- users-list - monetdb.org

[MonetDB-users] EPS / SVG of new MonetDB logo
by Stefan de Konink 20 Sep '11

20 Sep '11

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Hi, The new logo is online on the new website for a while now, is there any EPS/SVG or other vector format available? Stefan -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEAREKAAYFAk547rYACgkQYH1+F2Rqwn14VwCgioRrllvOlEUwHJke6eLxdXca rm0An2CwkBr1KoUWmgYewB64U5B49GtS =ef+A -----END PGP SIGNATURE-----

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[MonetDB-users] GUID
by Michal Dvorak 20 Sep '11

20 Sep '11

Hi MonetDB-Team, are you going to implement 128b GUID? If not, any idea how to bypass it? 2x Int64 or BLOB(128)? Thank you very much for your answer J Best regards, Michal

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[MonetDB-users] Maximum Parallelism and Recommended Hardware for MonetDB
by brien colwell 20 Sep '11

20 Sep '11

I set up a MonetDB server for a data mining team on a single node. The node's specs are 32 cores (4x8 AMD 2.3GHz) 128GiB RAM, with the dbfarm on a RAID0 2xSSD (I think they are Intel SSDs). MonetDB on this hardware works well for aggregates and joins on integers, but chugs considerably on inline views with strings and joins with strings. The team usually has 2-3 concurrent jobs at any given time, some materializing new tables, with lots of bulk loading ("copy into ... from file ..."). A typical table size is 2GiB, and queries may join 5-10 tables. When I look at process activity on the node, I usually see each DB's mserver5 process pegged on CPU, using just a single core. Since I rarely see more than one core used per mserver5, I'm starting to think either I haven't configured MonetDB to favor parallel plans, or I chose the wrong hardware for MonetDB. So, as questions to everyone on the list, I'm curious 1) Are there knobs in MonetDB to favor parallel execution plans? 2) What's the ideal hardware for a single-node MonetDB server to support a workload of 2-5 concurrent queries? 3) What's the ideal disk configuration for the above? Brien

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[MonetDB-users] How to compress a table
by Alexis Berlemont 20 Sep '11

20 Sep '11

Hi, I am currently trying to evaluate MonetDB as a solution to hold significant amounts of data. Because of limited storage capacities, I am trying to enable compression in MonetDB. I did not manage to find any tutorial on that subject, so I did not go very far. I cannot even tell that I wholly understand the problem. According to the page "Documentation->User Guide->compression", I understood that I had to inject a compression optimizer inside a pipeline. This "thing" is supposed to be possible via the setting of a sql environment variable named "optimizer". In the (generated) source file monetdb5/optimizer/opt_pipes.c, I found a default + compression pipeline. Then, in a mclient session, I typed: sql>set optimizer='inline,remap,evaluate,costModel,coercions,emptySet,aliases,mergetable,deadcode,constants,commonTerms,joinPath,deadcode,reduce,dataflow,compression,dataflow,history,multiplex,garbageCollector'; After that, I tried to use a sql function which was supposed to compress (thanks to the zlib) a table: sql.gzcompress sql>call gzcompress(myschema, mytable); Unfortunately, I am stuck here with the error message 'SELECT: identifier 'myschema' unknown'. I think I located the error message in "sql/server/rel_select.c" but I did not manage to deduce anything interesting. Do you have any idea ? Thanks in advance. Alexis.

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[MonetDB-users] How to change in/out date format
by Eugene Prokopiev 20 Sep '11

20 Sep '11

Hi, is it possible to use "yy-MM-dd HH:mm:ss.SSS" date format via something like SET DATESTYLE in COPY INTO ... FROM ... with mclient to reuse existing files? -- Thanks, Eugene Prokopiev

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[MonetDB-users] query time
by anagnostes 20 Sep '11

20 Sep '11

Hi. I would like to know if it's possible to get the query time using the input "\<file" and redirecting the output to "\>file" in Windows. When i use the input file it nevers throws the query time. So i can't know it. Thank you. -- View this message in context: http://old.nabble.com/query-time-tp32232809p32232809.html Sent from the monetdb-users mailing list archive at Nabble.com.

