Compare two tables
Hi: I need to compare the structure of two tables (fields, field types, field lengths, indices, etc.) to determine if they have the same schema, even if the fields may be in a different order. Is there a command in mysql that will do this? This will be used to determine if the tables are basically the same, or if they need to be upgraded based on the table structures of a central office. Thank you. -- Alfredo J. Cole Grupo ACyC -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Compare two tables
El Viernes, 26 de Agosto de 2005 08:16, Martijn Tonies escribió: You could check the table DDL. Or use a third party tool, like Database Workbench, that can do this for you and even generator a change script. Check www.upscene.com With regards, Martijn Tonies Hmmm. No Linux version. Thank you anyway. -- Alfredo J. Cole Grupo ACyC -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Compare two tables
El Viernes, 26 de Agosto de 2005 08:56, Gordon Bruce escribió: If you have the 5.0.x version of MySQL then INFROMATION SCHEMA can give you what you want. i.e. SELECT a.*, b.* FROM INFORMATION_SCHEMA.COLUMNS AS a INNER JOIN _SCHEMA.COLUMNS AS b ON (a.column_name = b.column_name) WHERE a.TABLE_NAME = 'foo_1' AND b.TABLE_NAME = 'foo_2' If you look up INFORMATION SCHEMA in the documentation you will find the table definitions to chose the columns you need for your comparison. 21. The INFORMATION_SCHEMA Information Database 21.1. INFORMATION_SCHEMA Tables This is very interesting. I'm using 4.1.12 as it is the stable version, but I will keep an eye on version 5. Thank you. -- Alfredo J. Cole Grupo ACyC -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Accessing a MySQL server from PocketPC
Hi: I would like to use the DALP libraries (http://solutions.mysql.com/software/?item=145) to access a MySQL server 4.1.10 on Linux, from my PocketPC (iPAQ 3100 WM 2003 SE). I would appreciate it if somebody could provide me with a minimal sample that would just connect to a database so I can see what headers need to be included and what libraries to link, using eMbedded VC4 and Windows 2000. Thank you and regards. -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom - www.acycdomains.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Develop an application
El Lun 14 Mar 2005 14:59, Stephen Andert escribió: Hi there, I searched the archives, but didn't find anything helpful. I am trying to build a fairly simple application for contact management. I already have what I want built in MS Access, but I need this application to run on Linux. I did some searching and Rekall looked like a good tool. Had a hard time getting configure to work and now make is not working right. Does anyone have any recommendations for a simple tool for developing applications in a Linux world? The machine in question is currently RedHat 9 and I'm not really interested in changing that right now. (...) You can try OpenOffice.org. Regards. -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom - www.acycdomains.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
How to determine how many ibdata files are needed?
Using MySQL 4.1.10, SuSE 8.2 Pro, reiser file system. Hi: I have been trying to locate a reference which would provide guidelines to determine if one ibdata should be used, or when to use several (two, three, etc.), but I can not seem to find anything in the manual. I have tried a single ibdata file for my 5 Gb database (which is going to grow as history gets added to it), two and even three ibdata files, the last with the autoextend argument. I have not seen a difference in performance so far. Is there any advantages to having one single ibdata file, or is it better to have several, and if so, how many? If you could point me to a url where I can read about this, I would greatly appreciate it. Thank you and regards. -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom - www.acycdomains.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Switching to InnoDB turns out dissapointing
El Mar 01 Mar 2005 18:29, Heikki Tuuri escribi: Alfredo, I have changed my my.cnf to try and include the suggestions from the list, as much as possible and try to run my program again. It now reads like this: innodb_data_file_path = ibdata1:2G;ibdata2:2G:autoextend set-variable = innodb_buffer_pool_size=256M set-variable = innodb_additional_mem_pool_size=32M set-variable = innodb_log_file_size=64M set-variable = innodb_log_buffer_size=8M innodb_flush_log_at_trx_commit=1 set-variable = innodb_lock_wait_timeout=50 The MyISAM database is 1Gb in size, and the resulting InnoDB table space is 4 Gb. In my laptop (I have to test here before I decide to implement in the server), the time has dropped from 4 hours to 70 minutes. With MyISAM tables, it takes 12 minutes. Although the reduction in time is substantial, I still think it should be better. InnoDB is supposed to provide transactions and row level locking, which I need to improve concurrency, without compromising the speed of MySQL. We have other processes that need to be run on a weekly basis that do a lot (45,000 records need to be examined) of select sum() for a one year period, from a table with 1 million+ rows and then updates a table with 800,000 rows, and so far it takes around 12 hours, even after enclosing between BEGIN and COMMIT statements. Could be entirely our fault. Have to check that too. Will try with this new setup and see how it goes. Thank you all. -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom - www.acycdomains.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Switching to InnoDB turns out dissapointing
