June 2016 - users-list

[MonetDB-users] Books CDs
by CHARTS LICENSING 11 Aug '24

11 Aug '24

Everything you want to know this dynamic artist check. At blueberry hills duck, roomfull story gtgt getting. Intriguing, life in biography. Here music looking for lyrics maybe, youre find which! Download free wallpapers featuring business cmg worldwide is exclusive. Videos latest products been easier. Exclusive estate we consider request use name voice, image. List covered berries charts licensing message! Reelin and rockin about, has everything you? Many exciting, photos him stage click! Artist check, out some quotes read all intriguing. It alive he, did on occasion birthday wednesday? Has everything you want to know this? Quotes read all intriguing life, in biography or. Gtgt getting licks years reelin and. Click here, music looking for lyrics maybe, youre. News celebrates his th rock will never! Chuck berry news celebrates his th rock, will. Browse through many exciting, photos him stage click here. He did on occasion birthday wednesday night at blueberry. Wallpapers featuring business cmg worldwide. Worldwide is exclusive estate we consider, request use name. Want to know this dynamic artist check out. Awards fast, facts clips list covered. Music looking for lyrics maybe youre. Message board downloads tour dates fan, club inquiries. Other sites, download free wallpapers featuring, business cmg worldwide. Request use, name, voice.

2 1

Multi-column update based on joined table
by Lee Hachadoorian 11 Aug '24

11 Aug '24

I need to update multiple columns (~250) from one table to another based on a two-column key. In Postgres I would write this using the FROM clause, but since MonetDB doesn't support the FROM clause, I've successfully updated one column with: UPDATE census.acs2010_5yr SET b07401001 = ( SELECT CAST(b07401001 AS int) FROM acs2010_5yr.tmp_seq0001 WHERE acs2010_5yr.stusab = tmp_seq0001.stusab AND acs2010_5yr.logrecno = tmp_seq0001.logrecno ); My question is whether there is any benefit to writing a multiple column update into a single UPDATE statement: UPDATE target_table SET column1 = (SELECT column1 FROM source_table WHERE target_table.key = source_table.key), column2 = (SELECT column2 FROM source_table WHERE target_table.key = source_table.key), ..., columnN = (SELECT columnN FROM source_table WHERE target_table.key = source_table.key); On Postgres I believe the multi-column update using a table join would only have to do the sequential scan of each table once, but with the necessity of sub-selects in MonetDB, what is the backend doing? Is it already doing an index scan once for each row in the single column case, then doing it once for each row * column in the multi-column case? Best, --Lee -- Lee Hachadoorian Asst Professor of Geography, Dartmouth College http://freecity.commons.gc.cuny.edu/

3 3

[MonetDB-users] XQuery API and XLink/XUpdate support
by Alexandra Mart�nez 27 Jun '24

27 Jun '24

Hello all, I was wondering if there is any documentation about the API for XQuery (i.e., how to write xqueries from a Java program). Also, I am interested in using some features of XLink and XUpdate on top of my XML database. Is support for any of these in progress? Thanks in advance, Alexandra ______________________________________________________ Click here to donate to the Hurricane Katrina relief effort. http://store.yahoo.com/redcross-donate3/

4 3

[MonetDB-users] Proofreading your professional documents
by Richard Hounslow 24 Feb '24

24 Feb '24

Dear Professor/Lecturer Please excuse us for contacting you directly. We are offering an efficient service to help you ensure your academic and professional work is written in perfect English. We will check the grammar and style of your work and return it to you to meet your requirements and deadlines. Proof-Reading-Service.com can provide you with a professional proofreading service at a very reasonable rate. All our proofreaders are highly qualified native English speakers. Many work as leading academics in their fields and all have extensive experience of proofreading to the highest standards. If you are interested in our service, please take a look at our website: www.proof-reading-service.com All you have to do is send us your document as a word attachment with the deadline and we will guarantee delivery of a perfectly written document to give you complete confidence when you submit your work. The fee is worked out on a flat rate (£6.95 per thousand words or 0.695 pence per word), so you know exactly how much the proofreading will cost in advance. Once we have received your document(s) we will confirm the word count, the price and the deadline. If you have not heard from us within 2 hours during normal business hours after you have sent your work please resend it from a different email account or send the file to proofreadings(a)gmail.com. We look forward to hearing from you! Yours faithfully Proof-Reading-Service.com

2 2

SUM() OVER (ORDER BY..)
by Anthony Damico 13 Dec '16

13 Dec '16

hi, monetdb does not support SUM() OVER commands.. does anyone have a smart alternative to implement this? thanks SELECT batch_id, job_count, SUM(job_count) OVER (ORDER BY duration) as cumjobs, SUM(job_count) over () as totjobs, duration FROM test_data ;

5 13

[Low level] Understanding duplicate entries in delta BAT (delete BAT)
by Frédéric Jolliton 08 Aug '16

