#  使用alter database backup controlfile to trace;产生控制文件的trace file

-- Below are two sets of SQL statements, each of which creates a new
-- control file and uses it to open the database. The first set opens
-- the database with the NORESETLOGS option and should be used only if
-- the current versions of all online logs are available. The second
-- set opens the database with the RESETLOGS option and should be used
-- if online logs are unavailable.
-- The appropriate set of statements can be copied from the trace into
-- a script file, edited as necessary, and executed when there is a
-- need to re-create the control file.
#  需要重建控制文件的话， 如果online redo 是可用的, 使用NORESETLOGS 创建新控制文件打开数据库
#  如果online redo是不可用的, 那么需要使用RESETLOGS 创建新控制文件打开数据库, 
#  联机日志被重置，数据有可能丢失
--
--     Set #1. NORESETLOGS case
--
-- The following commands will create a new control file and use it
-- to open the database.
-- Data used by Recovery Manager will be lost.
-- Additional logs may be required for media recovery of offline
-- Use this only if the current versions of all online logs are
-- available.
-- After mounting the created controlfile, the following SQL
-- statement will place the database in the appropriate
-- protection mode:
--  ALTER DATABASE SET STANDBY DATABASE TO MAXIMIZE PERFORMANCE
#   下面的命令用来创建一个新的控制文件来开启数据库。 用于RMAN的数据将会丢失。
#   对于offline datafiles 可能需要额外的归档日志用来做介质恢复， 
#   当当前版本的所有online redo log都没有问题的情况下使用noresetlogs。

STARTUP NOMOUNT
CREATE CONTROLFILE REUSE DATABASE "XIENFEI" NORESETLOGS FORCE LOGGING ARCHIVELOG
    MAXLOGFILES 16
    MAXLOGMEMBERS 3
    MAXDATAFILES 100
    MAXINSTANCES 8
    MAXLOGHISTORY 2921
LOGFILE
  GROUP 1 '/u01/oradata/xienfei/redo01.log'  SIZE 5M,
  GROUP 2 '/u01/oradata/xienfei/redo02.log'  SIZE 5M,
  GROUP 3 '/u01/oradata/xienfei/redo03.log'  SIZE 5M
-- STANDBY LOGFILE
DATAFILE
  '/u01/oradata/xienfei/system01.dbf',
  '/u01/oradata/xienfei/undotbs01.dbf',
  '/u01/oradata/xienfei/sysaux01.dbf',
  '/u01/oradata/xienfei/users01.dbf',
  '/u01/oradata/xienfei/example01.dbf',
  '/u01/oradata/xienfei/xff01.dbf',
  '/u01/oradata/xienfei/cf01.dbf',
  '/u01/oradata/xienfei/cfxff01.dbf'
CHARACTER SET ZHS16GBK
;
-- Commands to re-create incarnation table
-- Below log names MUST be changed to existing filenames on
-- disk. Any one log file from each branch can be used to
-- re-create incarnation records.
-- ALTER DATABASE REGISTER LOGFILE '/u01/archive/1_1_756837539.arc';
#  有些时候可能需要先注册归档日志，再才能够恢复
-- Recovery is required if any of the datafiles are restored backups,
-- or if the last shutdown was not normal or immediate.
#  恢复数据库
RECOVER DATABASE
-- All logs need archiving and a log switch is needed.
#  归档所有日志
ALTER SYSTEM ARCHIVE LOG ALL;
-- Database can now be opened normally.
#  打开数据库
ALTER DATABASE OPEN;
-- Commands to add tempfiles to temporary tablespaces.
-- Online tempfiles have complete space information.
-- Other tempfiles may require adjustment.
#  添加临时表空间
ALTER TABLESPACE TEMP ADD TEMPFILE '/u01/oradata/xienfei/temp01.dbf'
     SIZE 32505856  REUSE AUTOEXTEND ON NEXT 655360  MAXSIZE 32767M;
-- End of tempfile additions.

##    下面的RESETLOGS 重建语句， online redo log 中的内容都会丢失，所有的备份将无效 
##    仅仅在online log 损坏的情况下使用 resetlogs 创建控制文件开启数据库。  
##    resetlog创建控制文件后的开启步骤与noresetlog有一些不一样，请注意下面步骤

--     Set #2. RESETLOGS case
--
-- The following commands will create a new control file and use it
-- to open the database.
-- Data used by Recovery Manager will be lost.
-- The contents of online logs will be lost and all backups will
-- be invalidated. Use this only if online logs are damaged.
-- After mounting the created controlfile, the following SQL
-- statement will place the database in the appropriate
-- protection mode:
--  ALTER DATABASE SET STANDBY DATABASE TO MAXIMIZE PERFORMANCE
STARTUP NOMOUNT
CREATE CONTROLFILE REUSE DATABASE "XIENFEI" RESETLOGS FORCE LOGGING ARCHIVELOG
    MAXLOGFILES 16
    MAXLOGMEMBERS 3
    MAXDATAFILES 100
    MAXINSTANCES 8
    MAXLOGHISTORY 2921
LOGFILE
  GROUP 1 '/u01/oradata/xienfei/redo01.log'  SIZE 5M,
  GROUP 2 '/u01/oradata/xienfei/redo02.log'  SIZE 5M,
  GROUP 3 '/u01/oradata/xienfei/redo03.log'  SIZE 5M
-- STANDBY LOGFILE
DATAFILE
  '/u01/oradata/xienfei/system01.dbf',
  '/u01/oradata/xienfei/undotbs01.dbf',
  '/u01/oradata/xienfei/sysaux01.dbf',
  '/u01/oradata/xienfei/users01.dbf',
  '/u01/oradata/xienfei/example01.dbf',
  '/u01/oradata/xienfei/xff01.dbf',
  '/u01/oradata/xienfei/cf01.dbf',
  '/u01/oradata/xienfei/cfxff01.dbf'
CHARACTER SET ZHS16GBK
;
-- Commands to re-create incarnation table
-- Below log names MUST be changed to existing filenames on
-- disk. Any one log file from each branch can be used to
-- re-create incarnation records.
#  注册归档日志
-- ALTER DATABASE REGISTER LOGFILE '/u01/archive/1_1_756837539.arc';
-- Recovery is required if any of the datafiles are restored backups,
-- or if the last shutdown was not normal or immediate.
#  使用历史控制文件恢复数据库（因为redo log是新建，所以对于redo 而言，控制文件是新建的）
RECOVER DATABASE USING BACKUP CONTROLFILE
-- Database can now be opened zeroing the online logs.
#  使用RESETLOGS方式打开数据库
ALTER DATABASE OPEN RESETLOGS;
-- Commands to add tempfiles to temporary tablespaces.
-- Online tempfiles have complete space information.
-- Other tempfiles may require adjustment.
#  添加临时表空间
ALTER TABLESPACE TEMP ADD TEMPFILE '/u01/oradata/xienfei/temp01.dbf'
     SIZE 32505856  REUSE AUTOEXTEND ON NEXT 655360  MAXSIZE 32767M;
-- End of tempfile additions.