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[MonetDB-users] Memory leaks in the latest trunk?
by Stefan de Konink 20 Sep '11

20 Sep '11

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Hello, Recently I decided it was again a good idea(tm) to 'test' the latest MonetDB trunk on an updated dataset. Sadly over the last 6 days I observed a growing memory usage, today resulting in a segmentation fault. For now nothing more than mserver5[26142]: segfault at 8 ip 00007f1e1e592a31 sp 00007f1e00ca63b8 error 4 in libc-2.13.so[7f1e1e515000+17d000] is known to me, which is development wise totally useless. But an other question did arise: is testing currently taking memory into a count? Especially longer tests might show greater usage of memory. It is obviously no problem replay all the queries that ran against the database and valgrind it... but there might have been work done from development respective that can shed light over the problems. Stefan -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEAREKAAYFAk5OiAAACgkQYH1+F2Rqwn3d+ACdH5ySymgx46EON89qdnlYof39 ZHsAn1LjL9eOHncOjM99+wAupwMC6OR3 =BsVB -----END PGP SIGNATURE-----

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[MonetDB-users] count slower than expected?
by Joris Slob 20 Sep '11

20 Sep '11

Hello mailing list! This is my first attempt to ask a question here, so please excuse my ignorance. For large tables (>1M rows), I encounter strange behavior when using the COUNT function in SQL in the mclient. When I do the following query: SELECT DISTINCT(predicate) FROM facts; I get a nice resultset of 31 tuples in 20ms. When I try the following query: SELECT COUNT(DISTINCT(predicate)) FROM facts; I get my answer in 565ms. It seems weird that the database doesn't 'optimize' this count to: SELECT COUNT(*) FROM (SELECT DISTINCT(predicate) FROM facts) AS b; I get my answer in 20ms. The facts table is defined as follows: CREATE TABLE "sys"."facts" ( "subject" CHAR(2048), "predicate" CHAR(2048), "object" CHAR(2048) ); This is my first attempt to make a knowledge store and I am aware there is lots I can do to optimize how I store the data. I was just surprised that the count took significantly longer than getting all the results out and counting them. Here is the version information of MonetDB I am using: MonetDB 5 server v11.3.7 "Apr2011-SP2" (32-bit, 32-bit oids) Copyright (c) 1993-July 2008 CWI Copyright (c) August 2008-2011 MonetDB B.V., all rights reserved Visit http://monetdb.cwi.nl/ for further information Found 1.0GiB available memory, 2 available cpu cores Libraries: libpcre: 7.8 2008-09-05 (compiled with 7.8) openssl: OpenSSL 0.9.8k 25 Mar 2009 (compiled with OpenSSL 0.9.8k 25 Mar 2009) libxml2: 2.7.6 (compiled with 2.7.6) Compiled by: root(a)ottar.ins.cwi.nl (i486-pc-linux-gnu) Compilation: gcc -Wall -O6 -fomit-frame-pointer -finline-functions -falign-loops=4 -falign-jumps=4 -falign-functions=4 -fexpensive-optimizations -funroll-loops -frerun-cse-after-loop -frerun-loop-opt -ftree-vectorize Linking : /usr/bin/ld -Wl,-Bsymbolic-functions Greetings, Joris

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[MonetDB-users] omission in documentation?
by Sander Kruseman 20 Sep '11

20 Sep '11

Hi, I'm unable to find documentation on 'mapi_open' on the new website. I read the 5 available man pages, but found no mention of it. The man page for monetdb does however, mention monetdb.conf(5) but I cannot find that one either. Am I overlooking something? regards, Sander Kruseman

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[MonetDB-users] Announcement: New Apr2011-SP2 bugfix release of MonetDB suite
by Sjoerd Mullender 16 Sep '11

16 Sep '11

The MonetDB team at CWI/MonetDB BV is pleased to announce the Aug2011 feature release of the MonetDB suite of programs. The default width for OID columns in the database is now 64 bits for all 64-bit architecture. In releases up to this release, the default width on 64-bit Windows was still 32 bits. This means that with the current release it is possible to have tables with more than about 2 million rows even on Windows (as long as you use a 64-bit build). More information (including release notes) on this release is available at <http://www.monetdb.org/Downloads/ReleaseNotes>. As usual, the download location is <http://dev.monetdb.org/downloads/>. -- Sjoerd Mullender

