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  • How can artificially create a slow query in mysql?

    - by Gray Race
    I'm giving a hands on presentation in a couple weeks. Part of this demo is for basic mysql trouble shooting including use of the slow query log. I've generated a database and installed our app but its a clean database and therefore difficult to generate enough problems. I've tried the following to get queries in the slow query log: Set slow query time to 1 second. Deleted multiple indexes. Stressed the system: stress --cpu 100 --io 100 --vm 2 --vm-bytes 128M --timeout 1m Scripted some basic webpage calls using wget. None of this has generated slow queries. Is there another way of artificially stressing the database to generate problems? I don't have enough skills to write a complex Jmeter or other load generator. I'm hoping perhaps for something built into mysql or another linux trick beyond stress.

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  • MySQL on Windows - how do I set the wait_timeout for connections using named pipes?

    - by gustafc
    I use a MySQL database running on a Windows box, and for performance reasons I'm connecting to it using named pipes. The (Java) application using the database (through Hibernate) can let the connection lie idle for quite a long time, which causes the connection to fail with the following message: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 33 558 297 milliseconds ago. The last packet sent successfully to the server was 33 558 297 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem. autoReconnect unfortunately has no effect (and neither does autoReconnectForPools), but the wait_timeout docs state that wait_timeout only applies "to TCP/IP and Unix socket file connections, not to connections made via named pipes, or shared memory". How can I change the wait_timeout for named pipes?

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  • NetBeans, JSF, and MySQL Primary Keys using AUTO_INCREMENT

    - by MarkH
    I recently had the opportunity to spin up a small web application using JSF and MySQL. Having developed JSF apps with Oracle Database back-ends before and possessing some small familiarity with MySQL (sans JSF), I thought this would be a cakewalk. Things did go pretty smoothly...but there was one little "gotcha" that took more time than the few seconds it really warranted. The Problem Every DBMS has its own way of automatically generating primary keys, and each has its pros and cons. For the Oracle Database, you use a sequence and point your Java classes to it using annotations that look something like this: @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="POC_ID_SEQ") @SequenceGenerator(name="POC_ID_SEQ", sequenceName="POC_ID_SEQ", allocationSize=1) Between creating the actual sequence in the database and making sure you have your annotations right (watch those typos!), it seems a bit cumbersome. But it typically "just works", without fuss. Enter MySQL. Designating an integer-based field as PRIMARY KEY and using the keyword AUTO_INCREMENT makes the same task seem much simpler. And it is, mostly. But while NetBeans cranks out a superb "first cut" for a basic JSF CRUD app, there are a couple of small things you'll need to bring to the mix in order to be able to actually (C)reate records. The (RUD) performs fine out of the gate. The Solution Omitting all design considerations and activity (!), here is the basic sequence of events I followed to create, then resolve, the JSF/MySQL "Primary Key Perfect Storm": Fire up NetBeans. Create JSF project. Create Entity Classes from Database. Create JSF Pages from Entity Classes. Test run. Try to create record and hit error. It's a simple fix, but one that was fun to find in its completeness. :-) Even though you've told it what to do for a primary key, a MySQL table requires a gentle nudge to actually generate that new key value. Two things are needed to make the magic happen. First, you need to ensure the following annotation is in place in your Java entity classes: @GeneratedValue(strategy = GenerationType.IDENTITY) All well and good, but the real key is this: in your controller class(es), you'll have a create() function that looks something like this, minus the comment line and the setId() call in bold red type:     public String create() {         try {             // Assign 0 to ID for MySQL to properly auto_increment the primary key.             current.setId(0);             getFacade().create(current);             JsfUtil.addSuccessMessage(ResourceBundle.getBundle("/Bundle").getString("CategoryCreated"));             return prepareCreate();         } catch (Exception e) {             JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("/Bundle").getString("PersistenceErrorOccured"));             return null;         }     } Setting the current object's primary key attribute to zero (0) prior to saving it tells MySQL to get the next available value and assign it to that record's key field. Short and simple…but not inherently obvious if you've never used that particular combination of NetBeans/JSF/MySQL before. Hope this helps! All the best, Mark

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  • Encrypt connection between apache web server and mysql server.

    - by microchasm
    I'm setting up a local webapp. I have a CentOS-5 box that will be the webserver (Apache 2.2). I have another box (RHEL5) that will be used only for MySQL. The data will be encrypted on the webserver via PHP before being sent to the MySQL box and inserted into the db. All web-based connections to the webserver will be encrypted via SSL. From the research I've done, it's not totally clear on whether or not there is a need to encrypt the connection to the db from webserver (NB paranoia level: Orange). If it is not overkill, or even if it is (unless it is a really bad idea for some reason), any advice or pointers on the direction to take to get this done would be appreciated.

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  • What possible events could cause a MySQL database to revert to a previous state?

