Search Results

Search found 33911 results on 1357 pages for 'mysql select'.

Page 80/1357 | < Previous Page | 76 77 78 79 80 81 82 83 84 85 86 87  | Next Page >

  • Speed up MySQL for inserts (for testing purposes)

    - by Alex N
    I have a bit of software that needs to do a lot of INSERTs. In production environment there'll be some serious tweaking and testing and stuff like that, but now when I need to test it I'd like to speed up inserts as much as possible. Hence my question - is there a way to tweak mysql such that it doesn't do much disk I/O but keeps everything in RAM and syncs with disk rarely(like once n-seconds say?)

    Read the article

  • Install MySQLdb on a Mac

    - by Youcha
    I have Python 32 bits, I installed MySQL Community server 32 bits and I'm trying to install MySQLdb for Python. I run easy_install mysql-python and I have this error > easy_install mysql-python Searching for mysql-python Reading http://pypi.python.org/simple/mysql-python/ Reading http://sourceforge.net/projects/mysql-python/ Reading http://sourceforge.net/projects/mysql-python Best match: MySQL-python 1.2.4b5 Downloading http://pypi.python.org/packages/source/M/MySQL-python/MySQL-python-1.2.4b5.zip#md5=4f645ed23ea0f8848be77f25ffe94ade Processing MySQL-python-1.2.4b5.zip Running MySQL-python-1.2.4b5/setup.py -q bdist_egg --dist-dir /var/folders/ke/ke8HKCuzGB4LMCJ1eIAGqk+++TI/-Tmp-/easy_install-W_yT0e/MySQL-python-1.2.4b5/egg-dist-tmp-GjLaFB Downloading http://pypi.python.org/packages/source/d/distribute/distribute-0.6.28.tar.gz Extracting in /var/folders/ke/ke8HKCuzGB4LMCJ1eIAGqk+++TI/-Tmp-/easy_install-W_yT0e/MySQL-python-1.2.4b5/temp/tmpOVVY_R Now working in /var/folders/ke/ke8HKCuzGB4LMCJ1eIAGqk+++TI/-Tmp-/easy_install-W_yT0e/MySQL-python-1.2.4b5/temp/tmpOVVY_R/distribute-0.6.28 Building a Distribute egg in /private/var/folders/ke/ke8HKCuzGB4LMCJ1eIAGqk+++TI/-Tmp-/easy_install-W_yT0e/MySQL-python-1.2.4b5 /private/var/folders/ke/ke8HKCuzGB4LMCJ1eIAGqk+++TI/-Tmp-/easy_install-W_yT0e/MySQL-python-1.2.4b5/distribute-0.6.28-py2.6.egg unable to execute gcc-4.0: No such file or directory error: Setup script exited with error: command 'gcc-4.0' failed with exit status 1 Any idea on why gcc-4.0 cannot be found? I have Xcode and gcc 4.2.1 installed.

    Read the article

  • Bugzilla Install question - I'm stuck

    - by Nabeel
    I run Bugzilla's checksetup.pl (migrating an older version), and it always returns: Reading ./localconfig... Checking for DBD-mysql (v4.00) ok: found v4.005 Had to create DBD::mysql::dr::imp_data_size unexpectedly at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DBI.pm line 1229, <DATA> line 225. Use of uninitialized value in subroutine entry at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DBI.pm line 1229, <DATA> line 225. Had to create DBD::mysql::db::imp_data_size unexpectedly at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DBI.pm line 1259, <DATA> line 225. Use of uninitialized value in subroutine entry at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DBI.pm line 1259, <DATA> line 225. There was an error connecting to MySQL: Undefined subroutine &DBD::mysql::db::_login called at /usr/lib64/perl5/site_perl/5.8.8/x86_64-linux-thread-multi/DBD/mysql.pm line 142, <DATA> line 225. MySQL Version: [root@bugzilla-core TMP]# mysql --version mysql Ver 14.12 Distrib 5.0.60sp1, for redhat-linux-gnu (x86_64) using readline 5.1 And mysql_config: [root@bugzilla-core TMP]# mysql_config Usage: /data01/mysql-5.0.60/bin/mysql_config [OPTIONS] Options: --cflags [-I/data01/mysql-5.0.60/include -g] --include [-I/data01/mysql-5.0.60/include] --libs [-rdynamic -L/data01/mysql-5.0.60/lib -lmysqlclient -lz -lcrypt -lnsl -lm -lmygcc] --libs_r [-rdynamic -L/data01/mysql-5.0.60/lib -lmysqlclient_r -lz -lpthread -lcrypt -lnsl -lm -lpthread -lmygcc] --socket [/tmp/mysql.sock] --port [0] --version [5.0.60sp1] --libmysqld-libs [-rdynamic -L/data01/mysql-5.0.60/lib -lmysqld -lz -lpthread -lcrypt -lnsl -lm -lpthread -lrt -lmygcc] Now, I've tried the latest version of DBD-mysql (4.0.14). I'm completely lost and stumped. I'm not sure where to go from here. Scouring the 'webs haven't returned anything fruitful. Any ideas?

