Re: REINDEX in tables

Am 25.10.23 um 14:11 schrieb Laurenz Albe:
> On Wed, 2023-10-25 at 11:59 +0200, Andreas Kretschmer wrote:
>> Am 25.10.23 um 11:57 schrieb Matthias Apitz:
>>> El día miércoles, octubre 25, 2023 a las 11:33:11 +0200, Andreas Kretschmer escribió:
>>>> Am 25.10.23 um 11:24 schrieb Matthias Apitz:
>>>>> We have a client who run REINDEX in certain tables of the database of
>>>>> our application (on Linux with PostgreSQL 13.x):
>>>>>
>>>>> REINDEX TABLE CONCURRENTLY d83last;
>>>>> REINDEX TABLE CONCURRENTLY d86plz;
>>>>> REINDEX TABLE CONCURRENTLY ig_memtable;
>>>>> REINDEX TABLE CONCURRENTLY ig_dictionary;
>>>>> REINDEX TABLE CONCURRENTLY ig_dictionary;
>>>>> REINDEX TABLE CONCURRENTLY d50zweig ;
>>>>> REINDEX TABLE CONCURRENTLY d50zweig ;
>>>>>
>>>>> We as the software vendor and support, do not use or recommend this
>>>>> procedure, because we have own SQL files for creating or deleting
>>>>> indices in the around 400 tables.
>>>>>
>>>>> The client is now concerned about the issue that the number of
>>>>> rows in some of the above tables has increased. Is this possible?
>> no, reindex will not add rows to the table.
> But if the indexes were corrupted before the REINDEX, it is possible that
> a query that didn't find a result before the REINDEX can find one afterwards.

Thanks for the addition my friend, that's correct and could be an 
explanation here.


Andreas

-- 
Andreas Kretschmer - currently still (garden leave)
Technical Account Manager (TAM)
www.enterprisedb.com