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[MonetDB-users] Calling a stored procedure from java
by elarios 13 Sep '11

13 Sep '11

Hi, Please, I would like to know the correct sintaxis for calling a stored procedures in MonetDB from a Java application. I was using some code that works fine in MySQL but this doesn't work in MonetDB. The code inside a method is: ------------------------------------------------------------------- Connection con = null; ResultSet rs = null; CallableStatement cs = null; cs = con.prepareCall("{call hts.spInsertFile(?)}"); File fl = new File("/home//Test/example.pdf"); imgfile = new FileInputStream(fl); cs.setBinaryStream(1,imgfile); rs = cs.executeQuery(); ------------------------------------------------------------------- When I execute the stored procedure from Netbeans IDE the stored procedure works fine. I've made a trace in the application and the statement: con.prepareCall("{call hts.spInsertFile(?)}"); returns null and finally throws an exception: Exception in thread "main" java.lang.NullPointerException at testmonetdb.DBase.set_file(DBase.java:86) at testmonetdb.MonetDBTest.main(MonetDBTest.java:34) The MonetDB version I'm using is: MonetDB 5 server v11.3.7 "Apr2011-SP2" (64-bit, 64-bit oids) Copyright (c) 1993-July 2008 CWI Copyright (c) August 2008-2011 MonetDB B.V., all rights reserved Visit http://monetdb.cwi.nl/ for further information Found 3.9GiB available memory, 4 available cpu cores Libraries: libpcre: 8.12 2011-01-15 (compiled with 8.10) openssl: OpenSSL 1.0.0d 8 Feb 2011 (compiled with OpenSSL 1.0.0d-fips 8 Feb 2011) libxml2: 2.7.7 (compiled with 2.7.7) Compiled by: mockbuild@ (x86_64-unknown-linux-gnu) Compilation: gcc -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -O6 -fomit-frame-pointer -finline-functions -falign-loops=4 -falign-jumps=4 -falign-functions=4 -fexpensive-optimizations -funroll-loops -frerun-cse-after-loop -frerun-loop-opt -ftree-vectorize Linking : /usr/bin/ld -m elf_x86_64 I'm also using Netbeans IDE 7.1 with the jdbcclient.jar (http://dev.monetdb.org/downloads/Java/Oct2010-SP1/) Thanks in advance for your help, Enrique. -- View this message in context: http://old.nabble.com/Calling-a-stored-procedure-from-java-tp32431606p32431… Sent from the monetdb-users mailing list archive at Nabble.com.

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[MonetDB-users] Does MonetDB support materialized view or not?
by Ken Cheng 03 Sep '11

03 Sep '11

Hi All, Does MonetDB support materialized view or not? Yours sincerely, Ken Cheng

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[MonetDB-users] stack protector error
by Michael Sioutis 27 Aug '11

27 Aug '11

Hello, I get an error when trying to compile latest MonetDB default branch on my Ubuntu 10.04 64bit machine. bootstrap: OK configure (../configure --prefix=/opt/MonetDB/ --enable-monetdb5 --enable-sql --enable-rdf --enable-geom --enable-bits=64 --enable-debug --enable-datacell): OK make -j2: ERROR The error is: ../../gdk/gdk_batop.mx: In function ‘BATsetprop’: ../../gdk/gdk_batop.mx:2890: error: not protecting function: no buffer at least 8 bytes long I think flags -fstack-protector-all and -Wstack-protector are to blame, they default to 8 bytes. I can skip the problem if I set 8 byte long dummy buffers to EVERY function that doesn't have such a buffer, e.g., char mybuf[8]; memset(buf, 0, sizeof(buf)); I also thought of setting the buffer size to 1, by passing --param spp-buffer-size=1 as a compiler option, but then I get various other errors. gcc version: gcc (Ubuntu 4.4.3-4ubuntu5) 4.4.3 Copyright (C) 2009 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Mike

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[MonetDB-users] Current Pathfinder list/team
by Anton Kolev 21 Aug '11