    Read the article

  • MySQL HA Events in the UK, Germany & France

    - by Bertrand Matthelié
    @font-face { font-family: "Arial"; }@font-face { font-family: "Times"; }@font-face { font-family: "Cambria"; }p.MsoNormal, li.MsoNormal, div.MsoNormal { margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: "Times New Roman"; }a:link, span.MsoHyperlink { color: blue; text-decoration: underline; }a:visited, span.MsoHyperlinkFollowed { color: purple; text-decoration: underline; }p { margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: "Times New Roman"; }div.Section1 { page: Section1; } Oracle is running MySQL High Availability breakfast seminars in London, Düsseldorf and Paris. During these free seminars, we will review the various options and technologies at your disposal to implement highly available & highly scalable MySQL infrastructures, as well as best practices in terms of architectures. The packed agenda will include High Availability features in MySQL 5.5, MySQL Replication, MySQL Cluster, the newly released Oracle VM Template for MySQL Enterprise Edition as well as what's new in MySQL 5.6 and MySQL Cluster 7.2, including NoSQL access methods to MySQL. There are a few places left for the seminar in London taking place tomorrow, June 29th, Register Now! Learn more and register for the event in Düsseldorf, July 13th. Learn more and register for the event in Paris, September 7th. We hope to see you there!

    Read the article

  • MySQL Workbench 5.2.43 GA released

    - by Alfredo Kojima
    The MySQL developer tools team announces the availability of version 5.2.43 of the MySQL Workbench GUI tool. This version contains various fixes and minor enhancements and includes 53 resolved bugs. With this version, Fedora 15 packages are replaced with Fedora 17. Also, Gatekeeper in Mac OS X Mountain Lion is now properly handled. For a full list of issues fixed in this release, see http://dev.mysql.com/doc/workbench/en/changes-5.2.x.html Please get your copy from our Downloads site. In Windows, you can also use the MySQL Windows Installer to update Workbench. Sources and binary packages are available for several platforms, including Windows, Mac OS X and Linux. http://dev.mysql.com/downloads/workbench/ Workbench Documentation can be found here. http://dev.mysql.com/doc/workbench/en/index.html Utilities Documentation can be found here. http://dev.mysql.com/doc/workbench/en/mysql-utilities.html If you need any additional info or help please get in touch with us. Post in our forums or leave comments on our blog pages. - The MySQL Workbench Team

    Read the article

  • MySQL Connector/NET 6.9.1 beta has been release

    - by Roberto Garcia
    Dear MySQL users, MySQL Connector/Net 6.9.1 a new version of the all-managed .NET driver for MySQL has been released. This is a beta release for 6.9.x and is not recommended for production environments. It is appropriate for use with MySQL server versions 5.5-5.7. It is now available in source and binary form from http://dev.mysql.com/downloads/connector/net/#downloadsandmirrorsites (note that not all mirror sites may be up to date at this point-if you can't find this version on some mirror, please try again later or choose another download site.) Changes in MySQL Connector/Net 6.9.1 (2014-05-29, Beta)    Functionality Added or Changed      * Asynchronous methods are now supported.    Bugs Fixed      * When a client refreshed a web page associated with an expired        session and if the ASP.NET project was using <SessionState ...        regenerateExpiredSessionId="true" ...>, a "duplicate entry"        exception was generated from the MySqlSessionProvider. (Bug        #18657550, Bug #70409) The documentation is available at: http://dev.mysql.com/doc/refman/5.7/en/connector-net.html Enjoy and thanks for the support! On behalf of the MySQL Connector/NET and the MySQL/ORACLE RE Team. 

