mysql table - Page 43 - Developer IT

php / mysql - select id from one table excepting ids which are in second table

- by John

hello. for example i have 2 tables: 1 . users: id Name 1 Mike 2 Adam 3 Tom 4 John 5 Andy 6 Ray 2 . visits: userID date 1 ... 3 ... 6 ... i want to make a page which can be visited once in 12 hours, when user visits that page his id is included in database ( visits ), how i can select all users ( from database users) excepting users who visited page in <= 12 hours ( users from database visits )?

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I have created a PHP script and I am lacking to extract the primary key, I have given flow below, pl

- by Parth

I am using MySQL DB, working for Joomla, My requirement is tracking the activity like insert/update/delete on any table and store it in another audit table using triggers, i.e. I am doing Auditing. DB's table structure: Few tables dont have any PK nor auto increment key Flow of my script is : I fetch out all table from DB. I check whether the table have any trigger or not. If yes then it moves to check nfor next table and so on. If it does'nt find any trigger then it creates the triggers for the table, such that, -it first checks if the table has any primary key or not(for inserting in Tracking audit table for every change made) if it has the primary key then it uses it further in creation of trigger. if it doesnt find any PK then it proceeds further in creating the trigger without inserting any id in audit table Now here, My problem is I need the PK every time so that I can record the id of any particular table in which the insert/update/delete is performed, so that further i can use this audit track table to replicate in production DB.. Now as I haave mentioned earlier that I am not available with PK/auto-incremented in some table, then what should I do get the particular id in which change is done? please guide me...GEEKS!!!

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MYSQL: Limit Word Length for MySql Insert

- by elmaso

Hi, every search query is saved in my database, but I want to Limit the Chracterlength for one single word: odisafuoiwerjsdkle -- length too much -- dont write in the database my actually code is: $search = $_GET['q']; if (!($sql = mysql_query ('' . 'SELECT * FROM `history` WHERE `Query`=\'' . $search . '\''))) { exit ('<b>SQL ERROR:</b> 102, Cannot write history.'); ; } while ($row = mysql_fetch_array ($sql)) { $ID = '' . $row['ID']; } if ($ID == '') { mysql_query ('' . 'INSERT INTO history (Query) values (\'' . $search . '\')'); } if (!($sql = mysql_query ('SELECT * FROM `history` ORDER BY `ID` ASC LIMIT 1'))) { exit ('<b>SQL ERROR:</b> 102, Cannot write history.'); ; } while ($row = mysql_fetch_array ($sql)) { $first_id = '' . $row['ID']; } if (!($sql = mysql_query ('SELECT * FROM `history`'))) { exit ('<b>SQL ERROR:</b> 102, Cannot write history.'); ; }

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Select 2 Rows from Table when COUNT of another table

- by Marcus

Here is the code that I currently have: SELECT `A`.* FROM `A` LEFT JOIN `B` ON `A`.`A_id` = `B`.`value_1` WHERE `B`.`value_2` IS NULL AND `B`.`userid` IS NULL ORDER BY RAND() LIMIT 2 What it currently is supposed to do is select 2 rows from A when the 2 rows A_id being selected are not in value_1 or value_2 in B. And the rows in B are specific to individual users with userid. What I need to do is make it also so that also checks if there are already N rows in B matching a A_id (either in value_1, or value_2) and userid, and if there are more than N rows, it doesn't select the A row.

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Getting a table cell to become a different color on mouseover

- by Andrei Korchagin

Currently, when I create a table, and I mouseover a cell, that entire row is highlighted. I'm trying to make it so that it is only the immediate cell. Here's all the CSS code that pertains to tables in my stylesheet: table{margin:.5em 0 1em;} table td,table th{text-align:center;border-right:1px solid #fff;padding:.4em .8em;} table th{background-color:#5e5e5e;color:#fff;text-transform:uppercase;font-weight:bold;border- bottom:1px solid #e8e1c8;} table td{background-color:#eee;} table th a{color:#d6f325;} table th a:hover{color:#fff;} table tr.even td{background-color:#ddd;} table tr:hover td{background-color:#fff;} table.nostyle td,table.nostyle th,table.nostyle tr.even td,table.nostyle tr:hover td{border:0;background:none;background-color:transparent;} I know it's probably a simple fix but I can't find where to make it work. Everything I try just kills the mouseover effect entirely rather than making it the way I want it. Thanks in advance!

