Ok . thanks .. this is our first foray into postgresql and we were comparing retrieve times based on the 'normal'
MicrosoftSQL environment to ensure that we were at least functioning properly.
Long term, our goal is to restructure that table into a star-schema/mdm type format to ease the maintenance.
In your opinion, would we see the benefit of moving to a postgresql environment by restructuring the 80 column table
intoa star-schema?
Joanne
-----Original Message-----
From: Melvin Davidson [mailto:melvin6925@gmail.com]
Sent: Tuesday, November 10, 2015 11:16 AM
To: Jim Nasby
Cc: Mammarelli, Joanne T; pgsql-general@postgresql.org
Subject: Re: [GENERAL] Slow response if pulling through pgadmin
I would also like to add that I am very suspicious of a table with 80 columns.
Offhand, it sounds like poor database design where someone was trying to put all the eggs in one basket
(figuratively).
Further, what was the exact query?
Queries of the form SELECT * will always be inherently slow with tables that have many columns. Ideally, you only want
toselect just the columns that are needed.
On 11/10/15, Jim Nasby <Jim.Nasby@bluetreble.com> wrote:
> On 11/10/15 9:39 AM, Mammarelli, Joanne T wrote:
>> Hi – same rookie user as before.
>>
>> We have one table
>>
>> 100,000 rows
>>
>> 80 columns
>>
>> When we try to retrieve the data (select * from table) using pgadmin,
>> we get a 193456 ms retrieve time.
>>
>> When I ran a query analyze in the command prompt, we get a 316ms
>> retrieve time.
>
> You mean EXPLAIN ANALYZE?
>
>> .. and finally. When we retrieve the data from the command line, we
>> get a 5720 ms retrieve time.
>
> What was psql doing with the output?
>
> Basically, pgAdmin and psql aren't meant for users to deal with huge
> data sets, because humans don't deal well with huge data sets.
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> Jim Nasby, Data Architect, Blue Treble Consulting, Austin TX Experts
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*Melvin Davidson*
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