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• How to create a MySQL query for time based elements with a 'safe window'?

  - by pj4533

  I am no SQL expert, far from it. I am writing a Rails application, and I am new at that as well. I come from a desktop programming background. My application has a table of data, one of the columns is the time at which the data was logged. I want to create a query with a 'safe window' around EACH row. By that I mean, it returns the first row, then for X minutes (based on the timelogged column) it won't return any data, once X minutes is up, it will return the next row. For example: ID | TimeLogged 1 | 3/5/2010 12:01:01 2 | 3/5/2010 12:01:50 3 | 3/5/2010 12:02:03 4 | 3/5/2010 12:10:30 5 | 3/5/2010 01:30:03 6 | 3/5/2010 01:31:05 With a 'safe window' of 5 minutes I want to create a query to return: 1 | 3/5/2010 12:01:01 4 | 3/5/2010 12:10:30 5 | 3/5/2010 01:30:03 (It skipped the 12:01:50 and 12:02:03 items because they occurred within 5 minutes of the first item.) Another example, with a 'safe window' of 15 minutes I want to return: 1 | 3/5/2010 12:01:01 5 | 3/5/2010 01:30:03 Perhaps I have to just return all data and parse it myself?

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• MYSQL autoincrement a column or just have an integer, difference?

  - by David19801

  Hi, If I have a column, set as primary index, and set as INT. If I don't set it as auto increment and just insert random integers which are unique into it, does that slow down future queries compared to autincrementing? Does it speed things up if I run OPTIMIZE on a table with its primary and only index as INT? (assuming only 2 columns, and second column is just some INT value) (the main worry is the upper limit on the autoincrement as theres lots of adds and deletes in my table)

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• query mysql table and fetch rows posted in 3 days

  - by Mac Taylor

  Hey guys how can i query my mysql database and fetch rows which are posted in earlier 3 days i know how to fetch todays's rows but not 3 days ago time will save in my table like this : 2010-01-20 19:17:49 and this is what i know : SELECT id FROM pages WHERE date=now() but i need to show posts in 3days and im looking for a simple and straight solution ,because i know how to do so in long php codes

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• restrict users from changing rows inserted 3 hours ago in mysql

  - by htaikthegreat

  Hi, I inserted a number of rows 3 hours ago and I don't want these rows from changing. How can I write sql statement that compare current time with the timstamp in the row and restrict users from changing it if abouve creteria is met. Thanks

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• MySQL: How can I select only the last update for each user?

  - by KeyStroke

  Say I have a 'user_log' table with the following field: id user_id status_text timestamp How do I write a query that selects only the last update for all the users in that table? Appreciate your help :)

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• BackUp MySql Database from CommandLine

  - by srk

  I am able to backup mysql database via command line by executing the below : C:\MySQL\MySQL Server 5.0\bin\mysqldump\" -uroot -ppassword sample \"D:/admindb/AAR12.sql\" But there is no DROP and CREATE database queries in my .mysql file What should i add in the syntax to get the create info to my generated .sql file ?

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• Update query not effecting all rows in database

  - by Webnet

  I have the following query.... UPDATE vehicle_catalog SET parent_id = 0 WHERE parent_id = SUBSTR(id, 0, 5) I need to set all parent_ids to 0 where the first 5 characters of id is the same as the parent_id. This is effecting 0 rows when I'm looking at the data and it should be effecting over 10,000. Any ideas on why this wouldn't be effecting all rows?

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• SSL Certificate error: verify error:num=20:unable to get local issuer certificate

  - by Brian

  I've been trying to get an SSL connection to an LDAPS server (Active Directory) to work, but keep having problems. I tried using this: openssl s_client -connect the.server.edu:3269 With the following result: verify error:num=20:unable to get local issuer certificate I thought, OK, well server's an old production server a few years old. Maybe the CA isn't present. I then pulled the certificate from the output into a pem file and tried: openssl s_client -CAfile mycert.pem -connect the.server.edu:3269 And that didn't work either. What am I missing? Shouldn't that ALWAYS work?

