Transaction Timeout For Data-base Mutex
I'de like to use transaction locking mechanism as a mutex. I've already succeeded making this work on pgsql.
The algo is simple: I open a connection, set lock timeout to whatever i want, start the transaction and try to update a dummy row or create a dummy table (P/semTake of mutex), check if I got the mutex token (affected rows > 0 on update, no error on create table) (if not exit), execute my critical job and finally close the data-base connection causing a roll-back on update or create table (V/semGive of mutex).
with MySQL, I haven't found anything to modify the lock timeout. Does someone know?
View Complete Forum Thread with Replies
See Related Forum Messages: Follow the Links Below to View Complete Thread
Timeout Transaction InnoDB
I have a application with invoice and invoice_items, but i need used transaction to save records. If only user save data this fine. But if two users save data same time, one users save correctly and another user go to rollback directly, if second user save data again this ok. InnodBd Documentation have a timeOut transaction = 50 Secs. But, the application save all records in about 2 secs. The sintax is the next: Code:
Error : Lock Wait Timeout Exceeded; Try Restarting Transaction
i am trying to create a java application using mysql but if i try to create multiple connections, i keep on getting this exception given below. I have read about the TransactionDeadLockDetectionTimeOut option but i am neither able to find config.ini nor i am running the cluster for which this option applies. Code:
Recreate Data-base?
if i build a temprorary DB on my server for a clients site while i create it. is there someway i can make the DB give me a creation code that i can give to the client to re-create my entire temporary DB?
Restore To New Data Base
I am using a heavily modded PHPBB forum and want to convert all my posts, users, etc, into a new PHPBB forum using some other mods. I am using MySQL 3.23.58 . I ran the conversion steps as the creator fo the modded forum stated but at the point where I run the install.php page I get an error that says "installation aborted as table xxxxxx already exists." Is there a way around this like perhaps makign the new tables over write the old tables? I need to keep the tables as they are or I will lose the posts and such.
One Big Data Base Or Many Smaller Ones
I am creating an on-line course and would like to know if it will make a difference in the way I set up my database(s). Option 1 : Create one large Database for the course Here I would prefix the tables with their functions, ie. reg_ quizzes_ forum_ etc. Option 2 : Create a smaller Database for each function Here I would create a registration database, a quizzes database a forum database etc. I do not have my own server, so I would have to get my ISP to create each database, which might be a hassle for them.
Data Base Transfer
Im trying to learn if it is possible to transfer data from one mysql to another with a diferent structure ie different table names etc am I beating my head against a brick wall? .... its thick enuf.
LINKs For A Data Base
I am trying to create a database that have email addresses. I would lie it so that when some one clicks on the email address, it would open up the email ( mailto:xxxx.xxxxx.com) , yet I want it to display as xxxx.xxxxx.com (as a hyperlink) The above answer might answer the next quest, but if not please advise on it as well. I would like to create a link to a different page in a table (pictures of people), again, this should be a hyperlink.
Transfer A Data Base To My Site
i've create a data base with phpmyadmin in my computer and now I want to put it in my site...it's possible to do it? And how?
Access Intranet Data Base
I have a db in my intranet, and I need to access the information from my web site which is hosted somewhere else (internet). Whats the best way to do this? Should I use a public IP for my intranet server? (then theres no point on hosting my web site some where else right?Could I syncronize both MySQL data bases?
Transforming Sql Server Data Base To Mysql One ..