21 Aug '11

Gentlemen, Which is the proper current list (or personal contact) for the Pathfinder related questions? Are there recent work after Mar2011 branch [1]? Thank you in advance, Anton [1] http://dev.monetdb.org/hg/MonetDB/file/932a58fecbde/pathfinder

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[MonetDB-users] Does MonetDB support regular expression predicates?
by Viktor Rosenfeld 21 Aug '11

21 Aug '11

Hi, does MonetDB support regular expression matching on strings? It's supposedly part of SQL:99, but I couldn't find anything about this on the homepage or the mailing list. I only found the Data Manipulation reference, which lists LIKE predicates. Cheers, Viktor

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[MonetDB-users] Are there any unit test for each checkin/fix
by Ken Cheng 20 Aug '11

20 Aug '11

Hi All, Are there any unit test for regression test for each checkin/fix? Seems I can not find any test related source check in history. Yours sincerely, Ken Cheng

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[MonetDB-users] Compiling MonetDB with JDBC on OS X 10.6
by Viktor Rosenfeld 18 Aug '11

18 Aug '11

Hi, I've tried building the latest MonetDB sources on OS X 10.6.8 and it fails with the following error message: checking for ant... /usr/bin/ant checking for java... /usr/bin/java checking for javac... /usr/bin/javac checking for jar... /usr/bin/jar checking for javadoc... /usr/bin/javadoc configure: error: MonetDB JDBC requires ant and Java 1.5 I used the following build options: ./configure --prefix=/Users/he-sk/unix --enable-strict --disable-assert --disable-debug --enable-optimize --enable-jdbc Searching on the mailing list, I found a post saying that the MonetDB JDBC driver will not build with Java 1.6 (the default on OS X 10.6), because the JDBC API changed from 1.5 to 1.6. However, the post is from September 2008, almost 3 years ago. Is this still the case? Or am I running into a different problem? List post: http://old.nabble.com/Installation-Problems-to19607306.html#a19645299 If MonetDB JDBC does require 1.5, I'm thinking of following the steps outlined here: http://wiki.oneswarm.org/index.php/OS_X_10.6_Snow_Leopard Does anybody have experience with this procedure or does anybody know an alternative? Also, I'm about to upgrade to OS X Lion (10.7). Is anybody running the MonetDB JDBC driver on Lion yet? Are you running it from sources or did you install the binary MonetDB distribution? Cheers, Viktor

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[MonetDB-users] How to update one table from another
by Eugene Prokopiev 12 Aug '11

12 Aug '11

Hi, I have two tables: table1 ----------- id data ----------- 0 0 1 1 2 2 ----------- table2 ----------- id data ----------- 2 2 3 3 ----------- I need to increment data in big table1 by data from small table2 if it exists or insert absent data from table2 to table1. So result must looks like: table1 ----------- id data ----------- 0 0 1 1 2 4 3 3 ----------- I used loop by table2 rows and inserts or updates table1 in this loop in PostgreSQL. What is the most effective way to do it in MonetDB? -- Thanks, Eugene Prokopiev

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[MonetDB-users] JOIN for functions
by Eugene Prokopiev 09 Aug '11

09 Aug '11

Hi, Is it possible to join functions which returns tables? I've got error: sql>select sumdate from summary_ip_in('wan') limit 1; +------------+ | sumdate | +============+ | 2-08-11 | +------------+ 1 tuple (1m 14s) sql>select sumdate from summary_ip_out('wan') limit 1; +------------+ | sumdate | +============+ | 2-08-11 | +------------+ 1 tuple (10m 59s) sql>select sumdate from summary_ip_in('wan') inner join summary_ip_out('wan') on summary_ip_in.sumdate = summary_ip_out.sumdate limit 1; SELECT: no such column 'summary_ip_in.sumdate' sql>select sumdate from summary_ip_in('wan') inner join summary_ip_out('wan') on sumdate = sumdate limit 1; SELECT: identifier 'sumdate' ambiguous What's wrong? -- Thanks, Eugene Prokopiev

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[MonetDB-users] Check for inet equals
by Eugene Prokopiev 06 Aug '11

