Re: Reindex doesn't eliminate bloat

On 03/12/2018 05:55 PM, Adrian Klaver wrote:
> On 03/12/2018 03:05 PM, Ron Johnson wrote:
>> v8.4.12
>>
>> According to this (https://pastebin.com/TJB32n5M) query, which I thought 
>> I got from https://wiki.postgresql.org/wiki/Index_Maintenance, a list of 
>> indexes and their bloat is generated.
>>
>> After reindexing a table with a large amount of reported bloat (column 
>> bloat_pct says 29%), re-running the query shows no change in the amount 
>
> First I am not seeing a column bloat_pct in the query you linked to, so 
> are you sure that is the actual query you used?

Sorry.  bloat_pct is renamed bloat_ratio.

>
>> of bloat.  This is a historical table, and VACUUM VERBOSE shows that 
>> there's nothing to free up.
>>
>> Is this something that I must live with, or am I misinterpreting the query?
>
> Honestly I have not worked my way in depth through the query you show, 
> though I did notice it uses pg_stats. What happens if run ANALYZE 
> (https://www.postgresql.org/docs/8.4/static/sql-analyze.html) to update 
> the stats?


I did ANALYZE VERBOSE on the underlying table.  No change.


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