Questions of newbie on RMAN

Hi, I'm kinda a newbie to RMAN and I want to change on my existing backup strategy to use this. Before I had taken a cold backup to tape every night.

Q. I now intend to use RMAN to backup online all night at the FRA and then once a day unloading FRA tape - is this a typical strategy of RMAN?

Q. a backupset consists of 4 parts. Archives of newspapers, control file, archive during backup logs and files database, SPFILE. What is the first set of archive logs? for example, these necessary logs to recover since the last backup to the current point in time? I'm not sure if you take a backup then what you need to roll forward bare?

Q. is the last piece of the backup of the archives set connects always contain a minimum of 1 that is backup RMAN itself actually causes a switch of implicit journal?

Q. don't each backup includes the control file and the SPFILE (or find you only it is you have AutoSave enabled?)

Q. If I want to be able to restore 2 days ago, it's better if use, a redundancy of 2 or in a detention policy window 2 day recovery? I think that if for some reason, I had more than 1 backup for a given day, I would not be guaranteed to be able to restore 2 days ago? (I know flashback Database is another alternative, but at the mpoment I focus on rethinking my RMAN ability)


Q. If my control_file_record_keep_time is 7 days and I want to restore my database for say more than 7 days ago I have to preload a backup tape in my FRA of the 7 days ago or more and then do a cross check to the RMAN backup?

I took 3 backups (2 sets of backup and copy of 1 image)

Q. the list only list backup of backup sets? Do you need to use the copy of the list to see the image copy backup?

Q. I find reading is not particularly nice backup list! It's not really structure / nest the output as defined backup and parts under this set (it just seems to show all effectively as part of backup set). Is there any alternative output say v $ backup_set which is more useful? In particular, I'm trying to watch a backup set intuitively and easily see which parts belong to him. Using the execution under the list of backup time is a method, but this can be confusing if you take a daily backup, and the backup takes place during the period of midnight! List backup doest seem to display time stamp, only the date stamp

Q. when I do the copy of the Image, a directory of DATA file is created in my FRA and contains a copy of the data files. But where is a copy of the Archive of newspapers preserved? I see an ARCHIVELOG under FRA directory, but this is where the archive logs are preserved. A copy of the picture made it not actually a copy of these or is it just to use the same directory as LOG_ARCHIVE_DEST_1?

Many questions here!

Thanks for any help

Jim

We need to send you a book to answer your questions!

Q. I now intend to use RMAN to backup online all night at the FRA and then once a day unloading FRA tape - is this a typical strategy of RMAN?

I can't say what is a 'typical' strategy unless I have seen implementations of RMAN at least 50 different stations however, some sites to make backups on live band, some sites do backups disk and then use the methods RMAN or non-RMAN to copy from disk to tape.

Q. a backupset consists of 4 parts. The newspaper archives, file database files, SPFILE & control, archiving during the backup logs. What is the first set of archive logs? for example, these necessary logs to recover since the last backup to the current point in time? I'm not sure if you take a backup then what you need to roll forward bare?

Not necessarily 4.  Could be more, could be less - depends what backup commands you run and data files, how many there are in the database.  The first 'series' is archivelogs * ONLY IF * you run a BACKUP of DATA PLUS ARCHIVELOG command.  Otherwise, if you run the BACKUP DATABASE and BACKUP ARCHIVELOG orders, you would separate sets of backup.  (Most sites run ARCHIVELOG BACKUP separately and more frequently than DATABASE BACKUP).    You need ArchiveLogs in all cases restore + restore other then the case where you are restoring a backup cold and don't not updating.

Q. is the last piece of the backup of the archives set connects always contain a minimum of 1 that is backup RMAN itself actually causes a switch of implicit journal?

It is based on the commands that you use.

Q. don't each backup includes the control file and the SPFILE (or find you only it is you have AutoSave enabled?)

Only if you CONFIGURE CONTROLFILE AUTOBACKUP ON.  You should also be careful and where will these record - if you use an MRE and do not replace it with a clause FORMAT, they go to the FRA.  Otherwise, they go to the location of FORMAT.  Or go in $ORACLE_HOME/dbs

Q. If I want to be able to restore 2 days ago, it's better if use, a redundancy of 2 or in a detention policy window 2 day recovery? I think that if for some reason, I had more than 1 backup for a given day, I would not be guaranteed to be able to restore 2 days ago?

You must configure a recovery window.  Your suspicion is correct.  Two backups in one day meet 2 dismissal policy, thus making OBSOLETE backup from the night before.

Q. If my control_file_record_keep_time is 7 days and I want to restore my database for say more than 7 days ago I have to preload a backup tape in my FRA of the 7 days ago or more and then do a cross check to the RMAN backup?

Even with a control_file_record_keep_time of 7 days, the control file can contain information more than 7 days (for example, if you had 700 archivelogs in 7 days and expanded control file to contain 700 entries in the past, but now you have only 10 archivelogs per day, it may contain entries for 70 days of the archivelogs).

You need to do a CATALOG (not OVERLAP) entered catalog for the files not present in the controlfile.

A stratgey alternative is to use a catalog schema (database of repository) and do not rely on the single control file.

Q. the list only list backup of backup sets? Do you need to use the copy of the list to see the image copy backup?

Yes.

Q. I find reading is not particularly nice backup list!

You will have to live with it.  Individually, you can wish LIST BACKUP OF THE DATA file for each data file or LIST SUMMARY of BACKUP.

A copy of the picture made it not actually a copy of these or is it just to use the same directory as LOG_ARCHIVE_DEST_1?

Copy of the image applies only to data files (there is also a CONTROLFILECOPY) not archivelogs.   ARCHIVELOG backups RMAN are BackupSets.

Hemant K Collette

Tags: Database

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