06 Aug '11

Hi, How to select from table by value in column with INET type? For example, I have table: $ msqldump -d billing -- msqldump dump database Mon Aug 1 11:03:13 2011 -- MonetDB v11.3.3, 'b0' START TRANSACTION; SET SCHEMA "sys"; CREATE TABLE "sys"."transfer_ip" ( "packetdate" TIMESTAMP, "proto" INTEGER, "src" INET, "sport" INTEGER, "sintf" VARCHAR(15), "dst" INET, "dport" INTEGER, "dintf" VARCHAR(15), "packets" BIGINT, "bytes" BIGINT, "prefix" VARCHAR(5), "processed" BOOLEAN ); COMMIT; COPY 10293965 RECORDS INTO "sys"."transfer_ip" FROM stdin USING DELIMITERS '\t','\n','"'; ^C I tried to select in such ways: # mclient -d billing Welcome to mclient, the MonetDB/SQL interactive terminal (Apr2011-SP1) Database: MonetDB v11.3.3, 'billing' Type \q to quit, \? for a list of available commands auto commit mode: on sql>select * from transfer_ip where src = '10.7.1.10' limit 10; SQLException:str_cast:value too long for type (var)char(9) sql>select * from transfer_ip where src = '10.7.1.10':inet limit 10; unexpected symbol (:) sql>select * from transfer_ip where src << '10.7.1.10' limit 10; types inet(0,0) and tinyint(8,0) are not equal for column 'src' What it the right way? -- Thanks, Eugene Prokopiev

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[MonetDB-users] openssl not found when it is present
by Medha Atre 04 Aug '11

04 Aug '11

I am trying to compile MonetDB-11.3.7 on Ubuntu 10.04 distribution (2.6.32-33 64 bit kernel). It fails with "openssl" not found error: I am running configure script with following options: $ ./configure --prefix=/work2/MonetDB-install-11.3.7 --enable-optimize --enable-sql --enable-monetdb5 <snip> checking for iconv... yes checking for working iconv... yes 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... no checking for openssl... no configure: error: OpenSSL library not found but required for MonetDB5 $ openssl libraries are present on my system. I tried: $ cd /lib $ ll *ssl* -rw-r--r-- 1 root root 333856 2011-02-09 20:50 libssl.so.0.9.8 $ $ $ sudo apt-get install openssl Reading package lists... Done Building dependency tree Reading state information... Done openssl is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. $ Can someone please let me know if I am missing any step or need to do something else for the configure script to find SSL libraries? Thanks in anticipation. Medha

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[MonetDB-users] Long running query with count(distinct ...)
by Eugene Prokopiev 02 Aug '11