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How to display how many times each records in a table used by other table

- by Fredy

I have a problem with my query, below are two tables that tbl_tag and tbl_tag_usedby. I want to show how much of each record in tbl_tag used by record in tbl_tag_usedby. Here is a query that I use: SELECT t.*, COUNT(u.tagid) AS totale FROM tbl_tag t LEFT JOIN tbl_tag_usedby u ON u.tagid = t.id AND t.status =1 GROUP BY u.tagid and the results are as below: In this case the record id from 2 to 6 do not appear in the query results, I want record id from 2 to 6 are also shown and on the field "totale" its value is 0. Can anyone help me?

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mysql query trying to search by alias involving CASES and aggregate functions UGH!

- by dqhendricks

I have two tables left joined. The query is grouped by the left table's ID column. The right table has a date column called close_date. The problem is, if there are any right table records that have not been closed (thus having a close_date of 0000-00-00), then I do not want any of the left table records to be shown, and if there are NO right table records with a close_date of 0000-00-00, I would like only the right table record with the MAX close date to be returned. So for simplicity sake, let's say the tables look like this: Table1 id 1 2 Table2 table1_id | close_date 1 | 0000-00-00 1 | 2010-01-01 2 | 2010-01-01 2 | 2010-01-02 I would like the query to only return this: Table1.id | Table2.close_date 2 | 2010-01-02 I tried to come up with an answer using aliased CASES and aggregate functions, but I could not search by the result, and I was attempting not to make a 3 mile long query to solve the problem. I looked through a few of the related posts on here, but none seem to meet the criteria of this particular case. Any pushes in the right direction would be greatly appreciated. Thanks!

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How to combine two rows and calculate the time difference between two timestamp values in MySQL?

- by Nadar

I have a situation that I'm sure is quite common and it's really bothering me that I can't figure out how to do it or what to search for to find a relevant example/solution. I'm relatively new to MySQL (have been using MSSQL and PostgreSQL earlier) and every approach I can think of is blocked by some feature lacking in MySQL. I have a "log" table that simply lists many different events with their timestamp (stored as datetime type). There's lots of data and columns in the table not relevant to this problem, so lets say we have a simple table like this: CREATE TABLE log ( id INT NOT NULL AUTO_INCREMENT, name VARCHAR(16), ts DATETIME NOT NULL, eventtype VARCHAR(25), PRIMARY KEY (id) ) Let's say that some rows have an eventtype = 'start' and others have an eventtype = 'stop'. What I want to do is to somehow couple each "startrow" with each "stoprow" and find the time difference between the two (and then sum the durations per each name, but that's not where the problem lies). Each "start" event should have a corresponding "stop" event occuring at some stage later then the "start" event, but because of problems/bugs/crashed with the data collector it could be that some are missing. In that case I would like to disregard the event without a "partner". That means that given the data: foo, 2010-06-10 19:45, start foo, 2010-06-10 19:47, start foo, 2010-06-10 20:13, stop ..I would like to just disregard the 19:45 start event and not just get two result rows both using the 20:13 stop event as the stop time. I've tried to join the table with itself in different ways, but the key problems for me seems to be to find a way to correctly identify the corresponding "stop" event to the "start" event for the given "name". The problem is exactly the same as you would have if you had table with employees stamping in and out of work and wanted to find out how much they actually were at work. I'm sure there must be well known solutions to this, but I can't seem to find them...

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Multisite Enabling a Table

- by Joe Fitzgibbons

I am creating a table (table A) that will have a number of columns(of course) and there will be another table (table B) that holds metadata associated to rows in table A. I am working with a multi site implementation that has one database for the whole shabang. Rows in table A could belong to any number of sites but must belong to at least one. The problem I have is I am not sure what the best practice is for defining what site each row in table A belongs to. I want performance and scalability. There is no finite number of sites going forward. Rows in table A could belong to any number of sites in the future. Right now there are only 3. My initial thoughts are to have a primary site ID in Table A and then metadata in table B will have rows defining additional sites as needed. Another thought is to have a column in Table A for each site and it is a boolean as to wether it belongs to that site. Lastly I have thought about having another table to map rows in Table A to each site. What is the best way to associate rows in a table with any number of sites with performance and scalability in mind?

