users-list December 2015

users-list@monetdb.org

22 participants
12 discussions

by Vijay Krishna

How to find all running processes and their statuses in MonetDB?? I found this... https://www.monetdb.org/Documentation/Cookbooks/SQLrecipes/monitor But I couldn't get this work... I ran a query (which took some 20 seconds to complete) in a window and connected the same database in another terminal and ran "select * from sys.queue" (several times during those 20 seconds) but I could get only this... sql>select * from sys.queue; +-------+---------+----------------------------+----------------------------+----------+---------+------------+--------------------------+ | qtag | user | started | estimate | progress | status | tag | query | +=======+=========+============================+============================+==========+=========+============+==========================+ | 27339 | monetdb | 2015-08-13 05:35:40.000000 | null | null | running | 12532134@0 | select * from sys.queue; | +-------+---------+----------------------------+----------------------------+----------+---------+------------+--------------------------+ I am using Oct-2014 version of monetdb on CentOS... Is there a way to find all running processes and their statuses in MonetDB?? Thanks & Regards, Vijayakrishna.P. Mobile : (+91) 9500402305.

6 years, 3 months

About database crack

by chenkaijiang＠bigknow.com.cn

Hi, all, I find that in Oct2010 branch (http://dev.monetdb.org/hg/MonetDB/shortlog/Oct2010), it looks like that the database cracking technology has been implemented. But looks like that it wasn't merged into the latest release (Jul2015), right? Why not merge this into the latest release? Is there any plan to merge it in the future?

6 years, 6 months

Re: Update: Extract Table Statistics after Data import using Monet.Read.Csv

by Anthony Damico

https://www.monetdb.org/bugzilla/show_bug.cgi?id=3835 next version release should fix this.. or use monetdblite which already has the fix (the example scripts i sent use monetdblite) On Dec 30, 2015 11:53 PM, "Jigar Shah" <jigar.shah1984(a)hotmail.com> wrote: > Thanks a lot Dr. Hannes, Anthony. The trick worked perfectly. See the > stats below: > > > > > > However, there is one odd behavior I have noticed. Even after completion > of the query, the RAM usage is still the same as when running the query. > The RAM usage only reduces once I terminate the connection and stop the > server. > > Is this behavior normal for the MonetDB server ? Also, ‘Src_MonetDB’ > creates a separate connection than ‘dbConnect’ > > Can the two connection run at the same time ? I noticed that sometimes > when I use the Src_MonetDB connection, the dbConnect gets terminated > automatically. > > Thanks a lot for your help on these. > > Best Regards, > > Jigar > > Sent from Mail <http://go.microsoft.com/fwlink/?LinkId=550986> for > Windows 10 > > > > > *From: *Anthony Damico <ajdamico(a)gmail.com> > *Sent: *Tuesday, December 29, 2015 6:22 AM > *To: *Communication channel for MonetDB users <users-list(a)monetdb.org> > *Subject: *Re: Extract Table Statistics after Data import using > Monet.Read.Csv > > > > for an example of this, see > > > https://github.com/ajdamico/asdfree/tree/master/Basic%20Stand%20Alone%20Med… > > On Dec 29, 2015 2:50 AM, "Hannes Mühleisen" <hannes.muehleisen(a)cwi.nl> > wrote: > > Hi Jigar, > > > On 29.12.2015, at 01:21, Jigar Shah <jigar.shah1984(a)hotmail.com> wrote: > > > > The dataset is divided into have 12 tables of approx. 2 GB each. In > order to recreate the entire dataset, I want to use the MERGE function to > merge all the 12 tables into one dataset for further analysis. > > > You can pass a vector of _all_ your file names to monetdb.read.csv(), this > will load all of them into a new table and does not require the merge. The > different schemas come from the function guessing the column types from the > file. > > Hannes > > _______________________________________________ > users-list mailing list > users-list(a)monetdb.org > https://www.monetdb.org/mailman/listinfo/users-list > > >