I have an sql server Database Backup , I got it from My client who wants to rebuild his site with php-mysql . What i want to do is to transform the sql server backup to MYsql one without losing any data .. I want to do this without Loading the sql server on my PC ... i tried many tools but it requires a pre-installed version of sql server to connect to .. I have the sql server bckup file with the name website.bak
Moving Data Base From / Var To Home Directory
I'm successfully running MySql under Debian with the data files in /var/lib/mysql. I would like to move the data base files to my home directory and have mysql use them from there. How do I do it? Can I just copy them to my home directory and start mysql with a parameter which point to the new locaion? Can I do that with mysql starting at boot time? I just looked at /etc/init.d/mysql and see that it appears to starts mysql by calling /usr/bin/mysql_safe but there is no such file. As an alternative to putting it in my home directory, I would be happy putting the files in /usr/local. Can I do that without rebuilding mysql? The reason I want to do this is that I want to install a new version of Knoppix and that will format and clean out the / partition and I don't want to loose the data I have in /var/lib/mysql. Could I just save /var/lib/mysql and restore it after installing the new version of the system?
How To Change Read/write Permission On Mysql Data Base.
I had a total crash and the server guy gave me all my data in a hand basket.. just kidding.. Actually I was given the data all zipped up and the mysql data bases were separate and they were the direct downloads as follows: wp_comments.MYD wp_comments.MYI wp_comments.frm all data was in this format. I used SSH and uploaded it to the proper directory on the server and all is well at least as far as visitors seeing all the data.. but when I log into the site I get the following... WordPress database error: [Table 'wp_options' is read only] UPDATE wp_options SET option_value = 'O:9:"magpierss":18:{s:6:"parser";i:0;s:12:"current_item";a:0:{}s:5:"it ems";a:10:{i:0;a:12:{s:5:"title";s:13:"WordPress 2.2";s:4:"link";s:54:"http://wordpress.org/development/2007/05/wordpress-22/ I used SSH and tried to change the concerned files to writable and it works fine but the same error is generated. I can go direct to the data base using myAdmin and cannot edit (write) to any table. It says the data base is read only. On the same mysql area, I have another data base that was done via the normal way and I can write to it just fine. I can find nothing to change to make the site writeable. Any help here would be greatly appreciated.. SSH to the server and changing the files to writable has no effiect..
Querying For Transaction Totals And Last Transaction Date
I have a list of currency transactions made by users. I need to generate a list of users along with their transaction total (sum for each user) AND the date of their last transaction. Sound doable? MySQL 4.1 Data looks like this: user, amount, date ============== 1, 50, 2003-11-23 2, 34, 2004-10-04 3, 45, 2005-08-30 3, 98, 2006-04-02 3, 76, 2000-02-03 2, 91, 2000-12-04 1, 11, 2003-11-05 3, 22, 2003-03-06 4, 34, 2006-03-07 5, 45, 2006-06-24 I figure I can group by userID but how do I get the date of the most current transaction? Using the data above, the query would return: 1 (user) 61 (subtotal) 2003-11-23 (last transaction) 2 (user) 125 (subtotal) 2004-10-04 (last transaction)
Timeout
I am working with program that reads/writes to a mysql database. After 28800 secs of inactivity the connection is lost. Is there a way to set this timeout to unlimited?
First Base
I'm trying to follow some simple instructions but I just can't seem to get anywhere. I'm running it through XP, I've installed it and can get into winmysqladmin no problems at all. It didn't ask me for a password or anything when I started which some of the books suggested. I set up a user s_roper with a password and went into the command prompt to create a database. I typed in the username and password and it was all correct but it just keeps saying access denied. I set up the root user and set a password for that but it keeps saying the same :access denied for user: 'root@localhost' <using password: Yes> So I decided perhaps I'd done something wrong so I removed it and started again but it seems even when I remove it it still holds the passwords and users.I'm completely stuck.
Need Query To Timeout
I've been using MySQL successfully for a few years but just recently ran into a situation where I need a query to timeout in 30 seconds even if it is not finished. I can't seem to find how to change the Timeout period for a query.