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delete records from a table based on data from a different table

- by every_answer_gets_a_point

table1 has column CITY and COUNTRY. table2 has column CITY. how do i delete from table2 all records that have CITY in common with table1 but also the COUNTRY='Russia' ?? please keep in mind that both tables have about 1 million rows of data

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How can I get MySQL 5.5 to log warnings to one of the log files?

- by Wodin

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MySQL reserves too much RAM

- by Buddy

I have a cheap VPS with 128Mb RAM and 256Mb burst. MySQL starts and reserves about 110Mb, but uses not more than 20Mb of them. My VPS Control Panel shows, that I use 127Mb (I also running nginx and sphinx), I know, that it shows reserved RAM, but when I reach over 128Mb, my VPS reboots automatically every 4 hours. So I want to force MySQL to reserve less RAM. How can i do that? I did some tweaks with my.conf but it helped not so much. top output: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 15 0 2156 668 572 S 0.0 0.3 0:00.03 init 11311 root 15 0 11212 356 228 S 0.0 0.1 0:00.00 vzctl 11312 root 18 0 3712 1484 1248 S 0.0 0.6 0:00.01 bash 11347 root 18 0 2284 916 732 R 0.0 0.3 0:00.00 top 13978 root 17 -4 2248 552 344 S 0.0 0.2 0:00.00 udevd 14262 root 15 0 1812 564 472 S 0.0 0.2 0:00.03 syslogd 14293 sphinx 15 0 11816 1172 672 S 0.0 0.4 0:00.07 searchd 14305 root 25 0 7192 1036 636 S 0.0 0.4 0:00.00 sshd 14321 root 25 0 2832 836 668 S 0.0 0.3 0:00.00 xinetd 15389 root 18 0 3708 1300 1132 S 0.0 0.5 0:00.00 mysqld_safe 15441 mysql 15 0 113m 16m 4440 S 0.0 6.4 0:00.15 mysqld 15489 root 21 0 13056 1456 340 S 0.0 0.6 0:00.00 nginx 15490 nginx 18 0 13328 2388 992 S 0.0 0.9 0:00.06 nginx 15507 nginx 25 0 19520 5888 4244 S 0.0 2.2 0:00.00 php-cgi 15508 nginx 18 0 19636 4876 2748 S 0.0 1.9 0:00.12 php-cgi 15509 nginx 15 0 19668 4872 2716 S 0.0 1.9 0:00.11 php-cgi 15518 root 18 0 4492 1116 568 S 0.0 0.4 0:00.01 crond MySQL tuner: >> MySQLTuner 1.0.1 - Major Hayden <[email protected]> >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering Please enter your MySQL administrative login: root Please enter your MySQL administrative password: -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.0.77 [OK] Operating on 32-bit architecture with less than 2GB RAM -------- Storage Engine Statistics ------------------------------------------- [--] Status: -Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in InnoDB tables: 1M (Tables: 1) [OK] Total fragmented tables: 0 -------- Performance Metrics ------------------------------------------------- [--] Up for: 38m 43s (37 q [0.016 qps], 20 conn, TX: 4M, RX: 3K) [--] Reads / Writes: 100% / 0% [--] Total buffers: 28.1M global + 832.0K per thread (100 max threads) [OK] Maximum possible memory usage: 109.4M (42% of installed RAM) [OK] Slow queries: 0% (0/37) [OK] Highest usage of available connections: 1% (1/100) [OK] Key buffer size / total MyISAM indexes: 128.0K/64.0K [OK] Query cache efficiency: 42.1% (8 cached / 19 selects) [OK] Query cache prunes per day: 0 [!!] Temporary tables created on disk: 27% (3 on disk / 11 total) [!!] Thread cache is disabled [OK] Table cache hit rate: 57% (8 open / 14 opened) [OK] Open file limit used: 1% (12/1K) [OK] Table locks acquired immediately: 100% (22 immediate / 22 locks) [!!] Connections aborted: 10% [OK] InnoDB data size / buffer pool: 1.5M/8.0M -------- Recommendations ----------------------------------------------------- General recommendations: MySQL started within last 24 hours - recommendations may be inaccurate Enable the slow query log to troubleshoot bad queries When making adjustments, make tmp_table_size/max_heap_table_size equal Reduce your SELECT DISTINCT queries without LIMIT clauses Set thread_cache_size to 4 as a starting value Your applications are not closing MySQL connections properly Variables to adjust: tmp_table_size (> 32M) max_heap_table_size (> 16M) thread_cache_size (start at 4) I think if I do what MySQLtuner says, MySQL will use more RAM.

