Re: Order by and timestamp

> 16 mars 2020 kl. 16:27 skrev Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com>:
>
> On 3/16/20 1:51 AM, Björn Lundin wrote:
>>> 16 mars 2020 kl. 01:41 skrev Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us <mailto:tgl(at)sss(dot)pgh(dot)pa(dot)us>>:
>>>
>>> Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com <mailto:adrian(dot)klaver(at)aklaver(dot)com>> writes:
>>>> On 3/15/20 2:33 PM, Björn Lundin wrote:
>>>>> I then did ’select * from AMARKETS order by STARTTS’
>>>
>>>> Is amarkets in more then one schema?
>>>
>>> Yeah, it's hard to think of any explanation other than "the query used a
>>> corrupt index on startts to produce the ordering". But your \d doesn't
>>> show any index on startts. So maybe there's more than one amarkets
>>> table?
>> Yes - in other schemas - described in reply to Adrain
>> But the schema_path does not point to them
>> And those two other tables are empty
>>> Another possibly-useful bit of evidence is to see what EXPLAIN shows as
>>> the query plan for this query.
>> bnl=> explain select * from amarkets order by startts;
>
> Can you run as:
>
> explain analyze select * from amarkets order by startts;

Yes, below the first plan

>
>> QUERY PLAN
>> -----------------------------------------------------------------------
>> Sort (cost=10702.57..10939.29 rows=94691 width=106)
>> Sort Key: startts
>> -> Seq Scan on amarkets (cost=0.00..2875.91 rows=94691 width=106)
>> (3 rader)
>> —

bnl=> explain analyze select * from amarkets order by startts;
QUERY PLAN
-----------------------------------------------------------------------------------------------------------------------
Sort (cost=10702.57..10939.29 rows=94691 width=106) (actual time=404.555..422.174 rows=97835 loops=1)
Sort Key: startts
Sort Method: quicksort Memory: 24329kB
-> Seq Scan on amarkets (cost=0.00..2875.91 rows=94691 width=106) (actual time=4.586..351.739 rows=97835 loops=1)
Planning time: 74.707 ms
Execution time: 434.785 ms
(6 rader)

Tid: 527,142 ms
bnl=>

--
Björn Lundin
b(dot)f(dot)lundin(at)gmail(dot)com