You update the statistics that the SQL Optimizer uses to select the optimum access strategy.
· The database instance is in operational state ONLINE.
·
· XUSER entries must exist or the environment variable SQLOPT must be set as follows: SQLOPT="-d <database_name> -u <database_user>,<database_user_password>"
xpu -s [-u] count
-s |
Update statistics for the SQL Optimizer |
-u |
Only in combination with the option –s; all tables in the database are checked. If this option is not set, only those tables whose size has changed most since the last check are analyzed. |
count |
Maximum number of parallel tasks; 1 < count < 50 |
Updating the Optimizer statistics for all tables:
xpu –s -u 10
See also:
Concepts of the MaxDB Database System, SQL Optimizer
Database Manager CLI, Updating the Optimizer Statistics with the XPU Program