    Read the article

  • SQL Select - adding field to Select is changing the results

    - by nycdan
    I'm stumped by this SQL problem that I suspect will be easy pickings for someone out there. I have a table that contains rows representing several daily lists of ranked items. The relevent fields are as follows: ID, ListID, ItemID, ItemName, ItemRank, Date. I have a query that returns the items that were on a list yesterday but not today (Items Off List) as follows: Select ItemID, ListID, ItemName, convert(varchar(10),MAX(date),101) as date, COUNT(ItemName) as days_on_list From Table Group By ItemID, ListID, ItemName Having Max(date) = DATEADD("d",-1,convert(varchar(10),getdate(),101)) and ListID = 1 Order By ListID, ItemName, COUNT(ItemName) Basically I'm looking for records where the max date is yesterday. It works fine and shows the number of days each item was previously on the list (although not necessarily consecutively, but that's fine for now). The problem is when I try to add ranking to see what yesterday's rank was. I tried the following: Select ItemID, ListID, ItemName, ranking, convert(varchar(10),MAX(date),101) as date, COUNT(ItemName) as days_on_list From Table Group By ItemID, ListID, ItemName, ranking Having Max(date) = DATEADD("d",-1,convert(varchar(10),getdate(),101)) and ListID = 1 Order By ListID, ItemName, ranking, COUNT(ItemName) This returns a great deal more records than the previous query so something isn't right with it. I want the same number of records, but with the ranking included. I can get the rank by doing a self-join with a subquery and getting records where the ItemID occurs yesterday but not today - but then I don't know how to get the Count any more. Appreciation in advance for any help with this. ======== SOLVED ============== Select ItemID, ListID, ItemName, ranking, convert(varchar(10),MAX(date),101) as date, COUNT(ItemName) as days_on_list from Table T Where date = DATEADD("d",-1,convert(varchar(10),getdate(),101)) and ListID = 1 and T.ItemID Not In (select T.ItemID from Table T join Table T2 on T.ItemID = T2.ItemID and T.ListID = T2.ListID where T.date = DATEADD("d",-1,convert(varchar(10),getdate(),101)) and T2.date = convert (varchar(10),getdate(),101) and T.ListID = 1) Group by ItemID, ListID, ItemName, ranking Basically, what I did was create a subquery that finds all items that appear in both days, and finds items that appeared yesterday but are not in the set of items that appeared both days. Then I was able to do the aggregate function and grouping correctly. I would NOT be surprised if this is more convoluted than necessary but I understand it and can modify it as needed and performance doesn't seem to be an issue. Thanks everyone for the assist.

    Read the article

  • change value upon select

    - by Link
    what i'm aiming is to show the other div when it selects one of the two options Full time and Part Time and if possible compute a different value for each When the user selects Part time the value of PrcA will change to PrcB this is the code i used <!====================================================================================> <script language="javascript"> <!--// function dm(amount) { string = "" + amount; dec = string.length - string.indexOf('.'); if (string.indexOf('.') == -1) return string + '.00'; if (dec == 1) return string + '00'; if (dec == 2) return string + '0'; if (dec > 3) return string.substring(0,string.length-dec+3); return string; } function calculate() { QtyA = 0; TotA = 0; PrcA = 1280; PrcB = 640; if (document.form1.qtyA.value > "") { QtyA = document.form1.qtyA.value }; document.form1.qtyA.value = eval(QtyA); TotA = QtyA * PrcA; document.form1.totalA.value = dm(eval(TotA)); Totamt = eval(TotA) ; document.form1.GrandTotal.value = dm(eval(Totamt)); } //--> </script> <!====================================================================================> <p> <label for="acct" style="margin-right:90px;"><strong>Account Type<strong><font color=red size=3> * </font></strong></label> <select name="acct" style="background-color:white;" class="validate[custom[serv]] select-input" id="acct" value=""> <option value="Full Time">Full-Time</option> <option value="Part Time">Part-Time</option> <option selected="selected" value=""></option> </select></p> <!====================================================================================> <script> $(document).ready(function() { $("input[name$='acct']").select(function() { var test = $(this).val(); $("div.desc").hide(); $("#acct" + test).show(); }); }); </script> <!====================================================================================> <p> <table><tr><td> <lable style="margin-right:91px;"># of Agent(s)<font color=red size=3> * </font></lable> </td><td> <input style="width:25px; margin-left:5px;" type="text" class="validate[custom[agnt]] text-input" name="qtyA" id="qtyA" onchange="calculate()" /> </td><td> <div id="acctFull Time" class="desc"> x 1280 = </div> <div id="acctPart Time" class="desc" style="display:none"> x 640 = </div> </td><td> $<input style="width:80px; margin-left:5px;" type="text" readonly="readonly" name="totalA" id="totalA" onchange="calculate()" /> </p> </td></tr></table> is there any way for me to achieve this?

