April 2015 - users-list

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

24 Feb '24

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Cluster advantages MonetDB
by Luciano Sasso 16 Jul '15

16 Jul '15

Hi, What the cluster Advantages MonetDB, If a query in shard tables in a cluster can not be ordered, what the advantage of using a MonetDB cluster? besides the replication in case of failure. Att, -- Luciano Sasso Vieira Data Scientist & Solutions Architect luciano(a)gsgroup.com.br <http://www.gsgroup.com.br> | tel: 17 3353-0833 | cel: 17 99706-9335 www.gsgroup.com.br <http://www.gsgroup.com.br> --- Este email foi escaneado pelo Avast antivírus. http://www.avast.com

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1-to-N (bat) UDF
by Roberto Cornacchia 15 Jun '15

15 Jun '15

Hi there, I need a string tokenizer in MonetDB. The problem I have is not with the function itself, but with the fact that this is a 1 to N rows function. Implementing this for a single string value is easy enough, using a table function that takes a string a returns a table: create function tokenize(s string) returns table (token string) external name tokenize; select * from tokenize("one two three"); That's fine. The issue I'm having is with extending this to a column of strings. Ideally, given a string column one two three four five six seven eight I'd like to get an output along these lines (simplistic representation here): one two three | one one two three | two one two three | three four five six | four four five six | five four five six | six seven eight | seven seven eight | eight I can sure code the c function and the mal wrapper to implement this, but I can't see how to map it to SQL, given that table functions don't accept identifiers as parameters. Any idea? Any possible workaround? Thanks, Roberto

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Problem selecting entries newer than a certain date
by Maarten Sander 01 May '15

01 May '15

Hi everyone, I’m probably missing something, but it seems that I cannot select entries that are newer than a given timestamp. Below are my attempts and the schema of the table. Any help would be greatly appreciated! Regards, Maarten sql>SELECT completed FROM "reporting"."transactions" WHERE completed >= '2015-04-10 00:00:00.0000' ORDER BY completed DESC; +-----------+ | completed | +===========+ +-----------+ 0 tuples (0.595ms) sql>SELECT completed FROM "reporting"."transactions" WHERE completed >= CAST('2015-04-10 00:00:00.0000' AS TIMESTAMP) ORDER BY completed DESC; +-----------+ | completed | +===========+ +-----------+ 0 tuples (0.328ms) sql>SELECT completed FROM "reporting"."transactions" ORDER BY completed DESC LIMIT 10; +----------------------------+ | completed | +============================+ | 2015-04-10 11:50:22.051000 | | 2015-04-10 10:55:50.039000 | | 2015-04-09 09:41:13.023000 | | 2015-04-09 09:39:09.079000 | | 2015-04-09 09:35:56.085000 | | 2015-04-08 12:55:13.007000 | | 2015-04-08 12:37:07.002000 | | 2015-04-08 12:28:22.000000 | | 2015-04-08 12:25:25.052000 | | 2015-04-07 21:59:59.099000 | +----------------------------+ 10 tuples (0.683ms) sql>\d "reporting"."transactions" CREATE TABLE "reporting"."transactions" ( "id" CHAR(36) NOT NULL, "status" VARCHAR(25) NOT NULL, "created" TIMESTAMP NOT NULL, "completed" TIMESTAMP, "currency" CHAR(3) NOT NULL, "amount" BIGINT NOT NULL, "balance" VARCHAR(25) NOT NULL, "payment_method" VARCHAR(50) NOT NULL, "fee_currency" CHAR(3), "fee_amount" BIGINT, "order_id" CHAR(36) NOT NULL, "order_status" VARCHAR(25) NOT NULL, "project_id" CHAR(36) NOT NULL, "merchant_id" CHAR(36) NOT NULL, CONSTRAINT "transactions_id_pkey" PRIMARY KEY ("id") );

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Efficient bulk load via JDBC?
by Roberto Cornacchia 29 Apr '15