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The penultimate audit trigger framework

- by Piotr Rodak

So, it’s time to see what I came up with after some time of playing with COLUMNS_UPDATED() and bitmasks. The first part of this miniseries describes the mechanics of the encoding which columns are updated within DML operation. The task I was faced with was to prepare an audit framework that will be fairly easy to use. The audited tables were to be the ones directly modified by user applications, not the ones heavily used by batch or ETL processes. The framework consists of several tables and procedures...(read more)

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Can't get lines around table borders/cells [migrated]

- by Ira Baxter

I have several web pages containing tables, for which I'd like to have line-borders around the tables and the cells. In fact, some of these pages existed for several years already, and rendered acceptly in IE6, IE7. We switched about 6 months ago to a completely different set of style sheets to change our site look and feel. We also switched to "modern" browsers such as IE8 (and because I couldn't stop Vista) to IE9. Now the borders don't render at all. I spent a day fighting with this about a month ago, and failed to fix it. It seemed that I could reduce the page down to just the barest table and IE8 would still not render the border. I think I decided IE8 was just buggy, but I'm not an HTML expert so it is more likely that I'm buggy. (I'm just getting back to this; I'll go see if I can find that reduced page). Here is one such page: http://www.semdesigns.com/products/DMS/DMSComparison.html The tables should be obvious; you can tell them by their absence of lines :-{ The URI validates using the W3C service as HTML 4.01 Transitional. Any suggestions?

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Overlap of the variable in mysql, my column are set to my query result

- by foodil

The question is not clear , let me clarify it: try{ $sql = ' SELECT UserID <==== (***********Used here for query ******) FROM user WHERE Rights != ?'; $stmt = $conn->prepare($sql); $stmt->execute(array('admin')); $result= $stmt->fetchAll(); } catch(PDOException $e) { die ($e->getMessage().'<a href="add.php"> Back</a>'); } foreach ($result as $set) { if ($set['UserID']==$_SESSION['username']) $rights='edit'; else {$rights=$_POST[$set['UserID']];} if (($rights != 'default' || $set['UserID']==$_SESSION['username']) && $_POST['public']==0 ) { $user=$set['UserID']; try { $query="INSERT INTO user_list(UserID <==== (***********Used here for insert ******),ListID,UserRights) VALUES ($user,$lastID,$rights)"; $stmt = $conn->prepare($query); $stmt->execute(); } catch(PDOException $e) { die ($e->getMessage().'<a href="add.php"> Back</a>'); $conn->rollBack(); } } } As you can see the UserID is a query result but it is also the column i need to insert, so when i insert into the table it will casued an error SQLSTATE[42S22]: Column not found: 1054 Unknown column 'UserA_ID' in 'field list' because the column is modify by my query result from: $query="INSERT INTO user_list(UserID,ListID,UserRights) VALUES ($user,$lastID,$rights)"; to: $query="INSERT INTO user_list(query_result_id,ListID,UserRights) VALUES ($user,$lastID,$rights)"; How to fix it ?Thank you.

