users-list April 2020

users-list@monetdb.org

15 participants
11 discussions

Integer divided by integer never produces a real number

by Groot, Frank (Sociale Verzekeringsbank)

Hi, Can you tell me which of the following division outcomes is expected behaviour? --Division -- outcome select 10/3, -- 3 10/3.0, -- 3.333 10.0/3, -- 3.333 cast(10 as decimal(18,2))/3, -- 3.333 cast(10 as decimal(18,0))/3, -- 3 cast(10 as decimal(18,0))/3.0 -- 3.333 ; Personally, I would have expected all of the outcomes to be real numbers and not integers. Can you tell me if that is a realistic expectation? Kind regards, Frank Groot

2 years, 3 months

conditional DDL statements

by Roberto Cornacchia

Hi, I am afraid I know the answer to this already ("not supported"), but I wanted to check with you guys. Perhaps someone has smart workaround? Essentially what I would like to do is something like: IF condition THEN CREATE FUNCTION ....; As far as I know, flow control statements are only allowed inside functions/procedures. However, CREATE statements are not allowed inside functions/procedure. So I don't see any way to do what I wrote above. Notice, I am aware of CREATE OR REPLACE. What I'm looking for is an arbitrary condition test. Any trick? And/or, any plan to implement something in this direction? Roberto

2 years, 3 months

Integer divided by integer never produces a real number

by Groot, Frank (Sociale Verzekeringsbank)

2 years, 3 months

Compilation error macOS Catalina

by Ying Zhang

Hai all, Compiling MonetDB Mercurial source on macOS Catalina (10.15.4) results in the following error: /Users/jennie/monet/Nov2019/common/utils/mcrypt.c:476:3: error: 'CC_MD5_Final' is deprecated: first deprecated in macOS 10.15 - This function is cryptographically broken and should not be used in security contexts. Clients should migrate to SHA256 (or stronger). [-Werror,-Wdeprecated-declarations] MD5_Final(md, &c); ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/CommonCrypto/CommonDigest.h:282:37: note: expanded from macro 'MD5_Final' #define MD5_Final CC_MD5_Final ^ /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/CommonCrypto/CommonDigest.h:139:12: note: 'CC_MD5_Final' has been explicitly marked deprecated here extern int CC_MD5_Final(unsigned char *md, CC_MD5_CTX *c) ^ 7 errors generated. How can I get rid of this error? Disable -Wdeprecated-declarations? Or disable MD5 but use SHA256 instead? Thanks! Jennie

2 years, 3 months

sql.init() is gone?

by Torsten Grust

Dear MonetDB friends, I am about to start the next semester of my DB implementation course here at U Tübingen. The course peeks at the internals of a variety of DBMSs, PostgreSQL and MonetDB5 in particular. The discussion in that course relies on being able to use the functions in the MAL 'sql' module directly such that students can understand how SQL queries are compiled into sequences of MAL statements. MAL scripts that have worked perfectly for this in the past now already stop at the initial sql.init() command: $ mclient -d scratch -l mal Welcome to mclient, the MonetDB interactive terminal (Nov2019-SP3) [...] mal>sql.init(); MAPI = (monetdb) /tmp/.s.monetdb.50000 QUERY = sql.init(); ERROR = !TypeException:user.main[1]:'sql.init' undefined in: sql.init(); I am running version 11.35.19 (Nov2019-SP3). Have the magic incantations that talk to SQL from MAL changed? I'd appreciate any help here. Thanks, —Torsten -- | Prof. Dr. Torsten Grust | Database Systems — Universität Tübingen (Germany) | ✉︎ torsten.grust(a)uni-tuebingen.de | db.inf.uni-tuebingen.de

2 years, 3 months

SQL script autoload

by Roberto Cornacchia

Hi, Is there something similar to the lib/autoload folder, but for SQL scripts? My use case is: I have a bunch of UDFs. A SQL script defines their SQL interfaces The script is in lib/createdb. Sometimes I make changes to those UDFs, and their interfaces need to be updated. But my the script is only run on DB creation, so I have to manually go thorough all existing databases and run the script. The script is in a way idempotent, because it uses CREATE OR REPLACE, so I don't mind running it every time the database is started. But I can't find a way to do that.