4.0.15 Lock Timeout
I'm running the same application on 4.0.1-alpha-win and 4.0.15-win. Under 4.0.15 I run the same test client as I run against 4.0.1-alpha-win. The behavior is different. In particular, 4.0.15 produces a "Lock wait timeout exceeded; Try restarting transaction" which does not occur under 4.0.1-alpha-win. All tables are innoDB. No "SELECT...FOR UPDATE" is being done. transaction isolation level is SERIALIZABLE. Many Selects go through. The first update hangs, then I get the lock timeout exception. I don't think the behavior is correct since this code works fine under 4.0.1. Has anyone else seen unexplained waits on update? If I had done a SELECT...FOR UPDATE, then I could understand that the wait might be caused by an uncommitted transaction that performed the SELECT...FOR UPDATE.
Connection Timeout
I keep getting a 2013, after querying mysql I see that my connection timeout is 5. I think, as a windows user I need to set my connection timeout to 1 year.
Connection Timeout
I've made a small script in PHP which makes a single connection and then processes a huge list of short strings and sends each to a remote server. The thing is, after some time (8 hours I think) the script just stops and from what I've read it seems mySQL terminates connections made 8 hours ago. How can I fix this?
Session Timeout Issue
I'm trying to import several million records into MySQL but the darn thing keeps going to timeout before all of the records are imported. How do I change this setting? I'm using the command line and am very confused.
ODBC Connection Timeout
Hope someone can help me with ODBC connection error I'm having. Have installed mysql 5.0.12 beta-nt and ODBC 3.51.12 on XpPro sp2 machine. I have configured the driver and all works well untill I activate Norton Internet Security. If this is enabled and I use the ODBC configuration tool to test the connection I get the following error; [MySQL][ODBC 3.51 Driver]Lost connection to MySQL server during query Windows firewall is turned off and Norton has been configured to allow MySQL. Is the Norton thing a red herring .
MYSQL ODBC Timeout
I have a simple MS access 2K form to update a MYSQL table. If it sits for about 5 minutes I assume it timesout and reports a ODBC Call failed then Object invalid no longer set..no current record.. If I close the form and re-open I'm back in business.. Can anyone tell me if there is a registry setting or something to get around this issue
Alter My Timeout Setting
i have a rather long script that makes several connections to a MySQL database. Sometimes , if there is a problem with the script, or a bug in my code, or something else unexpected, the connections dont get closed. Is there a way that i can set MySQL to percieve when a thread has been idle for like 5 minutes and kill it for me? Like a timeout function. i have googled and searched around here, but i am having trouble finding out just where to do this.
/var/lib/mysql/base-bin Files?
I run a hsoting company and we have a dedicated server. Our server details are at below: OS: CentOs 4.5 Recently I have discovered server disk usage is getting bigger with no reason. I have googled the issue and find out exim temp files were getting very big. I have deleted them. Also I have figured out /var/lib/mysql/ directory is another large directory. In the directory there are base-bin files. Can you tell what these base-bin files for. I do not think they are neccessary for server but I did not want to delete them without knowing what they really are.
Subquery Error Causing Timeout
I'm going to pose a general question (first) rather than post my query: I have this query which normally runs fine but yesterday just ran on and on. It ended up timing out 8 hours later (the default, it seems - but I will change that) When I EXPLAIN the query it tells me that a subquery returns more than 1 row. Which is fine and I have amended the query. But in that case shouldn't the query have failed, rather than running for 8 hours? Oh, and why would the query show as sleeping in SHOW PROCESSLIST?
Timeout Problem (windows Client)
I'm developping with php/mysql a web application for database managing and my problem is the following : When I navigate throught my pages everything is ok but if I'd been inactive for a couple of minutes and I can't navigate anymore and my browser (IE and firefox have been used for this test) inform me that there's no databases selected. I use sessions in my web application and I thought it could end but I check my parameter and the time session is infinite. Do you think the problem come from default timeout?, how do I change its value ? (I work with easyPHP (Apache 1.3.33, PHP 4.3.10, mysql 4.1.9 )
Lock Wait Timeout Exceeded
I am getting this error when updating a row. I am using mysql 5.0.16nt version. mysql> update my_sys_seq_no set curr_val=10 where key_col_nm='role_id'; ERROR 1205 (HY000): Lock wait timeout exceeded; try restarting transaction
Anyone Using OpenOffice BASE As MySQL Frontend?
