Re: [HACKERS] Queuing all tables for analyze after recovery

On 10/19/2017 11:26 PM, Tom Lane wrote:
> Vik Fearing <vik.fearing@2ndquadrant.com> writes:
>> On 10/19/2017 10:54 PM, Tom Lane wrote:
>>> Uh ... recommended by whom?  pg_statistic has exactly the same reliability
>>> guarantees as the rest of the system catalogs.
> 
>> For data statistics, sure.  One thing I'm unhappy about is that
>> pg_stat_all_tables is blank.
> 
> Well, that's because we throw away the stats collector's stats after a
> crash -- or, in the failover case, because the promoted slave has its own
> counters and not the master's.  ANALYZE isn't going to help that at all.

Sure it will.  ANALYZE estimates n_dead_tup, which often accurate enough
for autovacuum to figure out what to do.
-- 
Vik Fearing                                          +33 6 46 75 15 36
http://2ndQuadrant.fr     PostgreSQL : Expertise, Formation et Support


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