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How can I get cross-browser consistent behavior for TR heights within a table with a set height? [migrated]

- by Dan

I have an arbitrary number of tables with an arbitrary number of rows in each, and all tables are the same height. My initial approach was to just set the overall height of the table and hope the rows were smart enough to distribute themselves appropriately. That's not the case. I have 4 different behaviors going on with 4 browsers, but I need them to all render at the very least in a similar way. Safari & Chrome (WebKit): All rows are equal height, creating scroll bars as needed and fitting within table height. Firefox: All rows are the height necessary to fit their content, with the remaining rows overflowing out of the table. Additionally, If the content of the rows does not take up all of the height, only the part of the table with content in it takes the background (though it seems, through use of Firebug, that the actual table [and TR] extend to the bottom of the proper table height). IE: All rows are the height necessary to fit their content, with the remaining rows overflowing out of the table. Obviously this only includes one version of each browser and additional variation would likely appear with more being tested. Ideally, a solution where the browser renders TRs with less content smaller than those with larger content, while still using scrolling within the variable height TRs when the overall height of the table is not enough would be optimum. I could potentially see a solution to achieve that with JS, but can it be done with CSS? Or, if not, can the behavior that WebKit displays be made to work across the browsers? Thanks! PS: Example can be found here.

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???????/???MySQL?????

- by Yusuke.Yamamoto

????? ??:2011/07/25 ??:??????/?? Web??????????????????????????? MySQL ????????????????????MySQL ???????????????? MySQL / MySQL Server ????MySQL ????????????MySQL???????&????????? / ?????·?????????·?????????????????????MySQL ???????????????MySQL Server ???????????????????&???????????InnoDB ???????TipsMySQL ???? ????????? ????????????????? http://otndnld.oracle.co.jp/ondemand/otn-seminar/movie/20110725MySQL_Overview.wmv http://www.oracle.com/technetwork/jp/ondemand/db-new/20110725-ou-overview-455758-ja.pdf

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Mysql PHP generated table: doesn't work with Tablesorter

- by echedey lorenzo

Hi, I found this great Tablesorter plugin for jQuery but I can't make it work with my PHP generated table. Here's the code: <script type="text/javascript"> function table() { $("#container").load("table.php?randval="+Math.random()); } $(document).ready(function() { table(); $("table").tablesorter(); }); </script> Where #container is the div where the table will be and table is the name of the table. I get the table loaded but sorting function is not working. It works if I put the table directly in html in the page.. but I don't see the point in having a static table for sorting. Any help would be very appreciated.

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mysql weird connection problem

- by santiago.basulto

Hi guys! I've a weird problem. I've mysql 5.1 installed on my ubuntu 9.04. I've used it a long time (say 3 month) and everything was going right. Until i faced this really weird problem. When i want to connect to a random database i get this message: ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 1 Current database: test_cake ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111) ERROR: Can't connect to the server It only happens with some databases, while others are totally usefull and healthy. After that, if i try to restart the server i get this. shell /etc/init.d/mysql restart * Stopping MySQL database server mysqld cat: /var/run/mysqld/mysqld.pid: Permiso denegado [fail] * Starting MySQL database server mysqld cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado cat: /var/run/mysqld/mysqld.pid: Permiso denegado [fail] ("permiso denegado" is "permission denied"). I don't know what to do. I change the /var/run/mysqld/mysqld.pid attributes but still not working. Can anybody help me ?

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mysqladmin - Unknown MySQL server host

- by ert

I'm trying to connect to a mysql server over a local network. The server is running and listening to post 41322. dylan~$ netstat -ln | s mysql unix 2 [ ACC ] STREAM LISTENING 41322 /var/run/mysqld/mysqld.sock My user is granted all rights from all addresses, and I can log in locally. dylan~$ mysqladmin -P 41322 -h [email protected] create database test mysqladmin: connect to server at '[email protected]' failed error: 'Unknown MySQL server host '[email protected]' (1)' Check that mysqld is running on [email protected] and that the port is 41322. You can check this by doing 'telnet [email protected] 41322' Adding a --verbose flag gives no additional output. I've commented out bind-address=127.0.0.1 in /etc/mysql/my.cnf on the server. I can ssh into the server without a problem. dylan~$ ps a | grep mysql 11131 pts/3 S 0:00 /bin/sh /usr/bin/mysqld_safe 11170 pts/3 Sl 0:03 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --skip-external-locking --port=3306 --socket=/var/run/mysqld/mysqld.sock 11171 pts/3 S 0:00 logger -p daemon.err -t mysqld_safe -i -t mysqld 13710 pts/1 S+ 0:00 grep mysq Any help or thoughts are appreciated.

