Re: gzip vs. compress
- From: rjsearle@xxxxxxxxx
- To: aregularjoe8@xxxxxxxxx
- Date: Wed, 23 Jan 2008 08:58:39 +1000
I try to use gzip exclusively. as you can tune the tradeoff between
compression effort and compressed size. For real quick compression (not so
small) use "gzip -1 <file>" For best compression, (slower and smaller) use
"gzip -9 <file>" It's all in the gzip man page.
hth
Russell
On 1/23/08, Joe Cooper <aregularjoe8@xxxxxxxxx> wrote:
>
> I don't currently have an AIX box to test, but I do have Solaris 10
> running, and can show:
>
> /export/home/oracle/joework> ls -l atg-smowner.dmp
> -rw-r----- 1 oracle dba 193003520 Sep 12 16:32 atg-smowner.dmp
> /export/home/oracle/joework> compress atg-smowner.dmp
> /export/home/oracle/joework> ls -l atg-smowner.dmp*
> -rw-r----- 1 oracle dba 89629298 Sep 12 16:32 atg-smowner.dmp.Z
> /export/home/oracle/joework> uncompress atg-smowner.dmp.Z
> /export/home/oracle/joework> ls -l atg-smowner.dmp*
> -rw-r----- 1 oracle dba 193003520 Sep 12 16:32 atg-smowner.dmp
> /export/home/oracle/joework> gzip atg-smowner.dmp
> /export/home/oracle/joework> ls -l atg-smowner.dmp*
> -rw-r----- 1 oracle dba 70873960 Sep 12 16:32 atg-smowner.dmp.gz
>
> A 193MB file compresses to ~90MB, and gzips to ~71MB. Almost no
> difference in processing time (though I didn't document that in this
> quick-n-dirty demo). I've experienced the same results (gzip output roughly
> 30% smaller than compress) on many UNIX boxes at many places over many
> years.
>
> But, then again, "your mileage may vary"
>
> Joe Cooper
> Senior Oracle DBA
> Department of Veterans Affairs
> Austin, TX
>
> *Joe Smith <joe_dba@xxxxxxxxxxx>* wrote:
>
> Which is better to use gzip or compress?
>
> All of my work is done on AIX 5L 64bit server.
>
> I am doing cold backups of databases where I tar and then compress the
> resulting file.
>
> I have always used compress, but I read that gzip gives better
> compression.
>
> Any thoughts will be appreciated.
>
>
>
>
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