On 06/10/2016 10:20 AM, David G. Johnston wrote:
> Can you be more precise? A single table can only be placed onto one
> file system.
>
> Only if those different file systems have different physical
> characteristics is using a tablespace likely to be a good solution. In
> other scenarios having some kind of virtual file system overlay at the
> O/S level and exposed to PostgreSQL is probably a better option.
The advantage of table spaces are:
1. You can have indexes and tables on different filesystems
2. You can use different storage for different data:
1. SSDs for your highly active
2. SAS for your reasonably accessed
3. SATA for your high volume archives
3. You can readily add capacity to your database by adding storage and
then moving data to a new tablespace upon that storage
The downside to tablespaces are:
1. Restoration can be a pain (especially for base backups)
Sincerely,
JD
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