Home Database Mysql Tutorial RAC 环境下参数文件(spfile)管理

RAC 环境下参数文件(spfile)管理

Jun 07, 2016 pm 05:24 PM

RAC环境下,初始化参数文件与但实例下参数文件有些异同,主要表现在初始化参数可以为多个实例公用,也可以单独设置各个实例的初始

RAC环境下,初始化参数文件与但实例下参数文件有些异同,主要表现在初始化参数可以为多个实例公用,也可以单独设置各个实例的初始化参数。对于那些非共用的初始化参数则必须要单独设置,而共用的则可以单独设置,但一般不建议这么用。本文描述RAC 环境下参数文件(spfile)的相关管理工作。

有关RAC环境下的重要参数描述,请参考:RAC 环境下重要参数

1、参数文件的位置 
 
  SQL> show parameter instance_name 
   
  NAME                                TYPE        VALUE 
  ------------------------------------ ----------- ------------------------------ 
  instance_name                        string      ora10g1 
  SQL> show parameter spfile; 
   
  NAME                                TYPE        VALUE 
  ------------------------------------ ----------- ------------------------------ 
  spfile                              string      +DG1/ora10g/spfileora10g.ora 
   
  SQL> show parameter instance_name 
   
  NAME                                TYPE        VALUE 
  ------------------------------------ ----------- ------------------------------ 
  instance_name                        string      ora10g2 
  SQL> show parameter spfile 
   
  NAME                                TYPE        VALUE 
  ------------------------------------ ----------- ------------------------------ 
  spfile                              string      +DG1/ora10g/spfileora10g.ora 
   
  SQL> show parameter cluster 
   
  NAME                                TYPE        VALUE 
  ------------------------------------ ----------- ------------------------------ 
  cluster_database                    boolean    TRUE 
  cluster_database_instances          integer    2 
   
   
  Oracle@bo2dbp:~> cd /u01/oracle/admin/ora10g 
  oracle@bo2dbp:/u01/oracle/admin/ora10g> ls 
  adump  bdump  cdump  dpdump  hdump  pfile  udump 
  oracle@bo2dbp:/u01/oracle/admin/ora10g> cd pfile 
  oracle@bo2dbp:/u01/oracle/admin/ora10g/pfile> ls -hltr 
  total 4.0K 
  -rw-r----- 1 oracle oinstall 2.7K 2012-09-27 12:12 init.ora.8272012121245 
  oracle@bo2dbp:/u01/oracle/admin/ora10g/pfile> cd $ORACLE_HOME/dbs 
  oracle@bo2dbp:/u01/oracle/db/dbs> ls *.ora 
  init+ASM1.ora  initdw.ora  initGOBO1A_tmp.ora  initGOBO4A.ora  init.ora  initora10g1.ora 
  oracle@bo2dbp:/u01/oracle/db/dbs> more initora10g1.ora 
  SPFILE='+DG1/ora10g/spfileora10g.ora' 
  oracle@bo2dbs:/u01/oracle/db/dbs> more initora10g2.ora 
  SPFILE='+DG1/ora10g/spfileora10g.ora' 
   
  #由上面的查询可知RAC环境下的参数文件通常都存放在RAW或者ASM中,缺省路径为$ORACLE_HOME/dbs/init{ORACLE_SID}.ora 
  #各个实例只是存放pfile文件,pfile文件的内容是指向spfile文件的位置,即告诉,兄弟,你去xx去找那个spfile吧,哈哈,,, 
  #注,,Oracle数据库启动时会先找spfile${ORACLE_SID.ora},如果对应的spfile不存在则找spfile.ora 
  #如果spfile.ora找不到,则找相应的pfile(init{ORACLE_SID}.ora) 
  #那,要是都找不到呢,那就是用缺省的init.ora尝试启动实例   

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