I recently saw OpenOffice's Base: "BASE enables you to manipulate database data seamlessly within OpenOffice.org. Create and modify tables, forms, queries, and reports, either using your own database or BASE’s own built-in HSQL database engine. BASE offers a choice of using Wizards, Design Views, or SQL Views for beginners, intermediate, and advanced users ... For more advanced requirements, BASE supports many popular databases database natively (Adabas D, ADO, Microsoft Access, MySQL)" I' am interested to hear anyone's experience with using this as a tool, development tool, or front-end builing tool for MySQL apps.
Views And Altering Base Tables
I want a view that contains all the colums of the base table but only the rows where the index "owner" is a certain value. Easy enough CREATE VIEW bt_42 AS SELECT * FROM bt WHERE owner=42 This seems to me to be easier, quicker, and more maintainable than enumerating each column and it seems to work. Now the question is if I happen to add another column to bt will that automatically be reflected in all views that were made by SELECT * ? Seems like it should, since updates to other columns of bt would be reflected in bt_42
Occasional Apache Timeout When Using Mysql, Windows
I have the most up to date versions of apache, php and mysql on my windows machine. Sometimes, when I run php scripts that use mysql I get an apache timeout. This happens only occasionally, not at any specific circumstances I can re-create. There is no mysql or php error, but it happens ONLY with scripts that use mysql.
Delete From Multiple Tables Base On 2 Values..
.. the title pretty much says it all. My experimenting led to two of my tables being dropped so, i'm looking for some help! i need to delete from 3 tables but only the row in each table that has the user column and pic column equal to the values i pass it. I hope my problem description is clear enough.. let me know if it's not!
Lock Wait Timeout Exceeded How To Find The Source ?
I am running an application using Innodb. My application is based on transaction concepts. So sometimes I do get this error of "lock wait timeout exceeded" ? I know this is due to some deadlock. But how and where can I analyse to see what is the cause to my this locking problem and how can I overcome this ? Thanks.
Error On Insert: Lock Wait Timeout Exceeded
I've got 6 Java client applications (running on 6 different PC's, including one of them on the database server) reading data from a flat file and inserting data into a table on my database: [root@appserver2 mysql]# mysqld -V mysqld Ver 5.1.12-beta-log for unknown-linux-gnu on x86_64 (MySQL Community Server (GPL)) There are total about 12 million lines of data to read from these flat files and INSERT into a Innodb table on the database. Each client application has 20 threads running which run some validation code on the record and then perform the insert. I have not exceeded my max_connections. Around insert number 450,000 all of the clients started getting the following error: Exception in Processor.DataArchiveInsert, trying to insert into data_archve, e: java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction and also: Processor.ProcessData(), error inserting claim : java.sql.SQLException: Lock wai t timeout exceeded; try restarting transaction The java code for Processor.DataARchiveInsert is: Code:
Log Transaction?
Log Transaction Does MySQL has Log Transaction If not what will be the better way to make a backup of the database with log out the users.
