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Oracle process和sessions 解释

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标签:process session

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. (仅限在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 --- 针对的操作系统进程(这里不做详述,专属和共享模式),而session是db层,两个概念不同。

这里涉及到的试图有:(其中概念可以查看官档)

gv$session
gv$process
v$resource_limit
v$license

Oracle process和sessions 解释

标签:process session

原文地址:http://blog.51cto.com/2012ivan/2107148

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