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doc: add example of using pg_dump with GNU split and gzip 

This is only possible with GNU split, not other versions like BSD split.

Reported-by: jim@jdoherty.net

Discussion: https://postgr.es/m/162653459215.701.6323855956817776386@wrigleys.postgresql.org

Backpatch-through: 9.6
This commit is contained in:
Bruce Momjian 2021-08-03 10:57:32 -04:00
parent 5cf350ce02
commit 78aa655d77
1 changed files with 11 additions and 2 deletions
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13
doc/src/sgml/backup.sgml
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@ -273,10 +273,10 @@ cat <replaceable class="parameter">filename</replaceable>.gz | gunzip | psql <re
The <command>split</command> command
allows you to split the output into smaller files that are
acceptable in size to the underlying file system. For example, to
make chunks of 1 megabyte:
make 2 gigabyte chunks:
<programlisting>
pg_dump <replaceable class="parameter">dbname</replaceable> | split -b 1m - <replaceable class="parameter">filename</replaceable>
pg_dump <replaceable class="parameter">dbname</replaceable> | split -b 2G - <replaceable class="parameter">filename</replaceable>
</programlisting>
Reload with:
@ -284,6 +284,15 @@ pg_dump <replaceable class="parameter">dbname</replaceable> | split -b 1m - <rep
<programlisting>
cat <replaceable class="parameter">filename</replaceable>* | psql <replaceable class="parameter">dbname</replaceable>
</programlisting>
If using GNU <application>split</application>, it is possible to
use it and <application>gzip</application> together:
<programlisting>
pg_dump <replaceable class="parameter">dbname</replaceable> | split -b 2G --filter='gzip > $FILE.gz'
</programlisting>
It can be restored using <command>zcat</command>.
</para>
</formalpara>