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• Little mysterious RowMatch

  - by kishore.kondepudi(at)oracle.com

  Incidentally this was the first piece of code i ever wrote in ADF.The requirement was we have tax rates which are read from a table.And there can be different type of tax rates called certificates or exceptions based on the rate_type column in the tax rates table.The simplest design i chose was to create an EO on the tax rates table and create two VO's called CertificateVO and ExceptionVO based on the same EO.So far so good.I wrote all the business logic in the EO and completed the model project.The CertificateVO has the query as select * from tax_rates TaxRateEO where rate_type='CERTIFICATE' and similary the ExceptionVO is also built.The UI is pretty simple and it has two tabs called Certificates and Exceptions and each table has a button to create a tax rate.The certificate tab is driven by CertificateVO and exception tab is driven by ExceptionVO.The CertificateVO has default value of rate_type set to 'CERTIFICATE' and ExceptionVO has default value of rate_type to 'EXCEPTION' to default values for new records.So far so good.But on running the UI i noticed a strange thing,When i create a new row in Certificate i see the same row in Exception too and vice-versa.i.e; what ever row i create in one VO it also appears in the second one although it shouldn't be.I couldn't understand the reason for behavior even though an explicit where clause is present.Digging through documentation i found that ADF doesnt apply the where clause to new rows instead it applies something called as RowMatch to them.RowMatch in simple terms is a where condition applied to the VO rows at runtime.Since we had both VO's based on the same EO we have the same entity cache.The filter factor for new rows to be shown in VO at runtime is actually RowMatch than the where clause defined in the VO.The default RowMatch is empty as a result any new row appears in both the VO's since its from same entity cache.The solution to this problem is to use polymorphic view objects which can do the row filter based on configuration or override the getRowMatch() method in the VOImpl and pass the custom where filter instead of default RowMatch.Eg:@Overridepublic RowMatch getRowMatch(){    return new RowMatch("rate_type='CERTIFICATE'");}similarly for ExceptionVO too.With proper RowMatch in place new rows will route themselves to appropriate VO.PS: The behavior(Same row pushed to both VO's from entity cache) is also called as ViewLink Consistency.Try it out!

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• Late feedback

  - by Sveta Smirnova

  MySQL Community team asked me to write about Devconf 2013 few months ago. Conference was in June, 2013, but I remembered about this my promise only now: month later after my participating in MySQL Connect and Expert Troubleshooting seminar (change country to United Kingdom if you see blank page). I think it is too late for the feedback, but I still have few thoughts which I want to record.DevConf (former PHPConf) always was a place where I tried new topics. At first, because I know audience there very well and they will be bored if I repeat a story which I was telling last year, but also because it is much easier to get feedback in your own native language. But last years my habit seems started to change and I presented improved version of my 2012 MySQL Connect talk about MySQL backups. Of course, I also had a seminar with unique topic, made for this conference first time: Troubleshooting MySQL Performance with EXPLAIN and Using Performance Schema to Troubleshoot MySQL. And these topics, improved, were presented at the expert seminar. It is interesting how my habit changes and one public speaking activity interferes next one.What is good about DevConf is it forces you to create new ideas and do it really well, because audience is not forgiving at all, so they catch everything you miss or prepared not good enough. This can be bad if you want to make a marketing-style topic for free, but allows to present technical features in really good details: all these sudden discussions really help.In year 2013 Oracle had a booth at the conference and was presented by a bunch of people. Dmitry Lenev presented topic "New features of replication in MySQL 5.6" and Victoria Reznichenko worked on the booth. What was new at the conference this year is greater interest in NoSQL, scale and fast development solutions. This, unfortunately, means not so huge interest in MySQL as it was earlier. However, at the same time, "Common" track was really MySQL track: not only Oracle, but people from other companies presented about it.

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• Benchmarking MySQL on win7

  - by Patrick

  I've setup a nginx server running php 5.3.6 and mysql 5.5.1.3. My computer is an AMD quadcore 9650, 4gb ram, 500gb 7200rpm HD. I ran the PHP MySQL Benchmark Tool v. 0.1, and got the following results: Testing a(n) MYISAM table using 100000 rows. Successfully created database speedtestdb Sucessfully created table speedtesttable Table Type Verified: MYISAM .. Done. 100000 inserts in 19.73628 seconds or 5067 inserts per second. Done. 100000 row reads in 0.2801 seconds or 357015 row reads per second. Done. 100000 updates in 4.03876 seconds or 24760 updates per second. I'm wondering where this stands as far as performance goes, and what are some steps I can take if any to improve on this. I'm not trying to make anything fantastic, just getting a feel for how to best optimize a web server in this configuration.

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• MySql Replication with a star topology

  - by Riotopsys

  My company currently operates in 3 separate locations connected by slow vpn links. Each site hosts a dedicated MySql server. I need to aggregate the data from all three of them onto a single server for corporate reporting. The powers that be have stated I cannot use circular replication or federated tables. Is there a third party tool for MySql that can replicate from multiple masters? Basically the diagram would be a daisy with the reporting server slave at center with multiple replication connections coming in from the master sites on the petals.

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• Database cluster... without Master/Slave?

