tsingleeµÄÖíȦ

For example:
BEGIN
DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS( retention => 43200,
interval => 30, topnsql => 100, dbid => 3310949047);
END;
/

setting affects how often in minutes that snapshots are automatically
generated. The RETENTION setting affects how long in minutes that snapshots are
stored in the workload repository. The TOPNSQL setting affects the number of Top SQL
to flush for each SQL criteria (Elapsed Time, CPU Time, Parse Calls, Shareable
Memory, and Version Count).