您好,登錄后才能下訂單哦!
session:
Because every login requires a session, this parameter effectively determines the maximum number of concurrent users in the system. You should always set this parameter explicitly to a value equivalent to your estimate of the maximum number of concurrent users, plus the number of background processes, plus approximately 10% for recursive sessions.
12c (1.5 * PROCESSES) + 22
ALTER SYSTEM can be used in a PDB only to change the value of the SESSIONS parameter for that PDB. (僅限在PDB中修改)
For a CDB, the root container's SESSIONS parameter specifies the total number of sessions for the database.
the SESSIONS parameter does not count recursive sessions and hence does not require the 10% adjustment.
process --- 針對的操作系統進程(這里不做詳述,專屬和共享模式),而session是db層,兩個概念不同。
這里涉及到的試圖有:(其中概念可以查看官檔)
gv$session
gv$process
v$resource_limit
v$license
---這里有個捷徑提醒下,修改這個參數一般人會重啟cdb,但是其實可以在某個節點修改sessions,然后shutdown immediate(當然要快速生效也可以shutdown abort)其中一個cdb節點,然后startup,同樣可以生效,但是記得要在把這個節點運行的service要start。
免責聲明:本站發布的內容(圖片、視頻和文字)以原創、轉載和分享為主,文章觀點不代表本網站立場,如果涉及侵權請聯系站長郵箱:is@yisu.com進行舉報,并提供相關證據,一經查實,將立刻刪除涉嫌侵權內容。