March 19, 2017

dd commands

Linux dd commands for Oracle DBAs

dd         -- data(set) definition, useful for taking backup of votedisks/Voting Disks

dd is a command line utility for Unix/Linux operating systems whose primary purpose is to convert files, copy files and to take backup.
dd commands are used - restores/clone a hard disk drive from a previously created image. Clones one partition to another.


  if -- input file
  of -- output file
  bs -- block size

dd if=/u02/ocfs2/vote/VDFile_0 of=$ORACLE_BASE/bkp/VDFile_0

dd if=/dev/hdb2 of=/dev/sda5 bs=8192

dd if=/dev/sda2 of=/dev/sdb2 bs=4096 conv=notrunc,noerror

dd if=/dev/zero of=/abc bs=1 count=1 conv=notrunc,ucase

dd if=/dev/cdrom of=/home/satya/myCD.iso bs=2048 conv=sync,notrunc,lcase

dd if=/dev/hda3 skip=9200 of=/home/satya/backup_set_3.img bs=1M count=4600

dd if=/home/satya/1Gb.file bs=64k | dd of=/dev/null

dd if=testwrite.dbf bs=8192 count=1 skip=1246 of=blk

dd of=testwrite.dbf bs=8192 count=1 seek=3407 if=blk 3407.dmp conv=notrunc

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