On Tue, 24 Dec 2019 at 02:41, Peter Geoghegan <p...@bowt.ie> wrote:
>
> On Mon, Dec 23, 2019 at 11:05 AM Mahendra Singh <mahi6...@gmail.com> wrote:
> > From above example, we can see that after deleting all the tuples from 
> > table and firing vacuum command, size of table is reduced but size of index 
> > relation is same as before vacuum.
>
> VACUUM is only able to make existing empty pages in indexes recyclable
> by future page splits within the same index. It is not possible for it
> to reclaim space for the filesystem. Workload characteristics tend to
> determine whether or not this limitation is truly important.

Thank you for the clarification.

Thanks and Regards
Mahendra Singh Thalor
EnterpriseDB: http://www.enterprisedb.com


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