El Mié 02 Mar 2005 11:41, Brent Baisley escribió: Coming in late on this thread. The testing on your laptop, are you just running the one query or are you somehow emulating the typical load you are trying to design for? As you said, you are trying to improve concurrency, so you'll need to compare MyISAM and InnoDB setups under load (i.e. the weekly run+typical activity). If the concurrency you are trying to improve is caused by your weekly runs, I would try doing replication. Your summarization queries would run against the replicated machine and create a text file for batch import/update into the table you need to update. That way you remove the load from the main machine caused by the summary queries. Thank you, Brent. Actually, there are three servers involved, all with a similar configuration: Server 1 - 2 Xeon 2.4 Ghz HT with 4 Gb RAM and three 36 GB SCSI HD's 10K in RAID 5 holding the main database. Uses a openMosix kernel. Server 2 - Identical config used for replication. All selects are run against this server. Server 3 - Same config except for 8 Gb RAM. Acts as an application server running the ERP software and acting as connection via a NX server for 200+ users. The servers must be available on a 24/7 basis, and are never brought down except for routine maintenance, at which time their roles are switched temporarily. Running the application that updates database structures, when needed, must be done before 7:00 am because customers begin to come in at 8:00 am, and should not last for more than 30 minutes. We are using MyISAM tables and they have to be locked when beeing updated by concurrent users, like salesmen invoicing customers in real time (it's a hardware store/True Value convenience chain of 9 stores all running our server-based ERP). We have setup another database and parallel version of our ERP software with InnoDB tables for testing, and we are encountering this problem. With MyISAM tables, locking them causes some terminals to wait for up to one minute at peak hours, which seems like an eternity when a customer is waiting for his invoice to go and pay, get his merchandise and leave. This we are hoping to improve with row level locking. Inventory, AR, GL, etc. are updated in real time. However, statistics such as history sales, sales forecasting, average discounts, profit margins, EOQ, DRP, etc. are calculated on a weekly basis moving the period to always hold a year's worth of data, using something like: select sum(sales_value) from invoices where invoice_date=datesub(now(), interval 12 month) The total items in inventory is 45,000 and the invoices table has about 1 million rows. The system was started January 2004. In my laptop I can only run single processes, but that's where I test before making software, data, and configuration changes in the servers. Compiling changes to the software (our own ERP) must also be made in my laptop, turned into an rpm file and then installed in the application server (Server 3). Best regards. -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom - www.acycdomains.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Switching to InnoDB turns out dissapointing
El Mié 02 Mar 2005 16:04, escribió: H, sounds like you are trying to mix OLTP and OLAP in one database structure. That's a tough one. You want your tables designed to always accept data in real time, but once the data is in, it doesn't change and you want to query it. Relational vs. Dimensional data models. Your hardware is pretty good. Sorry, I missed the early thread responses, did you figure out where things are bottlenecking (CPU, Disk I/O, RAM, Network)? That will help you focus on what you can change in your software if you can't upgrade your hardware. The first place to always look is your queries. Optimizing your queries always gives you the best bang for you buck. Use explain to make sure MySQL is using the right indexes, especially since you are using date ranges. Sometimes MySQL may use the best index, sometimes it won't, simply by changing the date range. It won't hurt to use hints (USE, FORCE, IGNORE) in your query if you know you want MySQL to use a certain index. You could possible also change you structure slightly, like add a WeekNumber column. It could just be an incrementing week number with 1/1/2004 being week 1, 1/1/2005 being week 53, etc. So it would be weeks since 1/1/2004. It could be just a regular int type, which should be quicker than searching on a date field. The idea is to add constants on entry to speed up the summaries. Also, try to eliminate any and all calculations from your query, like replace datesub(now(), interval 12 month) with a constant. Which means figuring out the right date before hand. Would you be able to run daily summaries? Then your weekly summaries are just running against 7 records. 