January 2018 - users-list

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

11 Aug '24

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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/

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[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/

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

24 Feb '24

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MonetDB Evaluation - Excessive slowness in a particular query
by Alfio Bettini 06 Feb '18

06 Feb '18

Hi all, we're testing MonetDB performances in order to understand if it could be possible to use it as data mart in our BI software. We're considering a set of queries executed in our test environment (CentOS 7, 32 GB RAM, 4 cpu). All the executed queries have quite good performances (between 10 and 45 seconds) except the following one that is taking several minutes in order to be executed: SELECT id, count(distinct value) FROM table GROUP BY id; The table contains 100 millions of data. It has about 130 columns (varchar, int, bigint, smallint, tinyint, timestamp, datetime). We have no BLOB/CLOB/Text types. The fields used in the query have these data types: id: int value: bigint Can you suggest us any optimizations in order to have this query run faster? Do you know some possible reasons why it's so slow? Kind Regards, Alfio Bettini The information contained in this message, together with any attachments, may be privileged and confidential and is intended for the use of the addressee(s) only. Any review, copying, use or distribution of this email by others (including any of its attachments) is strictly prohibited. If you are not the intended recipient, please destroy this email and its attachments and contact the sender immediately. This email was sent by EidosMedia SpA<http://www.eidosmedia.com>

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Crash using aggregate function inside a case statement in having clause
by Trevor Andreas 30 Jan '18

30 Jan '18

Hello, Database: MonetDB v11.27.11 (Jul2017-SP3) I am experiencing a crash when attempting to use an aggregate function inside a case statement in a having clause. Below is an example. One use case for this is that I am computing a formula on aggregated data, and want to ensure no divide by zero occurs. Are case statements in having clauses supported? Thanks! create table "t1" ( "id" int, "c1" varchar(100), "d1" int, "d2" int ); insert into "t1" values (1, 'A', 50, 80), (2, 'A', 200, 350), (3, 'A', 89, 125), (4, 'B', 4845, 13), (5, 'B', 194, 597), (6, 'C', 5636, 5802), (7, 'C', 375, 3405), (7, 'D', 365, 0), (7, 'D', 87, 0); -- Works select "c1", sum("d1") as "d1", sum("d2") as "d2" from "t1" group by "c1" having sum("d1") < case when 5 > 10 then 500 else 400 end; -- Works select "c1", sum("d1")as "d1", sum("d2") as "d2", 1.0 * sum("d1") / (1.0 * case when sum("d2") > 0 then sum("d2") else null end) as "formula" from "t1" group by "c1"; -- Crashes select "c1", sum("d1")as "d1", sum("d2") as "d2", 1.0 * sum("d1") / (1.0 * case when sum("d2") > 0 then sum("d2") else null end) as "formula" from "t1" group by "c1" having (1.0 * sum("d1") / (1.0 * case when sum("d2") > 0 then sum("d2") else null end)) > 1; Looking in merovingian.log: 2018-01-29 14:47:15 ERR test[2879]: *** Error in `/usr/bin/mserver5': double free or corruption (out): 0x00007f57200ea4b0 *** 2018-01-29 14:47:18 MSG merovingian[504]: database 'test' (2879) has crashed (dumped core) 2018-01-29 14:49:35 MSG merovingian[504]: database 'test' has crashed after start on 2018-01-29 14:42:36, attempting restart, up min/avg/max: 0s/0s/0s, crash average: 1.00 0.20 0.07 (2-0=2) 2

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Help with performance issue
by Roberto Cornacchia 26 Jan '18

26 Jan '18

Hi there, Would someone like to pick up this wonderful opportunity to tell me that I'm doing something silly? Please do. In this loop, the cleanup take 4/5 of the total time. Is there a better way of doing this? loop(...) { BAT *gn, *en, *hn; BAT *idxn, *tn, *pn; // tokenize, group, transform, append // this takes 1/5 of the total loop time if (BATutf8_tokenize(&tokens, s, delims, min_tok_len) != GDK_SUCCEED) goto fail; if (BATgroup(&gn, &en, &hn, tokens, NULL, NULL, NULL, NULL) != GDK_SUCCEED) goto fail; idxn = BATconstant(0, TYPE_int, &idx, BATcount(en), TRANSIENT); tn = BATproject(en,tokens); pn = BATconvert(hn, NULL, TYPE_dbl, TRUE); if (BATappend(br1,idxn,NULL,FALSE) != GDK_SUCCEED) goto fail; if (BATappend(br2,tn,NULL,FALSE) != GDK_SUCCEED) goto fail; if (BATappend(br3,pn,NULL,FALSE) != GDK_SUCCEED) goto fail; // this takes 4/5 of the total loop time BBPreclaim(idxn); BBPreclaim(tn); BBPreclaim(pn); BBPreclaim(hn); BBPreclaim(gn); BBPreclaim(en); BBPreclaim(tokens); }

