Database tables for Exchange rates
I am designing a database to store exchange rates and other information. The tables fro the exchange rates will store exchange rates fro all currencies. Can I have any suggestions about the number of tables to use for the exchange rate? I think I will need at least 2 tables, but I am looking for suggestions on how to achieve maximum speed when querying the database and also avoid redundant tables or rows. Mimi -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Database tables for Exchange rates
For the exchange rates only you don't really need more than one table. I work with an enterprise financial system and we have exchange rate tables which are updated with data every day. Something like BASE_CURR char(3) NONBASE_CURR char(3) EFF_DATE DATE EXCH_RATE DECIMAL(15,6)-- or however much precision you need We have other columns storing tolerances but that should be enough. First 3 columns are your key. Separate tables for the currency codes themselves. On Mon, May 10, 2010 at 7:28 AM, Mimi Cafe mimic...@googlemail.com wrote: I am designing a database to store exchange rates and other information. The tables fro the exchange rates will store exchange rates fro all currencies. Can I have any suggestions about the number of tables to use for the exchange rate? I think I will need at least 2 tables, but I am looking for suggestions on how to achieve maximum speed when querying the database and also avoid redundant tables or rows. Mimi -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=pchap...@nc.rr.com -- Distributed Computing stats http://stats.free-dc.org
Re: Out of range value for column 'datestamp' at row 1
On 2010-05-09 13:29, Prabhat Kumar wrote: INSERT INTO myTable_info (id,range, total_qt, qt_correct, finish_time, username, datestamp) VALUES (NULL,'Kumar', '20', '17', '111', 'Prabhat','* NOW()');* Last_SQL_Error: Error 'You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax I think problem with* `datestamp` datetime NOT NULL default '-00-00 00:00:00',* Can any one please suggest me, how to deal with this error. Remove the ' around NOW(). ' Makes NOW() a literal string and not a function call. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: Out of range value for column 'datestamp' at row 1
Thanks, It worked :) On Mon, May 10, 2010 at 6:25 PM, Jay Ess li...@netrogenic.com wrote: On 2010-05-09 13:29, Prabhat Kumar wrote: INSERT INTO myTable_info (id,range, total_qt, qt_correct, finish_time, username, datestamp) VALUES (NULL,'Kumar', '20', '17', '111', 'Prabhat','* NOW()');* Last_SQL_Error: Error 'You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax I think problem with* `datestamp` datetime NOT NULL default '-00-00 00:00:00',* Can any one please suggest me, how to deal with this error. Remove the ' around NOW(). ' Makes NOW() a literal string and not a function call. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=aim.prab...@gmail.com -- Best Regards, Prabhat Kumar MySQL DBA Datavail-India Mumbai Mobile : 91-9987681929 www.datavail.com My Blog: http://adminlinux.blogspot.com My LinkedIn: http://www.linkedin.com/in/profileprabhat
RE: Database tables for Exchange rates
Hi Phil Yep, it looks like that will do. Thanks -Original Message- From: freedc@gmail.com [mailto:freedc@gmail.com] On Behalf Of Phil Sent: 10 May 2010 13:53 To: mysql@lists.mysql.com Subject: Re: Database tables for Exchange rates For the exchange rates only you don't really need more than one table. I work with an enterprise financial system and we have exchange rate tables which are updated with data every day. Something like BASE_CURR char(3) NONBASE_CURR char(3) EFF_DATE DATE EXCH_RATE DECIMAL(15,6)-- or however much precision you need We have other columns storing tolerances but that should be enough. First 3 columns are your key. Separate tables for the currency codes themselves. On Mon, May 10, 2010 at 7:28 AM, Mimi Cafe mimic...@googlemail.com wrote: I am designing a database to store exchange rates and other information. The tables fro the exchange rates will store exchange rates fro all currencies. Can I have any suggestions about the number of tables to use for the exchange rate? I think I will need at least 2 tables, but I am looking for suggestions on how to achieve maximum speed when querying the database and also avoid redundant tables or rows. Mimi -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=pchap...@nc.rr.com -- Distributed Computing stats http://stats.free-dc.org -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
starting multiple instances with mysqld_multi
Hi, I am exploring multiple instances with MySQL which will be running using the same set of binaries (single MySQL base). Two things which I'm not able to work out are - 1. Why mysqld_multi stop grp_id doesn't work? Well, I know why it doesn't because there is nothing in the script to handle a 'stop' call; the actual question would be - why it doesn't work when it is mentioned in the MySQL reference manual? 2. how to (auto) restart the instances after a server restart? do I need to write my own script for this or is there anything available which I'm not aware of? If you have resolved these issues, please let me know. Best Regards, Nitin
