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当使用spfile时,不用重启就能生效的初始化参数,可以通过v$parameter.ISSYS_MODIFIABLE字段来判断。v$parameter.ISSYS_MODIFIABLE参数Indicates whether the parameter can be changed with ALTER SYSTEM and when the change takes effect:IMMEDIATE - Parameter can be changed with ALTER SYSTEM regardless of the type of parameter file used to start the instance. The change takes effect immediately.DEFERRED - Parameter can be changed with ALTER SYSTEM regardless of the type of parameter file used to start the instance. The change takes effect in subsequent sessions.FALSE - Parameter cannot be changed with ALTER SYSTEM unless a server parameter file was used to start the instance. The change takes effect in subsequent instances.
  1. SQL>  select distinct issys_modifiable from v$parameter;  
  2.    
  3. ISSYS_MODIFIABLE  
  4. ----------------   
  5. IMMEDIATE  
  6. FALSE  
  7. DEFERRED  
  8.   
  9. SQL>  select  name,issys_modifiable from v$parameter where name="sga_target";  
  10.    
  11. NAME                                                                             ISSYS_MODIFIABLE  
  12. -------------------------------------------------------------------------------- ----------------   
  13. sga_target                                                                       IMMEDIATE  
  14. SQL>  select  name,issys_modifiable from v$parameter where name="remote_login_passwordfile";  
  15.    
  16. NAME                                                                             ISSYS_MODIFIABLE  
  17. -------------------------------------------------------------------------------- ----------------   
  18. remote_login_passwordfile                                                        FALSE  
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