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"brew install monetdb" failed due to "libxml2 library not found"
by Ying Zhang 25 Jan '18

25 Jan '18

Dear all, I try to install MonetDB with homebrew, but it failed with the error: configure: error: libxml2 library not found but required for MonetDB5 But as far as I can tell, libxml2 is already installed, e.g. $ brew list libxml2 /usr/local/Cellar/libxml2/2.9.7/bin/xml2-config /usr/local/Cellar/libxml2/2.9.7/bin/xmlcatalog /usr/local/Cellar/libxml2/2.9.7/bin/xmllint /usr/local/Cellar/libxml2/2.9.7/include/libxml2/ (47 files) /usr/local/Cellar/libxml2/2.9.7/lib/libxml2.2.dylib /usr/local/Cellar/libxml2/2.9.7/lib/cmake/libxml2/libxml2-config.cmake /usr/local/Cellar/libxml2/2.9.7/lib/pkgconfig/libxml-2.0.pc /usr/local/Cellar/libxml2/2.9.7/lib/python2.7/ (6 files) /usr/local/Cellar/libxml2/2.9.7/lib/ (3 other files) /usr/local/Cellar/libxml2/2.9.7/share/aclocal/libxml.m4 /usr/local/Cellar/libxml2/2.9.7/share/doc/ (153 files) /usr/local/Cellar/libxml2/2.9.7/share/gtk-doc/ (55 files) /usr/local/Cellar/libxml2/2.9.7/share/man/ (4 files) $ brew install libxml2 Warning: libxml2-2.9.7 already installed Is there anything I can do to fix this? Thanks a lot in advance! Jennie =============== Complete output of “brew install monetdb” =============== $ brew install monetdb Warning: You are using macOS 10.13. We do not provide support for this pre-release version. You may encounter build failures or other breakages. Please create pull-requests instead of filing issues. ==> Using the sandbox ==> Downloading https://www.monetdb.org/downloads/sources/Jul2017-SP3/MonetDB-11.27.11.tar.… Already downloaded: /Users/jennie/Library/Caches/Homebrew/monetdb-11.27.11.tar.xz ==> ./configure --prefix=/usr/local/Cellar/monetdb/11.27.11 --enable-debug=no --enable-assert=no --enable-optimi Last 15 lines from /Users/jennie/Library/Logs/Homebrew/monetdb/01.configure: checking how to link with libiconv... -liconv checking for iconv declaration... extern size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, size_t *outbytesleft); checking for library containing uuid_generate... none required checking for CC_MD5_Update... yes checking for CC_RIPEMD160_Update... no checking for CC_SHA1_Update... yes checking for CC_SHA224_Update... yes checking for CC_SHA256_Update... yes checking for CC_SHA384_Update... yes checking for CC_SHA512_Update... yes checking for pcre... yes checking whether pcre comes with UTF-8 support... yes checking for libxml2... no configure: error: libxml2 library not found but required for MonetDB5 READ THIS: https://git.io/brew-troubleshooting If reporting this issue please do so at (not Homebrew/brew): https://github.com/Homebrew/homebrew-core/issues Warning: You are using macOS 10.13. We do not provide support for this pre-release version. You may encounter build failures or other breakages. Please create pull-requests instead of filing issues.