08 Aug '16

Hi, As per MonetDB Solution suggestion, we are asking here about this topic. We are studying how MonetDB store its database on disk. So far we were able to understand pretty much all the files (BAT, journal, BBP.dir, heap, hash, imprints, and so on). We have custom tools to decode and dump them (experimental at this point). There is one thing however that is unclear: we thought that "delta BAT", which are the BAT assigned to an SQL tables to list the OIDs of rows that were deleted (named "D_<schema>_<table>" internaly), would contains only *uniques* values (since you can never delete twice the same row). But on several databases that we are running, we found that some of theses BATs contain duplicates. Lot of duplicates actually. Especially on D_sys__columns and D_sys__tables BATs (respectively for the sys._columns and sys._tables system tables). Some databases do not have this "issue" (while they all have the same schema, and process the same kind of data as the other ones). Can someone explain if duplicates are expected in theses BATs ? Here is an excerpt of D_sys__tables: # hexdump -C 02/210.tail 00000000 2e 00 00 00 00 00 00 00 2f 00 00 00 00 00 00 00 |......../.......| 00000010 30 00 00 00 00 00 00 00 31 00 00 00 00 00 00 00 |0.......1.......| 00000020 32 00 00 00 00 00 00 00 33 00 00 00 00 00 00 00 |2.......3.......| 00000030 34 00 00 00 00 00 00 00 35 00 00 00 00 00 00 00 |4.......5.......| 00000040 36 00 00 00 00 00 00 00 37 00 00 00 00 00 00 00 |6.......7.......| 00000050 42 00 00 00 00 00 00 00 43 00 00 00 00 00 00 00 |B.......C.......| 00000060 44 00 00 00 00 00 00 00 45 00 00 00 00 00 00 00 |D.......E.......| 00000070 46 00 00 00 00 00 00 00 47 00 00 00 00 00 00 00 |F.......G.......| 00000080 48 00 00 00 00 00 00 00 49 00 00 00 00 00 00 00 |H.......I.......| 00000090 4a 00 00 00 00 00 00 00 4b 00 00 00 00 00 00 00 |J.......K.......| 000000a0 4c 00 00 00 00 00 00 00 4d 00 00 00 00 00 00 00 |L.......M.......| 000000b0 4e 00 00 00 00 00 00 00 4f 00 00 00 00 00 00 00 |N.......O.......| 000000c0 50 00 00 00 00 00 00 00 50 00 00 00 00 00 00 00 |P.......P.......| 000000d0 51 00 00 00 00 00 00 00 50 00 00 00 00 00 00 00 |Q.......P.......| 000000e0 51 00 00 00 00 00 00 00 52 00 00 00 00 00 00 00 |Q.......R.......| 000000f0 50 00 00 00 00 00 00 00 51 00 00 00 00 00 00 00 |P.......Q.......| 00000100 52 00 00 00 00 00 00 00 53 00 00 00 00 00 00 00 |R.......S.......| 00000110 50 00 00 00 00 00 00 00 51 00 00 00 00 00 00 00 |P.......Q.......| 00000120 52 00 00 00 00 00 00 00 53 00 00 00 00 00 00 00 |R.......S.......| ... You can clearly see duplicates OID (the first one being 0x50 at 0xc8). Its entry in BBP.dir (split into sections): 136 32 tmp_210 tmpr_210 02/210 610523782 2 171807 0 0 171807 172032 0 0 0 0 void 0 1 1793 0 0 0 0 0 1000651 0 0 0 oid 8 0 1024 24 25 27 1 46 773603235 1374456 1376256 1 We are using: MonetDB 5 server v11.21.14 (64-bit, 64-bit oids, 128-bit integers). -- Frédéric Jolliton Sécuractive

4 3

R UDFs
by Anderson, David B 06 Jul '16

06 Jul '16

All, Quick question, how many R interpreters are running within MonetDB if you are using R UDFs? Is there a single shared interpreter or are there multiple copies running? Thanks, Dave

2 16

python map
by Stefano Fioravanzo 04 Jul '16

04 Jul '16

Hello, I have a long and complex embedded python function. This function depends on the single rows of the input columns, so I would like to parallelize it. I’ve read about the post on embedded python and python_map. I understand that using python_map should automatically split (in a not specified way) the input columns and fire different (how many?) python processes executing on their input slice. Finally it should pack all the partial results. Well, I have tried to use python_map, but nothing different happened. Is there something more I have to do apart from setting LANGUAGE PYTHON_MAP? Regards, Stefano

2 9

Positional placeholders in prepared statement
by Frank Tetzel 29 Jun '16

29 Jun '16

Hi, does MonetDB support positional placeholders like '$1' instead of just '?' in prepared statements? I want to refer to a parameter more than once and possibly also out of order. Is there some alternative available? Regards, Frank

2 1

Resetting monetdb administrative password
by Roman S 29 Jun '16

29 Jun '16

Hello, Can somebody tell me how to reset monetdb administrative password? I’ve tried to stop mserver5, start it manually, oldp:=clients.getPasswordHash(“monetdb"); newp:=clients.backendsum("newpassword"); clients.changePassword(oldp, newp); Stoping it again and start in normal mode But it didn’t help: mclient --database=mydb --user=monetdb password:<usingnewpass> InvalidCredentialsException:checkCredentials:invalid credentials for user 'monetdb'

2 2