6 years, 6 months

Performing a direct access to MonetDB's BAT tables via MAL

by Giacomo Bergami

Good Morning/Evening everyone. My aim is to direcly access to the BAT column store representation of MonetDB through the standard libraries (MAPI/JDBC) - if possible. I know that each SQL query gets rewrited into a BAT algebra expression, but in my case I want to access to a single value per time (e.g. I want to access to the value stored in the i-th row and in the column labelled "j" of a given table) and maybe in this case the direct access is quicker than performing the whole SQL query. I've already tried to use the mclient with the MAL language and read the documentation, and I tried to use the client with something like this: mdb.start(); bbp.open(); bbp.prelude(); a := bbp.bind("fx", "size"); where "fx" should be the name of the table and "size" one of its attributes. But unfortunately I do not know how to search for a specific row-key and to get the correspondant value, and AFAIK i have to get the id of the column "size". Thanks in advance, Giacomo Bergami ____________________________ Giacomo Bergami, Ph.D Student University of Bologna https://www.unibo.it/sitoweb/giacomo.bergami2

6 years, 6 months

Almost all test cases failed in "sql" package

by Xu,Wenjian

Hi, I have compiled and installed MonetDB-11.21.11 (JUL2015-SP1) from pre-packaged source distribution. My environment is Ubuntu 14.04 LTS. I tried to run the test cases by the following command: $ sudo Mtest.py -r [package-name] I found that almost all tests PASSED when [package-name]=monetdb5, which is expected. But when I switched to [package-name]=sql, almost all tests FAILED. What is the reason? Or I did something wrong? Any idea would be helpful. Thanks. Best, Wenjian

6 years, 6 months

回复：Is there any MonetDB branch that supports B-tree index?

by chenkaijiang＠bigknow.com.cn

The lecture can also be found at http://homepages.cwi.nl/~manegold/teaching/adt/lectures/lecture5.pdf ----- 原始邮件 ----- 发件人：<chenkaijiang(a)bigknow.com.cn> 收件人：users-list<users-list(a)monetdb.org> 主题：Is there any MonetDB branch that supports B-tree index? 日期：2015-12-30 23:46:03 Hi, all, from page 2 of the attach lecture5.pdf, it looks like that MonetDB supports B-tree index in some branch? Is there any MonetDB branch that supports B-tree index? (I mean the persistent index that can be used in a query without creating it on the fly) Regards,Kaijiang

6 years, 7 months

Extract Table Statistics after Data import using Monet.Read.Csv

by Jigar Shah

Hello, I am trying to import a very large dataset of approx.. 170 million records. The dataset is divided into have 12 tables of approx. 2 GB each. In order to recreate the entire dataset, I want to use the MERGE function to merge all the 12 tables into one dataset for further analysis. However, when I try to add the table to merge table, it gives an error of type mismatch in columns. Can you please help me how to determine the column type after a ‘csv’ file has been imported using monet.red.csv ? I would like to use the same R interface to MonetDB as I am still learning MonetDB and not conversant with the DB. Thanks & Regards, Jigar Shah Sent from Mail for Windows 10

6 years, 7 months

am i doing something stupid, or should i file a bug report? this seems absurd :) thanks

by Anthony Damico

sql>create table my_table as select 1 with data; operation successful (57.729ms) sql>alter table my_table set read only; operation successful (5.488ms) sql>alter table my_table add column my_column integer; operation successful (10.563ms) sql>drop table my_table; operation successful (6.075ms) sql>

6 years, 7 months

Examples for lag and lead functions in monetdb

by Ashish Kumar Singh

Did anyone got lead and lag functions working with monetdb? Any test case , examples will be appreciated. Sent from Nine<http://www.9folders.com/>

6 years, 7 months

very low insertion speed

by poornima＠apakau.com

Hi, Is there something that I need to configure. I am inserting to a local database to a table with only one covered index. I am using jdbc to write. I am getting only 30-35 insertions/sec even on a new table. This seems very low. Am I missing something ? Regards, Poornima.

6 years, 7 months

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users-list December 2015