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Re: MonetDB - question on rename table
by David Jankoski 25 Jan '18

25 Jan '18

hey sreejith, maybe this SO answer will be helfpul to you: https://stackoverflow.com/questions/19661538/how-to-rename-a-table-in-monet… hth. david On 25 January 2018 at 08:56, <users-list-request(a)monetdb.org> wrote: > Send users-list mailing list submissions to > users-list(a)monetdb.org > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.monetdb.org/mailman/listinfo/users-list > or, via email, send a message with subject or body 'help' to > users-list-request(a)monetdb.org > > You can reach the person managing the list at > users-list-owner(a)monetdb.org > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of users-list digest..." > > > Today's Topics: > > 1. MonetDB-extend clang error: ld: unknown option: -soname > (Ying Zhang) > 2. Re: MonetDB-extend clang error: ld: unknown option: -soname > (Sjoerd Mullender) > 3. "brew install monetdb" failed due to "libxml2 library not > found" (Ying Zhang) > 4. MonetDB - question on rename table (Sharma, Sreejith) > 5. Re: MonetDB - question on rename table (Stefan Manegold) > 6. RE: MonetDB - question on rename table (Sharma, Sreejith) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Wed, 24 Jan 2018 15:56:19 +0100 > From: Ying Zhang <Y.Zhang(a)cwi.nl> > To: Communication channel for MonetDB users <users-list(a)monetdb.org> > Subject: MonetDB-extend clang error: ld: unknown option: -soname > Message-ID: <1DD5C9B8-D559-4CD2-89E0-35CA729C9B67(a)cwi.nl> > Content-Type: text/plain; charset=utf-8 > > Dear all, > > I was trying to compile the regexp example in the MonetDB-extend repo on a Mac OS 10.13, but got an ?unknown option? error: > > $ make > cc -fPIC -DPIC -o lib_regexp.so -shared regexp.o -L/usr/local/opt/openssl/lib -L/Users/jennie/scratch/monet-install/Jul2017/debug/lib -L/usr/local/Cellar/pcre/8.41/lib -lmonetdb5 -lbat -lpcre -Wl,-soname -Wl,lib_regexp.so > ld: unknown option: -soname > clang: error: linker command failed with exit code 1 (use -v to see invocation) > make: *** [lib_regexp.so] Error 1 > > I looked around a bit. There are many discussions about clang error ld unknown option, but nothing specific for the ?-soname? option. Simply remove this option is not an option. > > Does anyone know how to fix/workaround this? > > Thanks a lot! > > Jennie > > ------------------------------ > > Message: 2 > Date: Wed, 24 Jan 2018 16:34:38 +0100 > From: Sjoerd Mullender <sjoerd(a)acm.org> > To: users-list(a)monetdb.org > Subject: Re: MonetDB-extend clang error: ld: unknown option: -soname > Message-ID: <78539081-3ab0-3b89-d22d-dbd12af4a6fa(a)acm.org> > Content-Type: text/plain; charset="utf-8" > > On 24/01/18 15:56, Ying Zhang wrote: >> Dear all, >> >> I was trying to compile the regexp example in the MonetDB-extend repo on a Mac OS 10.13, but got an ?unknown option? error: >> >> $ make >> cc -fPIC -DPIC -o lib_regexp.so -shared regexp.o -L/usr/local/opt/openssl/lib -L/Users/jennie/scratch/monet-install/Jul2017/debug/lib -L/usr/local/Cellar/pcre/8.41/lib -lmonetdb5 -lbat -lpcre -Wl,-soname -Wl,lib_regexp.so >> ld: unknown option: -soname >> clang: error: linker command failed with exit code 1 (use -v to see invocation) >> make: *** [lib_regexp.so] Error 1 >> >> I looked around a bit. There are many discussions about clang error ld unknown option, but nothing specific for the ?-soname? option. Simply remove this option is not an option. >> >> Does anyone know how to fix/workaround this? >> >> Thanks a lot! >> >> Jennie > > The question really is, how does one create a dynamically loaded module > on MacOS? The file will be loaded dynamically by mserver, not linked > into a program. > > > -- > Sjoerd Mullender > >

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Re: MonetDB - question on rename table
by Stefan Manegold 25 Jan '18

25 Jan '18

Yep: that feature is not implemented. -------- Original message --------From: "Sharma, Sreejith" <Sreejith.Sharma(a)harman.com> Date: 1/25/18 07:45 (GMT+01:00) To: Communication channel for MonetDB users <users-list(a)monetdb.org> Subject: MonetDB - question on rename table All, Any reason why we can’t do RENAME of table in MonetDB? Regards, Sreejith

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