, sp_updatestats preserves the automatic UPDATE STATISTICS setting for any particular index or statistics.