On 10/16/2015 12:10 PM, anj patnaik wrote:
Thanks. what is the recommended command/options for backup and how to restore? I found the below online. let me know if this is better and how to restore. Thank you pg_dump -Fc '<Db-Name>' | xz -3 dump.xz
Again, why would compress an already compressed output? Also online: http://www.postgresql.org/docs/9.4/interactive/app-pgdump.html http://www.postgresql.org/docs/9.4/interactive/app-pgrestore.html They step you through the backup and restore process.
On Fri, Oct 16, 2015 at 4:05 AM, Francisco Olarte <folarte@xxxxxxxxxxxxxx <mailto:folarte@xxxxxxxxxxxxxx>> wrote: On Fri, Oct 16, 2015 at 8:27 AM, Guillaume Lelarge <guillaume@xxxxxxxxxxxx <mailto:guillaume@xxxxxxxxxxxx>> wrote: > 2015-10-15 23:05 GMT+02:00 Adrian Klaver <adrian.klaver@xxxxxxxxxxx <mailto:adrian.klaver@xxxxxxxxxxx>>: >> On 10/15/2015 01:35 PM, anj patnaik wrote: ... >>> ./pg_dump -t RECORDER -Fc postgres | gzip > /tmp/dump >>> Are there any other options for large tables to run faster and occupy >>> less disk space? >> Yes, do not double compress. -Fc already compresses the file. > Right. But I'd say "use custom format but do not compress with pg_dump". Use > the -Z0 option to disable compression, and use an external multi-threaded > tool such as pigz or pbzip2 to get faster and better compression. Actually I would not recommend that, unless you are making a long term or offsite copy. Doing it means you need to decompress the dump before restoring or even testing it ( via i.e., pg_restore > /dev/null ). And if you are pressed on disk space you may corner yourself using that on a situation where you do NOT have enough disk space for an uncompressed dump. Given you normally are nervous enough when restoring, for normal operations I think built in compression is better. Also, I'm not current with the compressor Fc uses, I think it still is gzip, which is not that bad and is normally quite fast ( In fact I do not use that 'pbzip2', but I did some tests about a year ago and I found bzip2 was beaten by xz quite easily ( That means on every level of bzip2 one of the levels of xz beat it in BOTH size & time, that was for my data, YMMV ). Francisco Olarte.
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