    Read the article

  • GROUP BY as a way to pick the first row from a group of similar rows, is this correct, is there any

    - by FipS
    I have a table which stores test results like this: user | score | time -----+-------+------ aaa | 90% | 10:30 bbb | 50% | 9:15 *** aaa | 85% | 10:15 aaa | 90% | 11:00 *** ... What I need is to get the top 10 users: user | score | time -----+-------+------ aaa | 90% | 11:00 bbb | 50% | 9:15 ... I've come up with the following SELECT: SELECT * FROM (SELECT user, score, time FROM tests_score ORDER BY user, score DESC, time DESC) t1 GROUP BY user ORDER BY score DESC, time LIMIT 10 It works fine but I'm not quite sure if my use of ORDER BY is the right way to pick the first row of each group of sorted records. Is there any better practice to achieve the same result? (I use MySQL 5)

    Read the article

  • Multiple many-to-many JOINs in a single mysql query without Cartesian Product

    - by VWD
    At the moment I can get the results I need with two seperate SELECT statements SELECT COUNT(rl.refBiblioID) FROM biblioList bl LEFT JOIN refList rl ON bl.biblioID = rl.biblioID GROUP BY bl.biblioID SELECT GROUP_CONCAT( CONCAT_WS( ':', al.lastName, al.firstName ) ORDER BY al.authorID ) FROM biblioList bl LEFT JOIN biblio_author ba ON ba.biblioID = bl.biblioID JOIN authorList al ON al.authorID = ba.authorID GROUP BY bl.biblioID Combining them like this however SELECT GROUP_CONCAT( CONCAT_WS( ':', al.lastName, al.firstName ) ORDER BY al.authorID ), COUNT(rl.refBiblioID) FROM biblioList bl LEFT JOIN biblio_author ba ON ba.biblioID = bl.biblioID JOIN authorList al ON al.authorID = ba.authorID LEFT JOIN refList rl ON bl.biblioID = rl.biblioID GROUP BY bl.biblioID causes the author result column to have duplicate names. How can I get the desired results from one SELECT statement without using DISTINCT? With subqueries?

    Read the article

  • MYSQL, Subquery Reference in Union

    - by christian
    Is there any way to reference a subquery in a union? I am trying to do something like the following, and would like to avoid a temporary table, but the subquery will be drawn from a much larger dataset so it makes sense to only do it once.. SELECT * FROM (SELECT * FROM ads WHERE state='FL' AND city='Maitland' AND page='home' ORDER BY RAND()) AS sq WHERE spot = 'full-banner' LIMIT 1 UNION SELECT * FROM sq WHERE spot = 'leaderboard' LIMIT 1 UNION SELECT * FROM sq WHERE spot = 'rectangle1' LIMIT 1 UNION SELECT * FROM sq WHERE spot = 'rectangle2' LIMIT 1 .... etc,, It's a shame that DISTINCT can't be specified for a single column of a result set.

