LGWR SYNC配置最大性能dataguard（不需要在备库创建standby redo log）
主库确保强制归档
alter database archivelog;
alter database force logging;
select name,log_mode,force_logging from v$database
1:主库创建主备的pfile
create pfile='XX.主’ from spfile;
create pfile='XX.备’ from spfile;
主pfile配置增加下面五项，缺一不可（DG_CONFIG谁在逗号前面，谁在逗号后面不影响，DG_CONFIG值是db_unique_name，service值是tns别名）
*.db_unique_name='master'
*.log_archive_config='DG_CONFIG=(master,slave)'
*.log_archive_dest_1='location=/orasoft/ora11g/archivelog'
*.log_archive_dest_2='service=testdg lgwr sync affirm VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)db_unique_name=slave'
*.remote_login_passwordfile='EXCLUSIVE'
备pfile配置增加下面七项，缺一不可（DG_CONFIG谁在逗号前面，谁在逗号后面不影响，DG_CONFIG值是db_unique_name，service值是tns别名，fal_client和fal_server值是tns别名）
*.db_unique_name='slave'
*.log_archive_config='DG_CONFIG=(master,slave)'
*.log_archive_dest_1='location=/orasoft/ora11g/archivelog'
*.remote_login_passwordfile='EXCLUSIVE'
*.fal_client='testdg'
*.fal_server='testdb'
*.STANDBY_FILE_MANAGEMENT='AUTO' //缺少这个参数的话，主库新建data_file后备库会报错ORA-01274
2:主库在mount状态下创建备库的crontrol
alter database create standby controlfile as ‘XX’
3:关闭主库，把主库数据文件、密码文件，备库crontrol拷贝到备库（不用从主库拷贝online redo log，因为备库启动的时候会自动创建online redo log）
4:主库pfile启动
5:备库pfile启动到nomount状态，再依次执行下面三条语句
alter database mount standby database;
alter database open read only;
alter database recover managed standby database disconnect from session;
6:备库执行create spfile from pfile //备库虽然是read only，但是也可以创建
在上面的基础上升级到最大可用模式
1：主库执行alter database set standby database to maximize availability; //之后备库应用完归档日志后也自动变成maximize availability，主库宕机后备库还是maximize availability状态
2：主库执行shutdown immediate并startup
3：备库执行alter database recover managed standby database cancel;
4：备库创建standby redo log
先在主库查询有多少组redo log，有N组redo log就建立N+1组standby log，redo log多大，standby log也建立多大
alter database add standby logfile group 4 '/orasoft/ora11g/log/standby_redo04.log' size 50M,group 5 '/orasoft/ora11g/log/standby_redo05.log' size 50M,group 6 '/orasoft/ora11g/log/standby_redo06.log' size 50M,group 7 '/orasoft/ora11g/log/standby_redo07.log' size 50M;
5：备库执行alter database recover managed standby database disconnect from session;（再应用主库重启时产生的归档日志，主库那刻产生的归档日志可能因为主库重启或备库执行alter database recover managed standby database cancel没有应用到）
6：备库执行alter database recover managed standby database cancel;
7：备库执行alter database recover managed standby database using current logfile disconnect from session;