格式:在启动数据后修改
ALTER SYSTEM SET parameter_name = parameter_value
[COMMENT ‘text’] [SCOPE = MEMORY|SPFILE|BOTH]
[SID= ‘sid’|’*’]
parameter_name: Name of the parameter tobe changed
parameter_value: Value the parameter is being changed to
COMMENT: A comment to be added into the SPFILE next to the parameter being
altered。是一个注释。
SCOPE: Determines if change should be made in memory, SPFILE, or in both areas ,决定修改时在内存中还是在SPFILE中
MEMORY: Changes the parameter value only in the currently running instance,只在内存中修改参数
SPFILE: Changes the parametervalue in the SPFILE only,在SPFILE中修改参数
BOTH: Changes the parameter value in the currently running instance and the SPFILE,这个是默认值,同时在内存中和SPFILE中修改
SID: Identifies the ORACLE_SID for the SPFILE being used
‘sid’: Specific SID to be used in altering the SPFILE,也就是自己database的SID
‘*’: Uses the default SPFILE,使用默认值,就是适用于每个数据库的意思
还有一个deferred参数,下次生效。
下面是官方联机文档的图片
这个就不给上机的图示了
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