简单查看oracle历史会话图表
如图所示
可在plsql中形成线形图
时间范围/节点自己改一下
set linesize 300
SELECT
TO_CHAR(TRUNC(ash.sample_time, 'MI'), 'YYYY-MM-DD HH24:MI') AS minute_interval,
ash.snap_id,
ash.instance_number AS inst_id,
COUNT(DISTINCT ash.session_id) AS active_sessions,
res.resource_name,
res.current_utilization,
res.max_utilization,
res.INITIAL_ALLOCATION
FROM
DBA_HIST_ACTIVE_SESS_HISTORY ash
JOIN
DBA_HIST_RESOURCE_LIMIT res ON ash.snap_id = res.snap_id AND ash.instance_number = res.instance_number
where ash.sample_time>to_date('2024-04-12 11:00:00','yyyy-MM-dd HH24:mi:ss') and ash.sample_time<to_date('2024-04-13 00:15:00','yyyy-MM-dd HH24:mi:ss') and ash.INSTANCE_NUMBER=2
and res.resource_name in ('processes','sessions')
GROUP BY
TO_CHAR(TRUNC(ash.sample_time, 'MI'), 'YYYY-MM-DD HH24:MI'),
ash.snap_id,
ash.instance_number,
res.resource_name,
res.current_utilization,
res.max_utilization,
res.INITIAL_ALLOCATION
ORDER BY
TO_CHAR(TRUNC(ash.sample_time, 'MI'), 'YYYY-MM-DD HH24:MI'),
ash.snap_id,
ash.instance_number;
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