    - by justkevin
    A client of mine recently had a strange event with their MySQL database. Several days ago, one database suddenly "went back in time". All the data was in the state it was in several months ago. Even most of the .MYD and .MYI files had timestamps from November. Fortunately, the server is not in production yet, but we need to understand how it happened so it doesn't happen again. I'm not a MySQL guru, but I couldn't think of a scenario that could cause the database to rewind like that short of restoring from a backup. What could have happened here? Where should I look for clues? (Server is FreeBSD 6.4)

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  • How can I change my mysql user that has all privileges on a database to only have select privileges on one specific table?

    - by Glenn
    I gave my mysql user the "GRANT ALL PRIVILEGES ON database_name.* to my_user@localhost" treatment. Now I would like to be more granular, starting with lowering privileges on a specific table. I am hoping mysql has or can be set to follow a "least amount of privileges" policy, so I can keep the current setup and lower it for the one table. But I have not seen anything like this in the docs or online. Other than removing the DB level grant and re-granting on a table level, is there a way to get the same result by adding another rule?

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  • Linux: How to rename old mysqld when upgrading MySQL?

    - by Continuation
    I'm upgrading MySQL from MySQL 5.0 to Percona Server 5.1. I'm planning to just use yum remove and yum install to do the upgrade. However, I read in the documentation that it's a good idea to rename the old mysqld to mysqld-5.0. And if the upgrade doesn't work, I could just revert back to the old version. How exactly does this work? If I use yum remove, doesn't that mean the old mysqld is removed? So how do I rename it? Where is mysqld located? How do I find it? Thanks.

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  • Kostenlose MySQL Seminare im Mai

    - by A&C Redaktion
    Im Mai führen wir für Sie zahlreiche MySQL Seminare mit unterschiedlichen Themenschwerpunkten durch. Vom „Skalierbarkeitstag“ über einen praxisorienterten MySQL Enterprise Workshop bis hin zum Überblick über die Hochverfügbarkeitslösungen für MySQL mit Anwendungsbeispiel aus der Praxis. Wir würden uns sehr freuen, Sie bei einem dieser Seminare begrüßen zu dürfen. Die einzelnen Termine und Anmeldungslinks finden Sie hier. Wir freuen uns auf Ihre Teilnahme!

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  • Open Source MariaDB, the MySQL fork to replace MySQL?

    - by Jenson
    Normal 0 false false false EN-GB X-NONE X-NONE MicrosoftInternetExplorer4 Frankly speaking, I’ve been out of touch with the Open source world for quite some time. Until recently, after I’ve joined the new government agency, I managed to do some research while given time to learn new technologies and languages. I started reading tech blogs and tech news again (since I’m not as busy as before where I need to rush for project deadlines in and out), and I spotted this MariaDB that really attracts my attention, this is the link to ZDNet article - http://www.zdnet.com/open-source-mariadb-a-mysql-fork-challenges-oracle-7000008311/ Open-Source MariaDB, a MySQL fork, challenges Oracle Yes, you’re right, MariaDB is a MySQL fork, and as mentioned in the article, MariaDB is run by the founder of MySQL, Michael ‘Monty’ Widenius, and he claims MariaDB is faster, more secure and has more features than MySQL. I’m actually very excited to know that the code is maintained by the same dedicated core team of MySQL in the past 18 years. They even bother to form a foundation, the MariaDB Foundation, to promote MariaDB. Already, there’s a lot of open source software officially supporting MariaDB, such as  Drupal, Jelastic – Java in the cloud, Kajona, MediaWiki, phpMyAdmin, Plone, SaltOs, WordPress, and Zend Framework. But the hosting service provider might not be readily supporting MariaDB in their hosting solution. Normal 0 false false false EN-GB X-NONE X-NONE MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;} Time will tell whether MariaDB would be the real replacement for MySQL, I’m sorry I don’t think I should use alternative here ;-) For more information, please visit MariaDB official site. /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi; mso-fareast-language:EN-US;}

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  • Best practice for ONLY allowing MySQL access to a server?

    - by Calvin Froedge
    Here's the use case: I have a SaaS system that was built (dev environment) on a single box. I've moved everything to a cloud environment running Ubuntu 10.10. One server runs the application, the other runs the database. The basic idea is that the server that runs the database should only be accessible by the application and the administrator's machine, who both have correct RSA keys. My question: Would it be better practice to use a firewall to block access to ALL ports except MySQL, or skip firewall / iptables and just disable all other services / ports completely? Furthermore, should I run MySQL on a non-standard port? This database will hold quite sensitive information and I want to make sure I'm doing everything possible to properly safeguard it. Thanks in advance. I've been reading here for a while but this is the first question that I've asked. I'll try to answer some as well = )

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  • When to use MySQL replication or DRBD for HA on Xen VM?