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MySQL socket connections working, but not port connections

- by Neil

I installed MySQL community 5.1.45 on my Snow Leopard 10.6, using the pkg from their site. I had previously installed a MySQL binary from entropy.ch. In the previous installation, the connections were working fine before I upgrade to Snow Leopard. In Snow Leopard, both the installations are problematic. Using an app called Sequel Pro, if I connect with the socket operation, it connects properly. However, a standard connection with the same credentials doesn't work. From what I've understood, socket connections happen on the machine itself between processes, whereas normal connections occur over the network/ports, in this case a loopback to my machine, since the server and client are both on the same machine. My new CakePHP installation isn't being able to connect to the db with the root credentials I provided. Btw, I've been starting the MySQL server using the Preference Pane. When I tried running mysqld from terminal, it gave me: 100323 1:54:37 [Warning] Can't create test file /usr/local/mysql-5.1.45-osx10.6-x86_64/data/mbp.lower-test 100323 1:54:37 [Warning] Can't create test file /usr/local/mysql-5.1.45-osx10.6-x86_64/data/mbp.lower-test mysqld: Can't change dir to '/usr/local/mysql-5.1.45-osx10.6-x86_64/data/' (Errcode: 13) 100323 1:54:37 [ERROR] Aborting 100323 1:54:37 [Note] mysqld: Shutdown complete mbp is the name of my machine. How do I fix this so that my webserver can connect to the mysql server?

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django, mod_wsgi, MySQL High CPU - Problems

- by Red Rover

Good Evening, and thank you for reading this post. I am having a problem with Django after migrating the dB from SQLlite to MySQL. Initially, for the first 48hours, all ran well. But now we are experiencing high cpu about every 30 minutes. This is a production ESX4i VM host, with 2 x 2.8 ghz CPUs and 12 GB ram. I have allocated 4 cpu's to this VM and 4 GB memory. Any insight into this configuration and help with the spikes in CPU would be appreciated. IT is configured to use the prefork MPM. Outlined are the config's for the different services: MySQL Server version: 5.1.61 Source distribution Django 1.3 mod_wsgi Apache/2.2.15 httpd.conf Timeout 120 KeepAlive Off MaxKeepAliveRequests 400 KeepAliveTimeout 3 prefork MPM StartServers 8 MinSpareServers 8 MaxSpareServers 16 ServerLimit 40 MaxClients 40 MaxRequestsPerChild 0 worker MPM StartServers 16 MaxClients 1024 MinSpareThreads 64 MaxSpareThreads 256 ThreadsPerChild 64 MaxRequestsPerChild 10240 MySQL my.conf [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql symbolic-links=0 [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid my.cnf wsgi.conf LoadModule wsgi_module modules/mod_wsgi.so /etc/httpd/conf.d/wsgi.conf WSGISocketPrefix /var/run/wsgi WSGIPythonEggs /var/tmp WSGIDaemonProcess SITE maximum-requests=10000 WSGIProcessGroup SITE

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Slow performance of MySQL database on one server and fast on another one, with similar configurations

- by Alon_A

We have a web application that run on two servers of GoDaddy. We experince slow preformance on our production server, although it has stronger hardware then the testing one, and it is dedicated. I'll start with the configurations. Testing: CentOS Linux 5.8, Linux 2.6.18-028stab101.1 on i686 Intel(R) Xeon(R) CPU L5609 @ 1.87GHz, 8 cores 60 GB total, 6.03 GB used Apache/2.2.3 (CentOS) MySQL 5.5.21-log PHP Version 5.3.15 Production: CentOS Linux 6.2, Linux 2.6.18-028stab101.1 on x86_64 Intel(R) Xeon(R) CPU L5410 @ 2.33GHz, 8 cores 120 GB total, 2.12 GB used Apache/2.2.15 (CentOS) MySQL 5.5.27-log - MySQL Community Server (GPL) by Remi PHP Version 5.3.15 We are running the same code on both servers. The Problem We have some function that executes ~30000 PDO-exec commands. On our testing server it takes about 1.5-2 minutes to complete and our production server it can take more then 15 minutes to complete. As you can see here, from qcachegrind: Researching the problem, we've checked the live graphs on phpMyAdmin and discovered that the MySQL server on our testing server was preforming at steady level of 1000 execution statements per 2 seconds, while the slow production MySQL server was only 250 executions statements per 2 seconds and not steady at all, jumping from 0 to 250 every seconds. You can clearly see it in the graphs: Testing server: Production server: You can see here the comparison between both of the configuration of the MySQL servers.Left is the fast testing and right is the slow production. The differences are highlighted, but I cant find anything that can cause such a behavior difference, as the configs are mostly the same. Maybe you can see something that I cant see. Note that our tables are all InnoDB, so the MyISAM difference is (probably) not relevant. Maybe it is the MySQL Community Server (GPL) that is installed on the production server that can cause the slow performance? Or maybe it needs to be configured differently for 64bit ? I'm currently out of ideas...