    Read the article

  • Mysql with innodb and serializable transaction does not (always) lock rows

    - by Tobias G.
    Hello, I have a transaction with a SELECT and possible INSERT. For concurrency reasons, I added FOR UPDATE to the SELECT. To prevent phantom rows, I'm using the SERIALIZABLE transaction isolation level. This all works fine when there are any rows in the table, but not if the table is empty. When the table is empty, the SELECT FOR UPDATE does not do any (exclusive) locking and a concurrent thread/process can issue the same SELECT FOR UPDATE without being locked. CREATE TABLE t ( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, display_order INT ) ENGINE = InnoDB; SET TRANSACTION ISOLATION LEVEL SERIALIZABLE; START TRANSACTION; SELECT COALESCE(MAX(display_order), 0) + 1 from t FOR UPDATE; .. This concept works as expected with SQL Server, but not with MySQL. Any ideas on what I'm doing wrong? EDIT Adding an index on display_order does not change the behavior.

    Read the article

  • Unable to initialize provider. Missing or incorrect schema. for MySql.Web connector

    - by Jreeter
    Hey guys and gals running into a little issue here.. I'm trying to use MySql Connector 6.2.2.0 for membership and role providers.. The issue I'm having is: Unable to initialize provider. Missing or incorrect schema. <authentication mode="Forms"/> <roleManager defaultProvider="MySqlRoleProvider" enabled="true" cacheRolesInCookie="true" cookieName=".ASPROLES" cookieTimeout="30" cookiePath="/" cookieRequireSSL="false" cookieSlidingExpiration="true" cookieProtection="All" > <providers> <clear /> <add name="MySqlRoleProvider" type="MySql.Web.Security.MySQLRoleProvider, MySql.Web, Version=6.2.2.0,Culture=neutral, PublicKeyToken=c5687fc88969c44d" connectionStringName="mySQL" applicationName="capcafe" writeExceptionsToEventLog="true" /> </providers> </roleManager> <membership defaultProvider="MySqlMembershipProvider"> <providers> <add connectionStringName="mySQL" applicationName="capcafe" minRequiredPasswordLength="5" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" minRequiredNonalphanumericCharacters="0" name="MySqlMembershipProvider" type="MySql.Web.Security.MySQLMembershipProvider, MySql.Web, Version=6.2.2.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" /> </providers> </membership> Here is the line it doesn't seem to like: Line 57: type="MySql.Web.Security.MySQLRoleProvider, MySql.Web, Version=6.2.2.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" I have both MySql.Web and MySql.Data referenced and in my bin! Any help resolving this issue will be very much appreciated

    Read the article

  • Mysql select - improve performances

    - by realshadow
    Hey, I am working on an e-shop which sells products only via loans. I display 10 products per page in any category, each product has 3 different price tags - 3 different loan types. Everything went pretty well during testing time, query execution time was perfect, but today when transfered the changes to the production server, the site "collapsed" in about 2 minutes. The query that is used to select loan types sometimes hangs for ~10 seconds and it happens frequently and thus it cant keep up and its hella slow. The table that is used to store the data has approximately 2 milion records and each select looks like this: SELECT * FROM products_loans WHERE KOD IN("X17/Q30-10", "X17/12", "X17/5-24") AND 369.27 BETWEEN CENA_OD AND CENA_DO; 3 loan types and the price that needs to be in range between CENA_OD and CENA_DO, thus 3 rows are returned. But since I need to display 10 products per page, I need to run it trough a modified select using OR, since I didnt find any other solution to this. I have asked about it here, but got no answer. As mentioned in the referencing post, this has to be done separately since there is no column that could be used in a join (except of course price and code, but that ended very, very badly). Here is the show create table, kod and CENA_OD/CENA_DO very indexed via INDEX. CREATE TABLE `products_loans` ( `KOEF_ID` bigint(20) NOT NULL, `KOD` varchar(30) NOT NULL, `AKONTACIA` int(11) NOT NULL, `POCET_SPLATOK` int(11) NOT NULL, `koeficient` decimal(10,2) NOT NULL default '0.00', `CENA_OD` decimal(10,2) default NULL, `CENA_DO` decimal(10,2) default NULL, `PREDAJNA_CENA` decimal(10,2) default NULL, `AKONTACIA_SUMA` decimal(10,2) default NULL, `TYP_VYHODY` varchar(4) default NULL, `stage` smallint(6) NOT NULL default '1', PRIMARY KEY (`KOEF_ID`), KEY `CENA_OD` (`CENA_OD`), KEY `CENA_DO` (`CENA_DO`), KEY `KOD` (`KOD`), KEY `stage` (`stage`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 And also selecting all loan types and later filtering them trough php doesnt work good, since each type has over 50k records and the select takes too much time as well... Any ides about improving the speed are appreciated. Edit: Here is the explain +----+-------------+----------------+-------+---------------------+------+---------+------+--------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+----------------+-------+---------------------+------+---------+------+--------+-------------+ | 1 | SIMPLE | products_loans | range | CENA_OD,CENA_DO,KOD | KOD | 92 | NULL | 190158 | Using where | +----+-------------+----------------+-------+---------------------+------+---------+------+--------+-------------+ I have tried the combined index and it improved the performance on the test server from 0.44 sec to 0.06 sec, I cant access the production server from home though, so I will have to try it tomorrow.

