Oracle数据库热备份与恢复(联机备份)示例

Oracle数据库热备份(联机备份)示例

必须将日志置为归档方式

SQL>archive log list; --查看日志归档方式.

Database log mode No Archive Mode

Automatic archival Disabled

Archive destination USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence 106

Current log sequence 108

SQL>alter system set log_archive_start=true scope=spfile --启用自动归档

SQL>shutdown immediate

SQL>startup mount --启动数据库，打开控制文件，不打开数据文件

SQL>alter database archivelog --将数据库切换到归档方式

SQL>alter database open; --打开数据库

SQL>archive log list;

Database log mode Archive Mode

Automatic archival Enabled

Archive destination USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence 106

Next log sequence to archive 108

Current log sequence 108

SQL>alter tablespace tt begin backup; --tt表空间备份.

SQL>alter tablespace tt end backup;

SQL>alter system archive log current; --将当前联机日志归档，切换日志.

SQL>alter system switch logfile; --切换第二个日志

SQL>alter system switch logfile; --切换第三个日志

SQL>shutdown immediate;

如果tt.dbf文件损坏.

SQL>startup

ORA-01157:cannot identify/lock data file 6 - see DBWR trace file

ORA-01110:data file 6: 'C:\ORACLE\ORADATA\TEST\TT.DBF'

SQL>SELECT * FROM v$recover_file;

FILE# ONLINE ONLINE_ERROR CHANGE# TIME

---------- ------- ------------------------- ----------- -------------

6 ONLINE ONLINE FILE NOT FOUND 0

SQL>alter database datafile 6 offline drop;

SQL>alter database open;

--将备份文件恢复到原路径

SQL>recover datafile 6;

SQL>alter database datafile 6 online;

SQL>alter database backup controlfile to trace; --备份控制文件 to \udmp\.

SQL>start c:\create_ctl.sql --重新生成控制文件

--日志文件丢失

SQL>recover database until cancel

SQL>alter database open resetlogs