Constructing Database Statistics

Question

When and where should I use Database Statistics?  I'm trying to improve overall system performance.  Are there any cons to running this process?
Thank You All.

Answer 1

Yes BRCONNECT will collect DB stas on the tables as it determines appropriate based on monitoring criteria which actaull allows for DB stats to be refreshed based on some % of rows added to the table (default is 50%) since the last time stats were collected.
The Traffic light status of the performance tab simply checks to see if DB stats are missing on a fact or dimension table, setting the status to RED.  If the E fact table stats are more than 30 days old or 4 or more dimension table's stat are more than 30 days old, the status is set to yellow.  So yellow could mean your stats are really pretty accurate, or disastrously out of date.
I'd bring your DBA into the discussion so determeine the best course of action.
You can set the stats collection job in the performance tab to run automatically based on loads/deltas, or you could schedule the job to occur perhaps on weekends.  Better yet, setup a process chain to do it.  The main issue is probably whether you have time in your daily load window to refresh the stats.
If you set the option to collect stats after a load/delta, stats are only collected on teh F fact table and the dimension tables.  If you run the job yourself or schedule it, it will collect stats on both the F and E fact tables, the dimension tables, and all related master data tables.