    Read the article

  • Mysql select most frequent and sort alphabetically

    - by user2605793
    I am trying to select the most common 100 names from a table then display the list showing the names and count. I want the user to be able to re-sort the list alphabetically rather than based on count. I thought the following code would do it. It works for the default sort by count but fails on the sort alphabetically. The line "$count = mysql_num_rows($table);" gives an error: mysql_num_rows() expects parameter 1 to be resource, boolean given. Any help would be greatly appreciated. // Get most popular surnames echo '<h2>Most Common Surnames</h2>'; if ($sort == "") { // default sort by count echo '<a href="http://mysite/names.php?id='.$id.'&sort=name">Sort by name</a><br>'; $query = "SELECT family_name, COUNT(*) as count FROM namefile WHERE record_key = $id GROUP BY family_name ORDER BY count DESC LIMIT 100"; } else { // sort alphabetically echo '<a href="http://mysite/names.php?id='.$id.'">Sort by count</a><br>'; $query = "SELECT * FROM ( SELECT family_name, COUNT(*) as count FROM namefile WHERE record_key = $id GROUP BY family_name ORDER BY count DESC LIMIT 100) AS alpha ORDER BY family_name"; } $table = mysql_query($query); $count = mysql_num_rows($table); $tot = 0; $i = 0; echo '<table><tr>'; while ($tot < $count2) { $rec2 = mysql_fetch_array($table2); echo '<td>'.$rec2[0].'</td><td>'.$rec2[1].'</td><td width="40">&nbsp;</td><td>'; if ($i++ == 6) { echo '</tr><tr>'; $i = 0; } $tot++; } echo '</tr></table><br>'; UPDATE: I needed to add "AS alpha" to give the outer select a unique name. (alpha is just a random name I made up.) It now works perfectly. Code updated for the benefit of any others who need something similar.