  - by RadiantHex

  Hi there! I'm wondering if it is possible to have a set of SQLdb servers to which data is written and have them replicate, avoiding conflicting information. I imagine that a Master/Slave structure would be mandatory, I would like to know if a system where servers have no hierarchy could support replication. Currently I'm using MySQL, but I would be happy to move to another database if needed. Any ideas? :)

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• MySQL per-database replication?

  - by LucasBr

  So, my problem is interesting: we want to migrate from one server to another. We made a master-slave replication, but my boss came with the idea to make migration one database at a time. So he asked me to setup at the new server another MySQL instance, let the slave almost as-is and make the new instance be the new master incrementally, one database at a time. Is it possible, that is, can I transfer the database 'x' from old master to new master and just tell slave to synchronize 'x' at the new master from now on? I've read at this old thread ( Mysql Replication - are per-database threads possible? ) that this was not possible at that time. This can be done now? Thanks! Lucas Bracher.

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• Recovering/Rebuilding MySQL .FRM, .MY* files from IBDATA1

  - by Synetech

  I recently had an incident in which several MySQL files were wiped out (mostly from WordPress, but also a few of MySQL’s own files). The IBDATA1 file is unaffected, but several .frm are gone as are a few .myi and .myd files. So now I need to find out if there is a way to rebuild the missing files from IBDATA1. I tried Googling it, assuming that such an issue has come up before, and indeed there were numerous search results (including this question), but all of the ones I looked at were the opposite, about recovering from .frm and .my* files or somehow required these files. Is there a way to rebuild these files? I know I have a relatively recent backup (a .SQL file) if there isn’t, but I’m hoping that these are the kind of files that are rebuilt if missing or outdated.

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• MYSQL backup and restore

  - by Codezy

  I am having trouble getting mysql backups to run properly when their are views in the database. I think this might have something to do with needing a placeholder object for it. In any event I run this command: mysqldump -u myuser -pmypassword mydatabase | mysql -u myuser -pmypassword -C mydatabase_Beta The user has full privileges and I get this: View mydatabase_beta.yadayada references invalid tables or columns or functions or definer/invoker or view lack rights to use them. How can I back it up so that it restores all of my database properly? In the example I am restoring it to a different name but I do need to be able to restore a working copy. I think it is probably an additional mysqldump parameter or maybe hot copy would work better. Thoughts?

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• MySQL is killing the server IO.

  - by OneOfOne

  I manage a fairly large/busy vBulletin forums (~2-3k requests per second, running on gigenet cloud), the database is ~ 10 GB (~9 milion posts, ~60 queries per second), lately MySQL have been grinding the disk like there's no tomorrow according to iotop and slowing the site. The last idea I can think of is using replication, but I'm not sure how much that would help and worried about database sync. I'm out of ideas, any tips on how to improve the situation would be highly appreciated. Specs : Debian Lenny 64bit ~12Ghz (6 cores) CPU, 7520gb RAM, 160gb disk. Kernel : 2.6.32-4-amd64 mysqld Ver 5.1.54-0.dotdeb.0 for debian-linux-gnu on x86_64 ((Debian)) Other software: vBulletin 3.8.4 memcached 1.2.2 PHP 5.3.5-0.dotdeb.0 (fpm-fcgi) (built: Jan 7 2011 00:07:27) lighttpd/1.4.28 (ssl) - a light and fast webserver PHP and vBulletin are configured to use memcached. MySQL Settings : [mysqld] key_buffer = 128M max_allowed_packet = 16M thread_cache_size = 8 myisam-recover = BACKUP max_connections = 1024 query_cache_limit = 2M query_cache_size = 128M expire_logs_days = 10 max_binlog_size = 100M key_buffer_size = 128M join_buffer_size = 8M tmp_table_size = 16M max_heap_table_size = 16M table_cache = 96

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• installing old MySQL client libraries (libmysqlclient.so.15, libpq.so.4)

  - by Elijah Paul

  I'm attempting to install Nagios plugins on a Zimbra 8.0.2 server running CentOS 6.4, but have run into the following error when I run yum install nagios-plugins-all Error: Package: nagios-plugins-mysql-1.4.15-2.el5.x86_64 (epel) Requires: libmysqlclient.so.15()(64bit) Error: Package: nagios-plugins-pgsql-1.4.15-2.el5.x86_64 (epel) Requires: libpq.so.4()(64bit) Error: Package: nagios-plugins-mysql-1.4.15-2.el5.x86_64 (epel) Requires: libmysqlclient.so.15(libmysqlclient_15)(64bit) You could try using --skip-broken to work around the problem You could try running: rpm -Va --nofiles --nodigest How can I install these libraries (libmysqlclient.so.15 & libpq.so.4)? Will installing these libraries possibly break Zimbra?