02 Aug '11

Hi, I have table with 81 887 010 rows. Select count from this table works fine, but I can't wait for the results of select count(distinct ...) from this table. Why can it be? sql>explain select count(src) from transfer_ip; +----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | mal | +==================================================================================================================================================================================+ | function user.s1_1{autoCommit=true}():void; | | barrier _55 := language.dataflow(); | | _2 := sql.mvc(); | | _39:bat[:oid,:inet] := sql.bind(_2,"sys","transfer_ip","src",0,0,2); | | _43 := algebra.selectNotNil(_39); | | _35:bat[:oid,:inet] := sql.bind(_2,"sys","transfer_ip","src",2,0,2); | | _45 := algebra.kdifference(_43,_35); | | _41 := algebra.selectNotNil(_35); | | _47 := algebra.kunion(_45,_41); | | _6:bat[:oid,:oid] := sql.bind_dbat(_2,"sys","transfer_ip",1); | | _9 := bat.reverse(_6); | | _49 := algebra.kdifference(_47,_9); | | _51 := aggr.count(_49); | | _40:bat[:oid,:inet] := sql.bind(_2,"sys","transfer_ip","src",0,1,2); | | _44 := algebra.selectNotNil(_40); | | _38:bat[:oid,:inet] := sql.bind(_2,"sys","transfer_ip","src",2,1,2); | | _46 := algebra.kdifference(_44,_38); | | _42 := algebra.selectNotNil(_38); | | _48 := algebra.kunion(_46,_42); | | _52 := aggr.count(_48); | | _10:bat[:oid,:inet] := sql.bind(_2,"sys","transfer_ip","src",1); | | _11 := algebra.selectNotNil(_10); | | _53 := aggr.count(_11); | | _50 := mat.pack(_51,_52,_53); | | _54 := algebra.selectNotNil(_50); | | _14 := aggr.sum(_54); | | exit _55; | | sql.exportValue(1,"sys.transfer_ip","L4","wrd",64,0,6,_14,""); | | end s1_1; | +----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 29 tuples (12.925ms) sql>explain select count(distinct src) from transfer_ip; +----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ | mal | +==================================================================================================================================================================================+ | function user.s2_1{autoCommit=true}():void; | | barrier _56 := language.dataflow(); | | _2 := sql.mvc(); | | _42:bat[:oid,:inet] := sql.bind(_2,"sys","transfer_ip","src",0,0,2); | | _46 := algebra.selectNotNil(_42); | | _38:bat[:oid,:inet] := sql.bind(_2,"sys","transfer_ip","src",2,0,2); | | _48 := algebra.kdifference(_46,_38); | | _44 := algebra.selectNotNil(_38); | | _50 := algebra.kunion(_48,_44); | | _6:bat[:oid,:oid] := sql.bind_dbat(_2,"sys","transfer_ip",1); | | _9 := bat.reverse(_6); | | _52 := algebra.kdifference(_50,_9); | | _53 := bat.reverse(_52); | | _43:bat[:oid,:inet] := sql.bind(_2,"sys","transfer_ip","src",0,1,2); | | _47 := algebra.selectNotNil(_43); | | _41:bat[:oid,:inet] := sql.bind(_2,"sys","transfer_ip","src",2,1,2); | | _49 := algebra.kdifference(_47,_41); | | _45 := algebra.selectNotNil(_41); | | _51 := algebra.kunion(_49,_45); | | _54 := bat.reverse(_51); | | _10:bat[:oid,:inet] := sql.bind(_2,"sys","transfer_ip","src",1); | | _11 := algebra.selectNotNil(_10); | | _55 := bat.reverse(_11); | | _14 := mat.pack(_53,_54,_55); | | _15 := algebra.kunique(_14); | | _16 := bat.reverse(_15); | | _17 := aggr.count(_16); | | exit _56; | | sql.exportValue(1,"sys.transfer_ip","L5","wrd",64,0,6,_17,""); | | end s2_1; | +----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 30 tuples (1.238ms) -- Thanks, Eugene Prokopiev

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[MonetDB-users] Vacuum command missing
by Eugene Prokopiev 01 Aug '11

01 Aug '11

Hi, I can't find VACUUM command in http://www.monetdb.org/Documentation, I see only vacuum cleaning algorithm mention in http://www.monetdb.org/Documentation/Manuals/SQLreference/Transactions. So, how can phisicaly delete rows after marking them as deleted? -- Thanks, Eugene Prokopiev

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[MonetDB-users] RDF support in MonetDB-11.3.7?
by Medha Atre 31 Jul '11

31 Jul '11

Hello, While compiling MonetDB-11.3.7 from sources, in the configure options, I saw an option "--enable-rdf". I was wondering how this option can be used to load RDF data directly into MonetDB? MonetDB's documentation on the web could not help much. Any pointers will be appreciated. Thanks in anticipation. Medha

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[MonetDB-users] Announcement: New Apr2011-SP2 bugfix release of MonetDB suite
by Sjoerd Mullender 29 Jul '11

29 Jul '11

The MonetDB team at CWI/MonetDB BV is pleased to announce the Apr2011-SP2 bug fix release of the MonetDB suite of programs. This is the first release with support for Fedora 15. Fedora 13 is no longer supported. One important bug fix has to do with columns with string (char/varchar) values. There was a bug that could cause exponential growth of the file holding the data for the column. This bug has been fixed. If you have a database that is much larger than you would expect for the amount of data, this might be the cause. The remedy is to dump and restore that database (or just the affected tables). Apart from using up too much space, this bug didn't have any other consequences. More information (including release notes) on this release is available at <http://www.monetdb.org/OldReleaseNotes/Apr2011>. As usual, the download location is <http://dev.monetdb.org/downloads/>. -- Sjoerd Mullender

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