Re: Vacuum full progress

On 5 Sep 2010, at 12:13, Carlos Henrique Reimer wrote:

> Hi,
>
> I need to shrick a table with 102 GB and approximately 380.000.000 rows.

What exactly are you trying to accomplish? You may be saving some space temporarily by running vacuum full and reindex, but the database size will probably grow back to its original size quite quickly once it sees some use (inserts/deletes).

A table that size usually gets partitioned into smaller tables. How to partition your tables depends on how your data is organised and behaves, that's a different discussion. You can find documentation here: http://www.postgresql.org/docs/8.4/interactive/ddl-partitioning.html

> There is a vacuum full running for 13 hours and the only messages a get are:
>
> INFO:  vacuuming "public.posicoes_controles"
> INFO:  "posicoes_controles": found 43960 removable, 394481459 nonremovable row versions in 13308976 pages
> DETAIL:  0 dead row versions cannot be removed yet.
> Nonremovable row versions range from 193 to 217 bytes long.
> There were 136382074 unused item pointers.
> Total free space (including removable row versions) is 27663157952 bytes.
> 2884123 pages are or will become empty, including 0 at the end of the table.
> 4167252 pages containing 27597464344 free bytes are potential move destinations.
> CPU 100.81s/101.45u sec elapsed 3347.95 sec.
> The relfilenode points to the 38611 object and I see that there are 102 38611.n files in the data directory representing this table. From this 102 38611.n files only 53 were updated since the vacuum full process started.
>
> I need to answer these questions:
>
> a) Is there a way to have a general idea if the process is at the end? Is there a way to identify the progess of the work?

Well, you already noticed it's at the 53rd file of 102 files. It's about half-way then I guess.

> b) How much space will be shrank at the time vacuum full finishes?

According to the above up to 27GB (probably less), not counting the index bloat you're generating by running vacuum full.

Alban Hertroys

--
Screwing up is an excellent way to attach something to the ceiling.


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