29 Apr '15

Hello, Is there (or is there a plan for) efficient bulk load via JDBC? (I'm currently running Oct2014 and JDBC 2.13) I looked at: https://www.monetdb.org/book/export/html/340 As far as I understand, the most efficient way currently available in JDBC is to use batches of inserts via prepared statements (with autocommit off). Unfortunately this does not get even close to be fast enough. The speed of a COPY INTO is what I am looking for. But, this is not supported via JDBC. Is there a specific reason, or is it simply not implemented? I do know about the workaround of performing the COPY INTO via mapi protocol (like in http://dev.monetdb.org/hg/MonetDB/file/tip/java/example/SQLcopyinto.java). This provides good speed indeed. However, it is not transaction-safe. When I use this method, and some SQL transaction happens to read (only read!) from the same tables at the same time, then I often get data corruption: the COPY INTO seems to end well (and the data gets actually in place), but new SQL queries on those tables fail with a "BATproject: does not match always" GDK error (checking with gdb I see that the right side of a fetchjoin has count 0). Any idea?

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How to CREATE TRIGGER with a schema-qualifies table?
by Robert Koch 29 Apr '15

29 Apr '15

I have a schema "test" with 2 tables. I want to create a trigger inside this schema bound to a table inside this schema. sql>create trigger test.trigger1 after update on test.profiletab insert into test.triggerlog; syntax error, unexpected '.', expecting WHILE in: "create trigger test.trigger1 after update on test." Thank you.

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INSERT DEFAULT values only
by Robert Koch 28 Apr '15

28 Apr '15

How can I insert a row with default values only? CREATE TABLE test.tbl1 ( id bigint DEFAULT NEXT VALUE FOR "my_test_seq" NOT NULL, instime DATE DEFAULT now() NOT NULL ); Both insert into test.triggerlog (id) VALUES (10000); and insert into test.triggerlog (instime) VALUES (now()); work. Neither insert into test.triggerlog (id, instime) VALUES (DEFAULT, DEFAULT); nor insert into test.triggerlog (id, instime) VALUES (); work. What is the correct statement? Thank you.

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Confusing if MonetDB RDF/SparQL is supported
by Aris Setyawan 27 Apr '15

27 Apr '15

Hi All, In the recent week, I monitoring the monet's development commit logs. >From that logs, I have found that "RDF support was removed". But in the next log, some features under RDF was added. I'm bit confused about this. What is the state of RDF support in MonetDB? Thanks, -Aris

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Parallel Query
by Luciano Sasso 25 Apr '15

25 Apr '15

Hi, 1- On a single server, the query is executed in parallel?, Common relational database also has this ability (SQL Server, PostgreSQL etc.)? 2- And in a cluster, the same query is distributed for cluster nodes , in MonetDB? Att, -- Luciano Sasso Vieira Data Scientist & Solutions Architect luciano(a)gsgroup.com.br <http://www.gsgroup.com.br> | tel: 17 3353-0833 | cel: 17 99706-9335 www.gsgroup.com.br <http://www.gsgroup.com.br> --- Este email foi escaneado pelo Avast antivírus. http://www.avast.com

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How to create a user with administrator rights
by Puthick Hok 24 Apr '15

24 Apr '15

Hi, I wan to use "COPY INTO table from 'file'" SQL instruction with a user rather than monetdb. This user needs the administrator rights. So far I have done these using monetdb user as the login: CREATE USER "mdb_user" WITH PASSWORD '"password"' NAME 'Test db user' SCHEMA "sys"; CREATE ROLE "testdbadmin" WITH ADMIN CURRENT_USER; GRANT "testdbadmin" TO "mdb_user" WITH ADMIN OPTION; CREATE SCHEMA "testdb" AUTHORIZATION "mdb_user"; ALTER USER "mdb_user" SET SCHEMA "testdb"; I learnt this from MonetDB UserGuide tutorial and from MonetDB authorisation documentation. However, I still cannot use 'mdb_user' for COPY INTO from file command. What is missing? What does 'ADMIN OPTION' do? How to make 'mdb_user' have the same right as monetdb? At the moment, I'm using monetdb user directly. But, it would be a bit nicer to have a different username. I'm working on a web service connecting to 3 different databases: mysql, postgres and now monetdb. They have a common username for the database connection. If I keep using monetdb user, the commonality rule is broken. I have another to use 'mdb_user' via STDIN and piping, but exporting DOTMONETDBFILE as an environment variable to make mclient login with out asking for password is another complexity dimension. Making mdb_user to have administrator rights like monetdb is the best option for me if this is possible, and I hope this is possible. Regards, Puthick

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