2 years, 3 months

New client library for PHP

by Tamas Bolner

Hi, I spent the past nights creating a client library for PHP, because I found too many problems with the official one. Just for the heads up: https://github.com/bolner/MonetDB-PHP-Deux Happy Easter! Tamas

2 years, 3 months

RE: System Catalog - Objects creation date and time.

by Suresh Devarakonda

Hi, I just wanted to see when the objects such as tables created in MonetDB. I have looked at below note, but couldn't find the catalog tables that provides the table creation time so wondering if MonetDB has that capability. Can someone let me know at the earliest. Your early response is very much appreciated. https://www.monetdb.org/Documentation/SystemCatalog [cid:image002.jpg@01D60C19.28554180] Suresh Devarakonda 84.51<http://www.8451.com/>° TDO - Database Support Team D: 513.632.3692 M: 859.512.1839 A: 100 W. 5th Street, Cincinnati, Ohio 45202 Cincinnati | Chicago | New York | Portland Facebook<https://www.facebook.com/8451group/?ref=aymt_homepage_panel> LinkedIn<https://www.linkedin.com/company/84-51/?trk=biz-companies-cym> Instagram<https://www.instagram.com/84.51/> Twitter<https://twitter.com/8451group> Please consider the environment before printing this email.

2 years, 3 months

Running two databases with forward set to redirect (monetdbd)

by stephenb

We have an environment that does not support Unix domain sockets well. We thus configured monetdbd with forward=redirect, as we note from the monetdbd man page that "for local databases, the proxy method uses a UNIX domain socket feature" We can create two database, but trying to connect (on the default 50000 port) to them only the first-started database is available. If we try to connect to the second we get the error "request for database 'dev_sb2', but this is database 'dev_sb', did you mean to connect to monetdbd instead?". With some experimentation we have found that starting the databases directly using mserver5 and specifying different ports (--set mapi_port=50001 etc) we can connect to both databases, but this does complicate things and we would prefer to use the monetdb command for starting, stopping, creating etc. How can we configure monetdbd (or perhaps individual databases?) so that we can connect to two local databases through monetdbd and manage them using monetdb? Thanks Steve

2 years, 3 months

Fwd: [Help] create a new db user but need to add prefix 'sys.' in order to execute timestamp_to_str() function

by Kevin Chen

Hi, I have a new db user created by following scripts: CREATE USER "imdb" WITH PASSWORD 'imdb' NAME 'IMDB Explorer' SCHEMA "sys"; CREATE SCHEMA "imdb" AUTHORIZATION "imdb"; ALTER USER "imdb" SET SCHEMA "imdb"; When I tried to execute the function "timestamp_to_str", I have to add "sys." prefix to make it effective. "date_trunc" also needed to do so. The default user "monetdb" can run the function directly without the prefix. What should I do to perform the same way as user "monetdb" ? sql>select timestamp_to_str(localtimestamp, '%Y-%m-%d %H:%M:%S %z'); SELECT: no such binary operator 'timestamp_to_str(timestamp,char)' sql>select sys.timestamp_to_str(localtimestamp, '%Y-%m-%d %H:%M:%S %z'); +---------------------------+ | L2 | +===========================+ | 2020-04-06 20:37:39 +0800 | +---------------------------+ 1 tuple sql>select date_trunc('minute', timestamp '2119-02-17 02:08:12.345678'); SELECT: no such binary operator 'date_trunc(char,timestamp)' sql>select sys.date_trunc('minute', timestamp '2119-02-17 02:08:12.345678'); +----------------------------+ | L2 | +============================+ | 2119-02-17 02:08:00.000000 | +----------------------------+ 1 tuple

2 years, 3 months

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users-list April 2020