1 million rows is not that big, so you should be able to get good performance, it's just a matter of structuring things correctly. Heck, it may end up that the best thing to do is an insert select into another table (maybe even a temp table), which you then run your summaries against. Since your dump is sequential access to disk (the same order the data was entered), it may be very quick. After some thought, and seeded by the many fine suggestions from the list, I decided to restructure completely the approach to the problem. The result is that the query to calculate one variable now takes only 7 minutes! We will go on and restructure the remaining 10 variables and see how it goes. Sometimes, not working makes you more productive ;-) Thank you all and best regards. -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom - www.acycdomains.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Switching to InnoDB turns out dissapointing
Hi: I have switched from MyISAM tables to InnoDB, using MySQL 4.1.10 under SuSE 8.2. My application, an ERP system developed in-house, uses 70 tables, the largest one holding a little over one million rows. To assist when changing table structures, we developed a software that creates a new table for each of the 70 tables, one at a time, using the new structure, copies all of the records from the old table to the new one, drops the old one and renames the new one. Using MyISAM tables, this process takes 10 minutes using a two Xeon 2.4 Ghz server, with 4 Gb RAM and SCSI RAID 5 disks. The same system takes 2 1/2 hours using InnoDB tables with the same configuration. We have followed the guidelines for tuning the server, and still, we find this to be excessive. Can somebody point to some docs, guidelines or web sites we can consult to improve InnoDB's performance? It seems inserting many rows decreases performance significantly. Thank you and regards. -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom - www.acycdomains.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Switching to InnoDB turns out dissapointing
El Mar 01 Mar 2005 17:32, Gary Richardson escribió: What have you actually done to 'tune' the server? How are you doing the inserts? InnoDB uses transactions. If you are doing each row as a single transaction (the default), it would probably take a lot longer. I assume you're doing your copying as a INSERT INTO $new_table SELECT * FROM $old_table. Try wrapping that in a BEGIN; INSERT INTO $new_table SELECT * FROM $old_table; COMMIT; How do you have your table space configured? Just some random thoughts.. This is the InnoDB related stuff from my.cnf: innodb_data_file_path = ibdata1:10M:autoextend set-variable = innodb_buffer_pool_size=192M set-variable = innodb_additional_mem_pool_size=32M set-variable = innodb_log_file_size=5M set-variable = innodb_log_buffer_size=32M innodb_flush_log_at_trx_commit=0 set-variable = innodb_lock_wait_timeout=50 I am using the syntax as you describe it. In my notebook, with 512M RAM, it takes 4 hours to complete. The top command says mysqld is using about 8% of CPU, so it must be a disk problem. Funny thing is, it did not show when the tables were MyISAM. Thank you and regards. -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom - www.acycdomains.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
mysql-query-browser and SuSE 8.2
Hi: I have not been able to find a precompiled version of mysql-query-browser for SuSE 8.2, either at mysql web site, or using google. Compiling from source fails because of version differences in libxml-2.0, for instance. Anybody know of a URL where I can find a version that will work with SuSE 8.2? Thank you. -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom - www.acycdomains.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
MySQL 4.0 and concat
Hi: I have a problem in that all statements that include concat execute very slowly. For instance, if I have three fields in string format that represent a year, month and day, and want to issue a select like: select * from cxcmanpag where contact (year,month,day)=stringYear+stringMonth+stringDay (simplified), then it will take a long time, againts a table with only around 100,00 records. If I rewrite the statement to read: select * from cxcmanpag where year=stringYear and month=stringMonth and day=stringDay, it will execute considerable faster, but will not produce the same results. I have looked in the manual, and also read High Performance MySQL from Zawodny and Balling, and MySQL from Paul Dubois, but none of them seem to address this issue. Can somebody point me to a URL or book that I should be reading to improve, this, or how to avoid using concat altogether? Thank you. -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Fwd: Re: MySQL 4.0 and concat
