asterixdb-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Michael Carey <mjca...@ics.uci.edu>
Subject Re: Indexes not performing well
Date Sun, 29 May 2016 05:58:04 GMT
@Pouria: Please share your findings here when you check this out - this 
is quite strange, since none of the other performance results that have 
been obtained on the system have looked anything like this.  (I will try 
to look at this too at some point, but will unfortunately be MIA from 
June 1-15 first.)  Weird....


On 5/26/16 9:20 AM, Pouria Pirzadeh wrote:
> Hi Magnus,
>
> Thanks for your email and sharing the information.
> If it is Ok with you, Would you please share with us the exact DDL 
> (including type definitions, dataset and index definitions) and exact 
> AQL queries that you ran against AsterixDB ?
> I am just interested in checking the query plans and see what ended up 
> being run as jobs.
>
> Thanks.
> Pouria
>
> On Thu, May 26, 2016 at 4:59 AM, Magnus Kongshem 
> <kongshem@online.ntnu.no <mailto:kongshem@online.ntnu.no>> wrote:
>
>     Hi,
>
>     There has been a lot of questions from me regarding AsterixDB and
>     I thank all of you who have answered me. So it is time for me to
>     contribute with some obeservations. I am writing my master thesis
>     where I test multiple databases on a large data set. I should also
>     mention that I have installed AsterixDB on a single machine.
>
>     What I have observed is that asterixDB has a "poorer" read
>     performance when I specify indexes on the data set compared to not
>     implementing any indexes. See the attachment for details, its an
>     excerpt of my thesis explaining and describing the queries, the
>     indexes and the test results. Any thoughts on these test results?
>
>     I also cannot help to notice that the read performance for a query
>     querying a small portion, medium portion and large portion of the
>     data set is very similar. The largest query finds 75 million
>     records and the smallest query finds 3.5 million records, but
>     almost have the same read performance. How can this be?
>
>     Perhaps you can use these test results in the future development
>     of asterixDB.
>
>     I you would like, I can send you my final thesis when it's done.
>
>     -- 
>
>     Mvh
>
>     Magnus Alderslyst Kongshem
>     +47 415 65 906 <tel:%2B47%20415%2065%20906>
>
>


Mime
View raw message