    Read the article

  • Long connection times from PHP to MySQL on EC2

    - by Erik Giberti
    I'm having an intermittent issue connecting to a database slave with InnoDB. Intermittently I get connections taking longer than 2 seconds. These servers are hosted on Amazon's EC2. The app server is PHP 5.2/Apache running on Ubuntu. The DB slave is running Percona's XtraDB 5.1 on Ubuntu 9.10. It's using an EBS Raid array for the data storage. We already use skip name resolve and bind to address 0.0.0.0. This is a stub of the PHP code that's failing $tmp = mysqli_init(); $start_time = microtime(true); $tmp-options(MYSQLI_OPT_CONNECT_TIMEOUT, 2); $tmp-real_connect($DB_SERVERS[$server]['server'], $DB_SERVERS[$server]['username'], $DB_SERVERS[$server]['password'], $DB_SERVERS[$server]['schema'], $DB_SERVERS[$server]['port']); if(mysqli_connect_errno()){ $timer = microtime(true) - $start_time; mail($errors_to,'DB connection error',$timer); } There's more than 300Mb available on the DB server for new connections and the server is nowhere near the max allowed (60 of 1,200). Loading on both servers is < 2 on 4 core m1.xlarge instances. Some highlights from the mysql config max_connections = 1200 thread_stack = 512K thread_cache_size = 1024 thread_concurrency = 16 innodb-file-per-table innodb_additional_mem_pool_size = 16M innodb_buffer_pool_size = 13G Any help on tracing the source of the slowdown is appreciated. [EDIT] I have been updating the sysctl values for the network but they don't seem to be fixing the problem. I made the following adjustments on both the database and application servers. net.ipv4.tcp_window_scaling = 1 net.ipv4.tcp_sack = 0 net.ipv4.tcp_timestamps = 0 net.ipv4.tcp_fin_timeout = 20 net.ipv4.tcp_keepalive_time = 180 net.ipv4.tcp_max_syn_backlog = 1280 net.ipv4.tcp_synack_retries = 1 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 87380 16777216 [EDIT] Per jaimieb's suggestion, I added some tracing and captured the following data using time. This server handles about 51 queries/second at this the time of day. The connection error was raised once (at 13:06:36) during the 3 minute window outlined below. Since there was 1 failure and roughly 9,200 successful connections, I think this isn't going to produce anything meaningful in terms of reporting. Script: date /root/database_server.txt (time mysql -h database_Server -D schema_name -u appuser -p apppassword -e '') /dev/null 2 /root/database_server.txt Results: === Application Server 1 === Mon Feb 22 13:05:01 EST 2010 real 0m0.008s user 0m0.001s sys 0m0.000s Mon Feb 22 13:06:01 EST 2010 real 0m0.007s user 0m0.002s sys 0m0.000s Mon Feb 22 13:07:01 EST 2010 real 0m0.008s user 0m0.000s sys 0m0.001s === Application Server 2 === Mon Feb 22 13:05:01 EST 2010 real 0m0.009s user 0m0.000s sys 0m0.002s Mon Feb 22 13:06:01 EST 2010 real 0m0.009s user 0m0.001s sys 0m0.003s Mon Feb 22 13:07:01 EST 2010 real 0m0.008s user 0m0.000s sys 0m0.001s === Database Server === Mon Feb 22 13:05:01 EST 2010 real 0m0.016s user 0m0.000s sys 0m0.010s Mon Feb 22 13:06:01 EST 2010 real 0m0.006s user 0m0.010s sys 0m0.000s Mon Feb 22 13:07:01 EST 2010 real 0m0.016s user 0m0.000s sys 0m0.010s [EDIT] Per a suggestion received on a LinkedIn question, I tried setting the back_log value higher. We had been running the default value (50) and increased it to 150. We also raised the kernel value /proc/sys/net/core/somaxconn (maximum socket connections) to 256 on both the application and database server from the default 128. We did see some elevation in processor utilization as a result but still received connection timeouts.

    Read the article

  • Unable to access MySQL from MyPHPAdmin after setting root password in EasyPHP{WAMP}

    - by Codex
    Am a new starter with WAMP and trying to play around my way using the EasyPHP setup. After successful setup on intial launch of MySQL, the page prompted me to set up ROOT password for security reasons. On setting the password, am no longer able to access MySQL. The error is : Error MySQL said: Documentation 1045 - Access denied for user 'root'@'localhost' (using password: NO) Looked up on the net and tried the following options in the config.inc.php from the phpmyadmin foler: 1] Set the authetication to "http" so that it prompts to enter the username and password /* Authentication type */ $cfg['Servers'][$i]['auth_type'] = 'http'; 2] Set up the correct password in the config file $cfg['Servers'][$i]['password'] = 'myPwd'; None of them worked. Can anyone suggest a workaround to access MySQL? Am not fussed about not being able to use the root account but would like to CRUD on the database using other username. Thanks in advance.

    Read the article

  • Mysql server update cause error in php myadmin.

    - by Avinash
    Hi I have updated my mysql server from 5.0 to 5.1.x. before it works fine, but after upgrading its displaying error in my phpmyadmin. Error is as below: "Your PHP MySQL library version 5.0.51a differs from your MySQL server version 5.1.45. This may cause unpredictable behavior." I am not getting what to do with this. Hope i am clear to all. Thanks in advance Avinash