Sorry. This should have gone back to the list. -- Mensaje reenviado -- Subject: Re: MySQL 4.0 and concat Date: Lun 11 Oct 2004 11:37 From: Alfredo Cole [EMAIL PROTECTED] To: [EMAIL PROTECTED] El Lun 11 Oct 2004 08:35, escribió: Have you considered NOT comparing dates as strings but rather as date values? That will avoid the use of CONCAT() completely. I will try this. But there will always be times when using concat might be required. It would be nice to know if there is a solution to the concat problem. Thank you, and regards. -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom --- -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
temporary tables and replication
Hi: I'm using MySQL 4.0, and have setup replication with one server and one slave, both running LM 9.1. My application creates a temporary table on the master, which is supposed to be deleted when the connection is closed. When that happens, replication stops with the following message: ERROR: 1051 Unknown table 'tmpclisal' 040831 20:16:38 Slave: error 'Unknown table 'tmpclisal'' on query 'DROP /*!40005 TEMPORARY */ TABLE truepos.tmpclisal', error_code=1051 040831 20:16:38 Error running query, slave SQL thread aborted. Fix the problem, and restart the slave SQL thread with SLAVE START. We stopped at log 'central-bin.001' position 12475966 Is there a problem in using temporary tables and replication? I have not found any clues in the manual. If there is a problem, perhaps someone can point to a url where I can find a solution? Thank you. -- Alfredo J. Cole Grupo ACyC www.acyc.com - www.clshonduras.com - SolCom -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Help, slave wont stay running!
El Jueves, 12 de Agosto de 2004 09:22, matt ryan escribió: I cant keep the slave up for more than 10 minutes constantly getting these errors 040812 10:32:25 Error reading packet from server: binlog truncated in the middle of event (server_errno=1236) 040812 10:32:25 Got fatal error 1236: 'binlog truncated in the middle of event' from master when reading data from binary log 040812 10:32:25 Slave I/O thread exiting, read up to log 'FINANCE-bin.185', position 284963878 I had a similar situation one week ago. Found one of the tables (MyISAM) had a corrupt index. After fixing it, everything was fine again. Regards. -- Alfredo Cole Grupo ACyC www.acyc.com - www.clshonduras.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Using MySQL and OpenMosix
El Vie 07 May 2004 00:20, escribió: (...) My knowledge of OpenMosix is extremely limited. I've not heard of anyone successfully using MySQL with OpenMosix for fail-over. That doesn't mean it hasn't been done, but it'd be news to me. I assume you've also asked on the relevant OpenMosix list(s). One would hope they'd know. But maybe not. Jeremy This is the reply I got from Moshe Bar (OpenMosix developer): *** Even if threads of an application can't migrate, other processes (which eat up resources away from the application in question) can migrate away and therefore speed up the application. I can't stress enough that it is not the migration that speeds up the applications, it's the load balancing that increases throughput. Moshe *** So there may be hope. I will setup two computers with OM next week and see what I can do with them. Thank you and regards. -- Alfredo J. Cole http://www.acyc.com http://www.clshonduras.com [EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Using MySQL and OpenMosix
Hi: I would like to add an identical server to the one I already have: Double Xeon processors, 4 Gb RAM and RAID 5 (Hardware) HD's. I would also like to cluster them using OpenMosix, but I'm told that MySQL 4.0 will not take advantage of the cluster. Is there a way to cluster MySQL so that queries will migrate to the new node when needed? Is there any docs I could dig into to see if this can be done? Books, how-to's? Any help would be appreciated. Thank you. -- Alfredo J. Cole http://www.acyc.com http://www.clshonduras.com [EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Using MySQL and OpenMosix
El Jue 06 May 2004 11:05, escribió: On Thu, May 06, 2004 at 06:55:38AM -0600, Alfredo Cole wrote: Hi: I would like to add an identical server to the one I already have: Double Xeon processors, 4 Gb RAM and RAID 5 (Hardware) HD's. I would also like to cluster them using OpenMosix, but I'm told that MySQL 4.0 will not take advantage of the cluster. Is there a way to cluster MySQL so that queries will migrate to the new node when needed? Is there any docs I could dig into to see if this can be done? Books, how-to's? At the time I wrote Chapter 8 of High Performance MySQL, I tried to discuss the available options: http://www.oreilly.com/catalog/hpmysql/toc.html However, some of the commercial information was hard to come by, so if you're looking at those, you may need to discuss with the vendors too. Jeremy Jeremy: I have ordered your book from Amazon.com. But I am not planning to use a commercial solution. I want to use OpenMosix, which is released under the GPL. Any suggestions would be welcome. Thank you. -- Alfredo J. Cole http://www.acyc.com http://www.clshonduras.com [EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: MySQL 4 goes to sleep with table locks?