MySQL 4.0.18 On Dual AMD64 Opteron Causing Thread Zombie Even When Timeout Is Set To 60 Seconds
We have a problem with Dual AMD64 Opteron/MySQL 4.0.18/Mandrake 10 for a very high volume site. We are evaluating the performance on our new server AMD64 and it seems it's slow compared to Dual Xeon/MySQL 4.0.15/RedHat8 and Dual Xeon/MySQL 4.0.18/Mandrake 10. And it seems there are zombie threads. 570 threads in 1 hour and we didn't even use JDBC connection pooling at all. These threads are supposed to be gone within 60 seconds, since we set that option in mysqld. Note that we run many SELECT queries (can be up to 150 queries/seconds), but the system does not indicate any slow query: it's 0! Our configuration is Apache 2.0.48 + Tomcat 5.0.27 + MySQL 4.0.18 with MySQL connector/J 3.0.14 (latest stable). The Redhat 8 runs on Apache 2 + Tomcat 4.0 + MySQL 4.0.15. The old Redhat 8 on Xeon was fine. We have another machine running Mandrake 10 on Xeon and they were fine under the same load. I have set the wait_timeout to 60 seconds, and it appears to be fine within 10 minutes, all the threads that are in "sleep" mode disappeared after 60 seconds. After a few minutes though, it's back like it was before. Is this Mandrake problem? MySQL problem? I read in here than Mandrake win hands down on AMD64 compared to FreeBSD. Code:
Transaction And Two Tables
a little confused about transactionts on Mysql. I have such situation: Two different tables, I need to add many rows to the first table and after those rows are added I need to add one row to the second table... My question is how do I use transaction on two tables at the same time (no problems when dealing with just one table), because it's needed to success on all queries to both tables, if one fails, then rollback to starting point.
Function Transaction
I'm working on a little framework based on SQL, i'm fighting with session becouse i'm need to check if the user is login or not and then if can see the resource or not, it's can be change for each resource. Code:
START TRANSACTION
After START TRANSACTION but before COMMIT, are intervening SQL transactions visible to other threads or processes? I understand that failing to perform a COMMIT, or explicitly performing a ROLLBACK, results in the transactions occurring after START TRANSACTION being undone. But until and if the transactions are undone, would queries to the database reveal those transactions?
Transaction Processing
When doing an update in mysql in a multi-user session eg webpage/php/mysql , how do i have transaction locking on tables. As required data is being updated i don't want other users accessing it?
Transaction Control
I am a recent user in mysql and I'd like to know if I need control the transactions in java when I am using mysql. I am asking it because I have read the mysql already control the transactions automatically, that is, it automatically control the commit and roolback commands.
How To Implement A Transaction
I want to implement transaction mechanism. Think about world document each change saved in a temporal workspace and at the end the user can press on save and the changes apply to the original document or close and the document will not be changed. My client can do a lot of changes to the configuration we need to save this changes in a temporal workspace (in order to mange the relation between records ... and in order to prevent lost of his work in case that the client crash) At the end (he can do the changes for a week) he can choose apply changes that will merge those changes to the configuration or cancel. So, i need to implement here something similar to transaction (i can use transaction because the client can do changes for a week). does any one have an idea on how transaction implemented in DB?
Transaction Logging
I am reading up on transaction logging, and am wondering whether MySQL's binary log is its "UNDO/REDO log"? I'm a beginner to all this, and not sure whether that's the correct interpretation of the MySQL binary log. How does MySQL's transaction logging, or any transaction logging mechanism, work? I was reading up on general transaction logging principles but it was getting far too specific to SQL Server and other DBMSs, so I figured that I could come here and someone here might point me to some MySQL-specific resources on this, or perhaps help to explain how this all works. e.g. Does the transaction log get rid of all transactions once committed, what's the difference in how UNDO and REDO logs work, are these logs stored in a more complex manner than just logging the plain text statement (I'd imagine so, because otherwise how would an undo operation work)? In fact, I find it funny that I'm asking all the questions above because I'm still not quite clear on what the purpose of transaction logs is in the first place! While it would be great if somebody could help clear up the confusion I'm having, it would also be good if you could point me to some MySQL-specific resources on this topic. I browsed through the MySQL documentation and did a web search, but either did not find any resources period, or did not find resources that "dumbed it down" enough for me.
Transaction Performace
Im going to develope a massive website that going to handle morethan 10,000 transactions perminute(my Assumption). Is it possbile with MySQL Database to Handle 10,000 concurrent Users? Will MySQL take this much of load?
|
TRACKER