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• Use pt-table-sync to setup a new MySQL DB

  - by Generation D Systems

  I have 2 hosts (A and B). B contains a MySQL server with a database called mydb, and A contains a MySQL server with nothing (fresh install). I want to replicate the entire mydb from B to A, by running a script on A (I do not have shell access to B). Can I run this on A: pt-table-sync --execute h=b.mydomain.com,D=mydb h=a.mydomain.com I've read the docs but don't get a 100% comfort feeling (perhaps because of all the warnings about damaging your data if you don't know what you're doing). Will this work? as well, is h=a.mydomin.com necessary? (Will it route all traffic back in/out the local NIC?) can I use localhost or nothing at all?

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• how connect to local mysql server (LAN)

  - by clarkk

  I got two Debian 6 servers - one for web and one for the database.. How can I connect through the local area network? On both servers I have permanently changed the hostnames /etc/hostname /etc/hosts web => web-server db => db-server In the privileges in mysql I have set the root user to accept requests from web-server (instead of localhost) and from the web-server I connect to db-server in my.cnf I have escaped the following line: # bind-address = 127.0.0.1 error Warning: mysqli::mysqli(): (HY000/2005): Unknown MySQL server host 'db-server' (1)

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• MySQL blocking new connections, and mysqladmin flush-hosts

  - by aidan

  I'm running MySQL on a remote server, and it suddenly started rejecting all connections: $ mysql -h 192.168.1.10 -u root -p ERROR 1129 (00000): Host 'web' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts' So, I try this flush-hosts command... $ mysqladmin flush-hosts -h 192.168.1.10 -u root -p mysqladmin: connect to server at '192.168.1.10' failed error: 'Host 'web' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'' I.e. it's blocking the very un-blocking tool it recommends. Am I doing it wrong, or will I have to resort to ssh/cpanel/physical access?

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• Good/Better config for MySQL on an EC2 Large Instance

  - by Tim Reynolds

  I have an EC2 Large instance dedicated to MySQL. It will be serving a Joomla/Magento combo so it has a blend of InnoDB and MyISAM tables. I have only worked with MyISAM in the past and am therefore unfamiliar with the settings InnoDB uses. Experiments so far have been less than fruitful, as I keep causing the InnoDB engine to be disabled. My instance is running Ubuntu 10.04 64 bit server edition and has ~7.5G of ram. MySQL is currently using ~0.6% of that, with somewhat poor performance. I would like to configure it to use as much of the system RAM as is reasonable. Testing some settings I learned that the InnoDB logs can't collectively be larger than 4G. Would anyone be able to provide some base InnoDB and MyISAM settings to get my started. Thank you Tim

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• Ubuntu Server Edition (Jaunty) x64 Segmentation faults in PHP mysql package

  - by Deeksy

  I've been running Jaunty with Apache2, PHP & MySQL running drupal websites as well as python 2.6 and trac on the same server. I'm getting quite a few segmentation faults and suhosin warnings on my drupal websites which don't seem to be related to the amount of RAM the server has (3GB) as the trac site is running happily without issues. The issue seems to be related to PHP accessing mysql and I'm getting suhosin warnings. Has anyone else seen this problem? Any ideas on how to fix it? Funnily enough, it's not a consistent error, as restarts tend to fix the issue temporarily.

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• mysql remote connection [closed]

  - by Fel

  I spoke with my host supporter to find what is my sql hostname. He said that the only way is add permissions in mysql remote (cpanel) to my actual ip. So the config in heidiSQL for example will be localhost userxxx passxxx But i have a dynamic ip, so i need to change the permissions every time, correct? Add the flag % probably is not a good idea, so how can I solve this problem? Why I dont have something like mysql.something.com ? Sorry, if this question is too basic.

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• Ruby, Rails & MySQL parity between Mac Client (10.6) & XServe (10.5)

  - by Meltemi

  We're setting up a RoR setup with Development on Mac OS X Client (10.6.3) and then using a Mac OS X Server (10.5.8) for testing and eventually deployment. I'd like to get as many systems in sync on these machines as possible. Wondering if there are any pitfalls. I seem to understand what's necessary under Client but Server has some hardwired stuff that I want to make sure doesn't break...or is updated correctly. Currently installed on both machines we have: OS X Client (10.6.3): Ruby 1.8.7 Rails 2.3.5 MySQL (not installed yet) OS X Server (10.5.8): Ruby 1.8.6 Rails 2.3.5 MySQL Ver 14.12 Distrib 5.0.82 Any suggestions...Ideally from someone who's done this on Leopard Server as well but I'll listen to general tips & proceedures

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