El Sáb 07 Feb 2004 02:28, escribió:
Mr. Alfredo
Pls, will you give the complete structure as 'create query' of your
database? that will help us to solve your problem.
Pradap
This is the structure of the table that holds the sequential numbers for
various documents that need them:
CREATE TABLE `invcorr` (
`empresa` tinyint(2) unsigned zerofill NOT NULL default '00',
`tienda` tinyint(2) unsigned zerofill NOT NULL default '00',
`ultfac` bigint(9) unsigned zerofill NOT NULL default '0',
`ultfaccred` bigint(9) unsigned zerofill NOT NULL default '0',
`ultconsig` bigint(9) unsigned zerofill NOT NULL default '0',
`ultdev` bigint(9) unsigned zerofill NOT NULL default '0',
`ultped` bigint(9) unsigned zerofill NOT NULL default '0',
`ulting` bigint(9) unsigned zerofill NOT NULL default '0',
`ultapar` bigint(9) unsigned zerofill NOT NULL default '0',
`ultcoti` bigint(9) unsigned zerofill NOT NULL default '0',
`ulttras` bigint(9) unsigned zerofill NOT NULL default '0',
`ultreq` bigint(9) unsigned zerofill NOT NULL default '0',
`ultajus` bigint(9) unsigned zerofill NOT NULL default '0',
`timestamp` timestamp(14) NOT NULL,
`usuario` varchar(20) default NULL,
PRIMARY KEY (`empresa`,`tienda`)
) TYPE=MyISAM;
The condensed extract of the C program tha does the locking is as follows:
SQLinst = lock tables invcorr write, invfacturas write;
state = mysql_query(connection, SQLinst);
if(state != 0)
{
wxMessageBox(mysql_error(mysql), Error:, wxOK |
wxICON_EXCLAMATION,
this);
wxMessageBox(_(Could not lock table!), _(Error:), wxOK |
wxICON_EXCLAMATION, this);
return;
}
SQLinst = select ultfac from invcorr where empresa='
+ sCodigoEmp
+ ' and tienda='
+ sFacTienda
+ ' order by tienda;
state = mysql_query(connection, SQLinst);
result = mysql_store_result(connection);
if(mysql_num_rows(result) != 0) // Tiene registros
{
while((row = mysql_fetch_row(result)) != NULL)
{
// Asigno valores
sFacDocu = row[0] ? row[0] : ;
}
}
mysql_free_result(result);
sFacDocu.ToDouble(dFacDocu);
dFacDocu++;
sFacDocu.Printf(%09.0f, dFacDocu);
SQLinst = update invcorr set ultfac='
+ sFacDocu
+ ' where empresa='
+ sCodigoEmp
+ ' and tienda='
+ sFacTienda + ';
state = mysql_query(connection, SQLinst);
SQLinst = unlock tables;
state = mysql_query(connection, SQLinst);
This final update is what seems to sleep and not react inmediately. The
application resides in one central server with dual Xeon 2.8 Ghz CPU's and 6
Gb RAM. All users run the application at the server connecting either via
ssh, VNC or Linux Terminal Server Project.
