下面是下面的一栏。我对过盈功能不太熟悉。问题是,列usage_change_mb是每日变化(来自每日快照)还是评估所有快照的平均变化?( LAST_VALUE ( reservedpages ) OVER ( PARTITION BY instance_name, database_name ORDER BY instance_name ASC, database_name ASC, snapshot_time ASC ROWS BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING )
FIRST_VALU