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installed mysql using yum but mysqld dowsnt start: Fedora 16

- by Sumit Singh Bir

i installed mysql mysql-server and mysql-libs ... after installation i thought to start the mysql service using command systemctl start mysqld.service Failed to issue method call: Unit mysqld.service failed to load: Invalid argument. See system logs and 'systemctl status mysqld.service' for details. systemctl status mysqld.service this said that it had an invalid argument then i changed the content of mysqld.service with this File: /etc/systemd/system/mysqld.service [Unit] Description=MySQL database server After=syslog.target After=network.target [Service] User=mysql Group=mysql ExecStart=/usr/sbin/mysqld --pid-file=/var/run/mysqld/mysqld.pid ExecStop=/bin/kill -15 $MAINPID PIDFile=/var/run/mysqld/mysqld.pid # We rely on systemd, not mysqld_safe, to restart mysqld if it dies Restart=always # Place temp files in a secure directory, not /tmp PrivateTmp=true [Install] WantedBy=multi-user.target now i found that the error for invalid argument was resolved and mysqld.service was loaded but not enabled ... using systemctl start mysqld.service worked fine ... it workedddd! but then enabling it systemctl enable mysqld.service or service mysqld start did not do anything but the curdor kept on blinking after i pressed enter ... now the thing is that for this f16 i wasted my HDD space for development work and i cannot figure out a way ... please somebody help

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How to Set up MySQL Server to utilize more memory

- by Cyril Gupta

Hi there, I have MySQL setup on Windows along with Plesk. The version is 5.0.45 Community. The databases I have on the server are MyISAM as well as InnoDb, but predominantly innodb. I had 8G memory on my server, but MySQL isn't going up more than 1.3G and tweaking the settings isn't helping. I tried to increase the memory allocation for innodb_buffer_pool_size, it works if I set it up to 1G, but if I set 2G, or above the server doesn't come back online! I want mySQL to use at least 5-6 Gigs of the memory I have for performance, but I can't get this to work. Can anyone please help? My mysql config file is below (there are 2 mysqld sections... when i used MySQL workbench it created another one!) [MySQLD] port=3306 basedir=C:\\Program Files (x86)\\Parallels\\Plesk\\Databases\\MySQL datadir=C:\\Program Files (x86)\\Parallels\\Plesk\\Databases\\MySQL\\Data default-character-set=latin1 default-storage-engine=INNODB query_cache_size=128M table_cache=1024 tmp_table_size=32M thread_cache=32 myisam_max_sort_file_size=100G myisam_max_extra_sort_file_size=100G myisam_sort_buffer_size=2M key_buffer_size=32M read_buffer_size=16M read_rnd_buffer_size=2M sort_buffer_size=8M innodb_additional_mem_pool_size=24M innodb_flush_log_at_trx_commit=1 innodb_log_buffer_size=10M innodb_buffer_pool_size=1G innodb_log_file_size=10M innodb_thread_concurrency=8 max_connections=700 key_buffer=48M max_allowed_packet=5M sort_buffer=2M net_buffer_length=4K old_passwords=1 wait_timeout=20 connect_timeout=60 [client] port=3306 [mysqld] query_cache_min_res_unit = 4096 innodb_additional_mem_pool_size = 1048576 innodb_buffer_pool_size = 1G query_cache_limit = 1048576 key_buffer_size = 8388608 sort_buffer_size = 2097144 query_cache_type = 1 query_cache_size = 312M log-slow-queries connect_timeout = 5 wait_timeout = 20 thread_cache_size = 15 read_buffer_size = 131072 table_cache = 64

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