    Read the article

  • mysql query using jdbc

    - by S.PRATHIBA
    Hi all, I need to retrieve the last 20 values from my database.For example I have the following table Service_ID Service_Type consumer_feedback | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 36 | Printer | 1 | | 36 | Printer | 0 | | 37 | Printer | 0 | | 39 | Printer | -1 | | 39 | Printer | 0 | | 40 | Printer | 0 | I need to retrieve last 10 values from the table.I need to do the operation using jdbc.I have attached the sample code.Kindly help me. import java.io.; import java.sql.; public class CountRows2 { public static void main(String[] args) { System.out.println("Count number of rows in a specific table!"); Connection con = null; int count = 0; try{ Class.forName("com.mysql.jdbc.Driver"); con = DriverManager.getConnection ("jdbc:mysql://localhost:3306/prathi","root","mysql"); try{ Statement st = con.createStatement(); ResultSet res1 = st.executeQuery("SELECT COUNT(*) FROM consumer1" ); while (res1.next()){ count = res1.getInt(1); } System.out.println("Number of column:"+count); } catch (SQLException s){ System.out.println("SQL statement is not executed!"); } } catch (Exception e){ e.printStackTrace(); } try{ Class.forName("com.mysql.jdbc.Driver"); con = DriverManager.getConnection ("jdbc:mysql://localhost:3306/prathi","root","mysql"); try{ Statement st = con.createStatement(); ResultSet res1 = st.executeQuery("SELECT * FROM consumer1 LIMIT count-10,10"); while (res1.next()){ int Service = res1.getInt(1); String s1 = res1.getString(2); int feedback=res1.getInt(3); } System.out.println("Service" + " " +"s1" + " " +"feedback"); } catch (SQLException s){ System.out.println("SQL statement is not executed!"); } } catch (Exception e){ e.printStackTrace(); } } } I am getting the output as: C:javac CountRows2.java C:java CountRows2 Count number of rows in a specific table! Number of column:558 SQL statement is not executed! Thanks a lot....

    Read the article

  • 'undefined method init for Mysql:Class'

    - by sscirrus
    I've been having problems with a MySQL Server installation that got messed up after a power outage. Configuration Intel i5 Mac running OS X 10.6.5 Ruby 1.9.2 installed Rails 3.0.1 installed MySQL Server (finally) installed and running I completely reinstalled MySQL, which deleted the local development/test/production databases. So, I have run create database development; in MySQL to get the dev database ready for a migration. Current Goal Run rake db:migrate to get my databases back again. (I cannot currently access my databases or Mysql at all from Rails.) Error Using the gem 'mysql', '2.8.1' and run rake db:migrate, I get the error: rake aborted! undefined method 'init' for Mysql:Class Stack Trace: /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/mysql_adapter.rb:30:in 'mysql_connection' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:230:in 'new_connection' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:238:in 'checkout_new_connection' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:194:in 'block (2 levels) in checkout' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in 'loop' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in 'block in checkout' /Users/sscirrus/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/monitor.rb:201:in 'mon_synchronize' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:189:in 'checkout' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:96:in 'connection' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:318:in 'retrieve_connection' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_specification.rb:97:in 'retrieve_connection' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/connection_adapters/abstract/connection_specification.rb:89:in 'connection' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/migration.rb:486:in 'initialize' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/migration.rb:433:in 'new' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/migration.rb:433:in 'up' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/migration.rb:415:in 'migrate' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/activerecord-3.0.1/lib/active_record/railties/databases.rake:142:in 'block (2 levels) in <top (required)>' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:636:in 'call' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:636:in 'block in execute' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:631:in 'each' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:631:in 'execute' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:597:in 'block in invoke_with_call_chain' /Users/sscirrus/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/monitor.rb:201:in 'mon_synchronize' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:590:in 'invoke_with_call_chain' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:583:in 'invoke' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:2051:in 'invoke_task' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:2029:in 'block (2 levels) in top_level' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:2029:in 'each' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:2029:in 'block in top_level' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:2068:in 'standard_exception_handling' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:2023:in 'top_level' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:2001:in 'block in run' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:2068:in 'standard_exception_handling' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/lib/rake.rb:1998:in 'run' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/gems/rake-0.8.7/bin/rake:31:in '<top (required)>' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/bin/rake:19:in 'load' /Users/sscirrus/.rvm/gems/ruby-1.9.2-p0/bin/rake:19:in '<main>'

    Read the article

  • Random select rows via JPA

    - by Ke
    In Mysql, SELECT id FROM table ORDER BY RANDOM() LIMIT 5 this sql can select 5 random rows. How to do this via JPA Query (Hibernate as provider, Mysql database)? Thanks.

    Read the article

< Previous Page | 76 77 78 79 80 81 82 83 84 85 86 87  | Next Page >