Oracle DUL and ASM

amdu

Always good to know that starting from 11g amdu is included in the distribution. Amdu is the asm dump utility. Apart

from dumping asm metadata it also has an -extract option to extract a file from an asm disk group. It is a standalone

utility, if needed you can even use it with 10g.

amdu help=yes prints information on how to use it.

asm 11g

Asm 11g uses variable extents, this is not supported in the 10.2 version of DUL. Ask for for a beta version if you

encounter this.

control.dul for asm

DUL needs to know where the asm disks are. DUL does not do automatic discovery the disks. This is the file I use

for testing:

disk /11gr2/oradata/dsk0

disk /11gr2/oradata/dsk1

disk /11gr2/oradata/dsk2

disk /11gr2/oradata/dsk3

disk /11gr2/oradata/dsk4

disk /11gr2/oradata/dsk5

+DG11G/TST/DATAFILE/SYSTEM.260.740158099

+DG11G/TST/DATAFILE/SYSAUX.261.740158145

+DG11G/TST/DATAFILE/UNDOTBS1.262.740158177

+DG11G/TST/DATAFILE/USERS.264.740158249

+DG11G/TST/TEMPFILE/TEMP.263.740158181

/11gr2/rdbms/dbs/bigfilets

/11gr2/rdbms/dbs/assm.dbf

First list all the asm disk, DUL will find out the diskgroups etc from header inspection, if you did not configure any

datafiles in a diskgroup, DUL tries to list the files it finds, otherwise its silent.

The essential bit of a file name is the diskgroupname and the file number, the combination is used to identify the

datafile in the diskgroup.

to be continued.