During the day, I will get 3 or 4 duplicate numbers per store. Given the fact
that reporting sales tax received, depends on a correct sequence of invoices,
my company could get into big trouble if authorities think we are trying to
avoid sales tax reporting.
Thank you for your help.
--
Alfredo J. Cole
[EMAIL PROTECTED]
[EMAIL PROTECTED]
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MySQL 4 goes to sleep with table locks?
I am using Mandrake 9.1 and MySQL 4.0.11 from the LM CD's. In my application, I have a table that stores the sequential numbers of invoices prepared by several stores. Every time a salesman prepares an invoice for a customer, the system goes to this table, locks it with lock tables table write, reads the number of the last invoice made for that store, adds one to that number, updates the field, and unlocks the table. In theory, I should never get a duplicate invoice, but in practice, I do. So, it seems that MySQL maintains, under some special circumstances, the same number and does not update it. Maybe there is a parameter in my.cnf I could change to make sure all updates are processed inmediately? Auto increment field would not apply in this case, since there is only one record per store that gets updated for every invoice. I would appreciate any advise. Thank you. -- Alfredo J. Cole [EMAIL PROTECTED] [EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Too many connections
I'm using mysql 3.23.55 and Linux Mandrake 9.1. I have about 60 users connecting to mysql using our accounting system. The users get some times a Too many connections error. I have set max_connections at 200, and the system opens only one connection per user at start up. Can somebody indicate where to look to calculate this value and eliminate this error? Thank you. -- Alfredo J. Cole http://www.acyc.com http://www.clshonduras.com [EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: select lock - How reliable?
El Jue 08 Ene 2004 19:56, Paul DuBois escribió: At 19:16 -0600 1/8/04, Alfredo Cole wrote: Hi: (...) The code I use is: select lock Sorry. It's select get_lock... get code add one to code write code release lock and select release_lock... That looks like pseudo code (There is no SELECT LOCK statement), so it's difficult to say what this should do. I have tried lock tables / unlock tables and it will eventually deadlock, even though the manual says it's guaranteed not to happen. That's right. If you deadlock with table locks on MyISAM tables, something odd is going on. But, given the nature of what you *appear* to want (get the next code in sequence), I'm curious why you don't just use an AUTO_INCREMENT column and use LAST_INSERT_ID() to retrieve the value. Is there something unusual about your requirements? I have not tried this. I was afraid that concurrency would in some cases cause it to return the wrong code. If two users access the table at the same time, which code would each one get? The one that the last user inserted, or the correct one for the first user, and so forth? Thank you. -- Alfredo J. Cole [EMAIL PROTECTED] [EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
select lock - How reliable?
