tailieunhanh - o reilly Unix Backup and Recovery phần 7

Phương pháp thương mại thứ hai của sao lưu Oracle là sử dụng EBU Oracle7 hoặc RMAN Oracle8. EBU / RMAN là các sản phẩm Oracle nội bộ được thiết kế để cung cấp cho một tiện ích sao lưu một dòng (hoặc nhiều suối) sao lưu dữ liệu từ cơ sở dữ liệu. | The second commercial method of backing up Oracle is to use Oracle7 s EBU or Oracle8 s rman. EBU rman are Oracle internal products that are designed to give a backup utility a stream or many streams of backup data from the database. The command that is run is called obackup or rman. After a onetime setup the commercial backup software can communicate with Oracle at any time to initiate a backup. It tells Oracle that it wants to back up instance ORACLE_SID and it is able to receive n threads of data. See Commercial Backup Utilities in Chapter 5 for an explanation of how backup threads work. EBU rman then does all the internal communication that it needs to do to supply the backup utility with n threads of data. Both the utility and EBU rman record the time of the backup for future reference. After things have been set up it is also possible for a DBA to run the obackup or rman command from the command line. This command then calls the appropriate programs to connect with the backup utility. The commercial backup utility then responds to this as to any other backup request loading volumes as necessary. Page 477 Since EBU is no longer supported in Oracle8 we do not cover it here. Recovery Manager is supported in Oracle8 and has a number of advantages over EBU. One of the main advantages is that it understands the structure of the database a lot better. It can be told for example to restore a tablespace. It knows what files are in that tablespace and then restores the most recent backup of those files. Once that is accomplished it then can be told to recover that tablespace or apply media recovery to it. This is far better than having to find out what files to restore. rman is too complex to be covered in detail in a chapter of this size consult Oracle s Backup and Recovery Guide for an explanation of how rman works. What I would like to include in this chapter however is what is not included in the documentation-how to use rman to completely automate the process of .