    - by user62513
    I'm setting up a database which needs to be needs to provide High Availabilty. My primary concern is high performance and robustness (I don't want something that will fail fast and badly). The database is accessed by the application at an average of 300 qps. It's will run on Xen VMs and it has some InnoDB tables as well as MyISAM tables. The VMs are connected via ethernet 100Mbit/s ethernet cables. Which of the two - MySQL replication or DRBD - would you recommend in such a situation? Or should I use DRBD to make the master database Highly Available and use MySQL replication on the slaves? I'm a developer so these things are all not so easy for me to make a sound judgement.

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  • Does admin=true and root has the same privileges on AIX?

    - by Boaz Tirosh
    Does a user in /etc/security/user with the parameter admin set to true (admin = true) has the same privileges as the root user? According to IBM (full information here): admin Defines the administrative status of the user. Possible values are: true The user is an administrator. Only the root user can change the attributes of users defined as administrators. false The user is not an administrator. This is the default value. Is there another type of user, or are admin and root the same?

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  • Thank You MySQL Connect Content Committee Members

    - by Bertrand Matthelié
    Yesterday we announced the publication of the MySQL Connect Content Catalog. We would like today to thank the MySQL Connect Content Committee members, and especially our external members, for their efforts helping us to build the best possible MySQL Connect program. The Call for Papers had generated a large number of great submissions (thank you all for that!) and it was indeed a tough job to select sessions among those. So thank you very much, Sheeri, Erin, Giuseppe, Calvin and Yoshinori! Your input has been invaluable. Learn more about MySQL Connect (San Francisco Sept 21-23). Register Now and Save US$500 with the Early Bird Discount.

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  • Domain controller policies having administrative issues with program installations

    - by russ
    I have an issue with our domain and policies where a user needs administrative rights to install a program and someone provides the credentials for the 'run as admin' or 'run as other user' it will always show an error: Cannot find specified file on the drive. So we cannot install programs for our employees. How I fix it is I add the user to administrators, force a policy update, have them reboot, run as administrator and install it that way. Then remove them after and update the policy. Another way was to right click the install file (.exe/.msi) and add the user and administrator as an owner with full control. Only works when we have the installation file. I have no idea how to fix this and I can't find a relevant thread or QA about this problem. I can only find users having issues on their home computers not on a domain. Any help and threads to read would be great!

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  • Windows Server 2003 - Give User Full Admin Privileges

    - by APShredder
    I am running Windows Server 2003. There are a couple of user accounts that I would like to promote to Administrator accounts. I've tried several ways to do so, but I am still relatively new to setting up a server. If anyone has any ideas on how to go about promoting these users, I thank you in advance. EDIT: I should probably mention that this a domain controller. I didn't realize that this changed the answer I was looking for. I apologize, like I said before I am new to the world of servers. EDIT #2: I've added the users to the Administrator group like most of the answer recommended, but the users don't seem to have admin rights yet. I think this might be because they are also in the Domain Users group, which I can't seem to be able to remove them from.

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  • Migrate servers without losing any data / time-limited MySQL dump?

    - by inac
    Is there a way to migrate from an old dedicated server to a new one without losing any data in-between - and with no downtime? In the past, I've had to lose MySQL data between the time when the new server goes up (i.e., all files transferred, system up and ready), and when I take the old server down (data still transferred to old until new one takes over). There is also a short period where both are down for DNS, etc., to refresh. Is there a way for MySQL/root to easily transfer all data that was updated/inserted between a certain time frame?

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  • How can you get MySQL statistics for a specific user?

    - by Exit
    I've searched Google for a while on this and I'm not sure if it is easily or directly possible. I'm hosting a database on my cPanel server for a client which is accessed from their main website. As a result, I can't find a way to determine what amount of resources they are using. As there aren't any files under their account, cPanel reports the bandwidth at zero. I do know the stat programs don't monitor MySQL and that MySQL has a global statistics page that reports all usage on the server.

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  • Windows Server 2003 - Give User Full Admin Privileges

    - by APShredder
    I am running Windows Server 2003. There are a couple of user accounts that I would like to promote to Administrator accounts. I've tried several ways to do so, but I am still relatively new to setting up a server. If anyone has any ideas on how to go about promoting these users, I thank you in advance. EDIT: I should probably mention that this a domain controller. I didn't realize that this changed the answer I was looking for. I apologize, like I said before I am new to the world of servers. EDIT #2: I've added the users to the Administrator group like most of the answer recommended, but the users don't seem to have admin rights yet. I think this might be because they are also in the Domain Users group, which I can't seem to be able to remove them from.

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  • Stairway to SQL Dialects Level 3: MySQL

    As part of the LAMP stack, MySQL is incredibly important for providing a reliable and platform-agnostic database platform for web development. This level looks at the syntax of MySQL and how to best port SQL code to a MySQL environment. NEW! The easiest way to deploy .NET codeDeploy ASP.NET applications fast, frequently, and without fuss, using Deployment Manager, the new tool from Red Gate. Try it now.

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