Hi: I have an application that is used by around 40 users who need to access a table, obtain a sequential code, and write it back. I'm using MyISAM tables, and mysql 3.23 running under LM 9.0. A couple of times during the day, the users get the same code, and that is causing us many problems. The code I use is: select lock get code add one to code write code release lock I have tried lock tables / unlock tables and it will eventually deadlock, even though the manual says it's guaranteed not to happen. I would appreciate a suggestion as to where I can read more about locking tables / records using MySQL and My ISAM tables. Thank you. -- Alfredo J. Cole [EMAIL PROTECTED] [EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: Yet another server vendor inquiry
El Lunes, 8 de Septiembre de 2003 09:01, Michael Bacarella escribió: Names of vendors who are happy to provide servers applicable for high load Linux/MySQL. Willing to do custom configurations. Anyone? -- Michael Bacarella24/7 phone: 1-646-641-8662 Netgraft Corporation http://netgraft.com/ Finger email address for public key. Key fingerprint: C40C CB1E D2F6 7628 6308 F554 7A68 A5CF 0BD8 C055 Try: www.calforniadigital.com www.monarchcomputer.com Regards. -- Alfredo J. Cole http://www.acyc.com http://www.clshonduras.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Using MySQL with Mingw32
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hi: I'm using MySQL 3.2.3.39 for Win98. Has anybody been able to develop applications using Mingw32 compiler? If so, where can I get a version of the libmysqlclient library that will work with this compiler? Thank you. - -- Alfredo J. Cole http://www.acyc.com (Accounting Systems) http://www.clshonduras.com (Linux Hardware) PGP Key available from certserver.pgp.com -BEGIN PGP SIGNATURE- Version: GnuPG v1.0.5 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE8kOWAu5DxuPWE298RAss1AJ99zdbTZHb4Nlc6ED++J6WsQu9+UgCfX/vZ EB+WU6RiQYPZLVJot6s8oHw= =WMmW -END PGP SIGNATURE- - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
Re: [mysql] DBF a MySql
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 El Viernes 16 Noviembre 2001 08:23, escribiste: Hola a todos. Alguien tiene una herramienta para exportar tablas dbf a MySql? saludos Gastón Puedes usar dbf2mysql. Saludos. - -- Alfredo J. Cole Tegucigalpa, D. C., Honduras http://www.acyc.com (Accounting Systems) http://www.clshonduras.com (Linux Hardware) -BEGIN PGP SIGNATURE- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE79Sp1u5DxuPWE298RAiUeAJ9PKXAnrI2Kp0PMdxpm5S90jwIzkQCeOUwA htF9sy72pp63SeA3nd8Aq88= =BPxZ -END PGP SIGNATURE- - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
Re: About huge numbers
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 El Jueves 15 Noviembre 2001 13:15, escribiste: Gyulay Gabor wrote: The problem is that I need to store numbers with lot more than 16 decimal digits - e.g. 1234567890123456789012345.12 [...] The reason is why we need this that there're several currencies (like italian lire) which requires this kind of precision. Excellent answer from Carl. Generally, you don't want to store currencies in floating point, anyway, and it's unfortunate that MySQL implements DECIMAL as floating point rather than a variable-length BCD (which is exact). The manual defines DECIMAL as an exact numeric data type (page 141), since it stores the number as a string, preserving its exactness. How you manipulate this number inside your program is another story, and this may be the cause of confusion. I program accounting systems and always use at least a double. Unfortunately, BCD math is not available for all compilers (Borland is where I saw it last). - -- Alfredo J. Cole Tegucigalpa, D. C., Honduras http://www.acyc.com (Accounting Systems) http://www.clshonduras.com (Linux Hardware) -BEGIN PGP SIGNATURE- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE79ByQu5DxuPWE298RAg7wAJ0VEmTKBAqRR8id4P5GtTcujm4qwgCeNKnI mGE8Qs1eZUAMK1RuztZCvc4= =KRNI -END PGP SIGNATURE- - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
Re: foxpro conversion
El Miércoles 14 Noviembre 2001 09:00, escribiste: Anybody have any tools/tips for converting a foxpro database to mysql ___ Sean O'Donnell Try dbf2mysql. It works for me. -- Alfredo J. Cole Tegucigalpa, D. C., Honduras http://www.acyc.com (Accounting Systems) http://www.clshonduras.com (Linux Hardware) - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
Re: DBF to MySQL Problem?
El Martes 21 Agosto 2001 15:23, escribiste: Hello, I have downloaded your dbf2mysql-1.14.tar file from the MySQL.com site. I read through the README and still cannot seem to get this to work. Here is the error I'm getting: [info:admin/Desktop/dbf2mysql-1.14] root# make /usr/bin/cc -O2 -Wall -DVERSION=\1.14\ -I/usr/local/ mysql -c -o dbf2mysql.o dbf2mysql.c dbf2mysql.c:19: header file 'mysql.h' not found Do you the mysql-devel package installed? -- Alfredo J. Cole [EMAIL PROTECTED] Tegucigalpa, D. C., Honduras - Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail [EMAIL PROTECTED] To unsubscribe, e-mail [EMAIL PROTECTED] Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
