| From: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
|---|---|
| To: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, vinayak <Pokale_Vinayak_q3(at)lab(dot)ntt(dot)co(dot)jp> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, David Steele <david(at)pgmasters(dot)net>, David Fetter <david(at)fetter(dot)org>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: ANALYZE command progress checker |
| Date: | 2017-04-04 05:15:38 |
| Message-ID: | 35d480d4-f889-b0dd-0559-daf06da43d0f@lab.ntt.co.jp |
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| Lists: | pgsql-hackers |
On 2017/04/04 14:12, Amit Langote wrote:
> Two kinds of statistics are collected if the table is a inheritance parent.
>
> First kind considers the table by itself and calculates regular
> single-table statistics using rows sampled from the only available heap
> (by calling do_analyze_rel() with inh=false).
Oops, should have also mentioned that this part is not true for the new
partitioned tables. There are single-table statistics for partitioned
tables, because it contains no data.
Thanks,
Amit
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