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The asmcmd utility implements commands such as cp, which helps you copy files from ASM to the operating system file system and vice versa. The two most important asmcmd commands that you must know about are the md_backup and the md_restore commands, which together form what Oracle calls ASM Backup and Recovery (AMBR). Using the md_backup and the md_restore options of the asmcmd utility, you can re-create ASM disk groups with identical alias directory structures and templates. The ASM backup functionality gathers disk group and failure configuration details and information about templates and alias directory structures. The md_backup command stores this backup-related metadata in a text file. The md_restore option uses the information in the text file to reconstruct disk groups. I discuss the md_backup and the md_restore commands in more detail in the following sections.

An indirect-delivery system decouples event senders from receivers by interposing one or more middleware components. Indirect delivery is particularly common in enterprise systems, in which

You can make backups of the ASM metadata for a disk group with the help of the md_backup command. These backups help ASM easily re-create ASM disk groups following the loss of a disk group. Here s the syntax of the md_backup command: md_backup [-b <backup_file>] [-g '<diskgroup_name>,<diskgroup_name>, . . .'] The b option specifies a name for the backup text file, which is named ambr_backup_ intermediate by default. By default, the md_backup command backs up all ASM disk groups, but you can specify the disk groups you want by using the g option. Here s an example showing how to back up a single disk group by executing this command: ASMCMD> md_backup -b /tmp/asmbkp1 -g admdsk1 The g option specifies that a single disk group be backed up, and the b option specifies the file asmbkp1 as the backup text file.

Before you can execute the md_restore command to restore the ASM metadata for a disk group, you must first restore the disk group. Once you do that, you can run the md_restore command, the syntax of which is shown here: md_restore -b <backup_file> [-li] [-t (full)|nodg|newdg] [-f <sql_script_file>] [-g '<diskgroup_name>,<diskgroup_name>, . . .'] [-o '<old_diskgroup_name>:<new_diskgroup_name>, . . .'] Of the various options you can specify with the md_restore command, the -t option bears some explanation. You can specify the backup type using this option, as explained here: full creates the disk group and restores the metadata. nodg restores the metadata only. newdg creates the disk group with a different name and restores the metadata. The following example shows how to restore a disk group and create a new disk group by specifying -t newdg: ASMCMD> md_restore -t newdg -o 'DGNAME=asmdsk1:asmdsk2' -i backup_file The md_recover command can t restore the actual data stored on the ASM disks. However, it restores the disk groups, modifies templates, and creates the directories. Once you restore the disk group metadata, you can use the RMAN backups to restore the data in the re-created disk groups.

In the following example, I show how to use the md_backup and md_restore commands to restore lost data:

the senders and receivers are on different machines. There are many technologies and products to choose from. The following sections discuss the ones that seem to be in greatest favor today.

1. Back up the users tablespace: RMAN> BACKUP TABLESPACE users; 2. Create a directory named test in the disk group DGROUPA. Also create an alias called +DGROUPA/test/users.f that points to the ASM datafile that contains the users tablespace: ASMCMD> mkdir +DGROUPA/test ASMCMD> mkalias TBSSRA.123.123456789 +DGROUPA/test/users.f

3. Back up the metadata for the disk group DGROUPA using the md_backup command: ASMCMD> md_backup g dgroupA The md_backup command stores the backup metadata in the text file named ambr_backup_ intermediate in the current directory. 4. Simulate a disk failure by dropping the disk group DGROUPA: SQL> ALTER DISKGROUP dgroup1 DISMOUNT FORCE; SQL> DROP DIKSGROUP dgroup1 FORCE INCLUDING CONTENTS; The DISMOUNT FORCE clause in the ALTER DISKGROUP command dismounts the disk group and force drops it. 5. Execute the md_restore command to restore the ASM metadata for the dropped disk group: ASMCMD> md_restore b ambr_backup_intermediate_file t full g data 6. Using the backup of the users tablespace from step 1, restore the users tablespace: RMAN>RESTORE TABLESAPCE users; 7. Exit from RMAN once the restore is completed.