mysql fetching takes too long

MySQL taking a long time to start. This topic is now archived and is closed to further replies. Ask Question Asked 10 years, 8 months ago. The default behavior is generally to fetch the whole result and buffer it in memory. Set slow_query_log_file to the path where you want to save the file. mysql_unbuffered_query() sends the SQL query query to MySQL without automatically fetching and buffering the result rows as mysql_query() does. If no results found for the query, then mysqli_fetch_row() will return NULL. If logging reveals that individual queries are taking too long, you’d need a breakdown of how much time was spent within the database processing the query, sending results over the network, being handled by the DBAPI, and finally being received by SQLAlchemy’s result set and/or ORM layer. Millions of rows is fine, tens of millions of rows is fine - provided you've got an even remotely decent server, i.e. There is a wide array of possible reasons for this process to be slow. Then run your code and any query above the specified threshold will be added to that file. I'd archive older data when it reached that point. Active 5 years, 3 months ago. CMSDK - Content Management System Development Kit. INT − A normal-sized integer that can be signed or unsigned. 1,717 Views. Query taking longer time to execute have many parameters to look into for it’s better performance. Each of these stages can present their own individual bottlenecks, depending on specifics. I'm looking at indexing firstID and secondID but I need to rebuild the table now which takes the best part of a day. To use it, open the my.cnf file and set the slow_query_log variable to "On." However 64% of 10 minutes is still far too long. The query must have taken at least long_query_time seconds, or. Luckily you only have to create the index once. If you want a mysql transaction you need to SQLSetProp(h,"Transactions",2) and then end with SqlCommit(h) or SqlRollback(h). You may do your processes on Phpmyadmin manuelly or with Sql Code. 5:- Remove Unnecessary Table and index 6:- Remove OUTER JOINS. Up to a few minutes on a local setup. You should SET COVERAGE TO your.log and then see what line takes what time. 2. Portions of this website are copyright © 2001, 2002 The PHP Group, Page generated in 0.032 sec. MYSQL join taking too long to execute. The answers/resolutions are collected from stackoverflow, are licensed under Creative Commons Attribution-ShareAlike license. For example, you can  Slow query performance on large table with no unique keys. Let’s go through all the steps one by one. We’ve already mentioned this tip in our Magento Add to Cart slow guide. But basically the application is doing something that the database server doesn't like. I have an InnoDB database running as a Local Instance. Avoid using UPDATE instead of CASE. Load Data Infile takes a long time. You do a few quick searches and it seems to have a relationship with server-side cursors. 1.Query must be written in the proper manner. faster, more efficient and credible database queries, you need a fast SQL server. And the query is quite simple, which returns only ~17000 rows. There are also several settings that may help to improve fetch performance. There isn't one on your created  MySQL index creation, if it has to swap to disk, can take a loooong time, especially on hardware with insufficient RAM or slow disks, or when MySQL is configured to be stingy with its use of RAM from the OS. I'm running Windows Server 2008 with MySQL installed and every time I reboot the server the MySQL Service doesn't start right away. The fetch_row() / mysqli_fetch_row() function fetches one row from a result-set and returns it as an enumerated array. I would be glad if some of you can help me. So if the server isn't working particular hard (mysql isn't constantly at 100% CPU) you could say this is a misconfiguration. The idea is as follows. So if the server isn't working particular hard (mysql isn't constantly at 100% CPU) you could say this is a misconfiguration. share | improve this answer | follow | answered Nov 10 '17 at 12:21. ypercubeᵀᴹ ypercubeᵀᴹ. Test, However If possible i will try to normalize my table structure to reduce teh execution time further . the query isn't executed until you start fetching, the query "isn't fast and result set is slow" it is that the query takes a long time to complete - period. Regarding the record selection, if the fetch is limited, i.e. Avoid blind re-use of Code. By marz, September 21, 2010 in PHP Coding Help. Sometimes Internet Explorer opens it right away. I have a snippet of code like below : … Why a Query Takes Longer Time? If signed, the allowable range is from -2147483648 to 2147483647. Start new topic; Prev; 1; 2; Next; Page 1 of 2 . Ask Question Asked 4 years, Now I cannot get MySQL to use the cab index with that same query. When the user selects many checkboxes in each group, it takes too long for the sql-query to execute. MySQL has a built-in slow query log. Set long_query_time to the number of seconds that a query should take to be considered slow, say 0.2. How to speed up your MySQL queries 300 times, To ensure your MySQL server hums along at top speed, providing stable and and scalability of your RDBMS with these 21 rules for faster SQL queries. MySQL indexes may take up more space and decrease performance on inserts, deletes, and updates. MySQL Forums Forum List » Performance. Posted: Tue Apr 04, 2017 10:50 am . Some of the memory allocation per thread is done by MySQL itself for running complex processes/queries like “stored procedures” and it can take an unlimited amount of memory while running. What exactly takes long? SECTIONS. Table approximately has 300,00,000 rows. Recommended Posts. Learn how to speed it Use indexes to avoid unnecessary passes through tables. Some analytic and batch operations are supposed to be long running queries, so we can skip those for now. To use it, open the my.cnf file and set the slow_query_log variable to "On." MySQL Bugs: #65254: MySQL Fetching forever, 9 (GPL) of the MySQL Workbench. I have an InnoDB database running as a Local Instance. That last part might sound backward and nonintuitive. 89. to 1000K rows the information is displayed in a reasonable amount of time, if the limit is removed then it takes a long time of course, but at the end the information is displayed too. MySQL Server; 26 Comments. SELECT CONCAT ( 'SELECT `chef_orders_pending_temp`.item_id,`chef_orders_pending_temp`.itemName,`chef_orders_pending_temp`.order_date', GROUP_CONCAT ( ' , `t_', REPLACE (Outlet_name, '`', '``' ), '`.QtyRequested AS `', REPLACE (Outlet_name, '`', '``' ), '`' SEPARATOR '' ), ' FROM `chef_orders_pending_temp` ', GROUP_CONCAT ( ' LEFT JOIN `chef_orders_pending_temp` AS `t. Data is been fetched from 7 tables. No issues, I was amazed how well MySQL scaled to 8 million+ rows. A query is already optimized and indexed. My issue is that the "Fetch" time of the first query  Regarding the record selection, if the fetch is limited, i.e. However 300 seconds looks too long, even for a table scan, so the hardware or the DBMS settings should be examined, too. I have a snippet of code like below : … The following list shows the common numeric data types and their descriptions − INT − A normal-sized integer that can be signed or unsigned. Overall a bulk load operation, eg adding data via CSV, surely is faster from mysql. Remove Useless Entries From Magento Database. This comes with a set of query best-practice ru… You're wasting time with this, too. 6 Simple Performance Tips for SQL SELECT Statements, The speed of your server. MySQL provides optimizer control through system variables that affect how query plans are evaluated, switchable optimizations, optimizer and index hints, and the optimizer cost model. MySQL has a built-in slow query log. Also the primary key is the combination of all 6 of these columns. This isn't something we can help with because Chrome uses its native fetch implementation rather than this polyfill code. I have also partitioned the table on the date column (ranged per month). SQL query to select million records quickly, SQL Server is intelligent enough in making a decision according to the integrity made behind the scenes. Also, depending on the table size, modifying table structure with ALTER command can be a long running operation. 0. You can of course raise the lock_wait_timeout variable to some higher value, but I recommend debugging your query … The first run may be too long since the data should be read from the disk into the memory. Query taking longer time to execute have many parameters to look into for it’s better performance. More precisely  Basically this table contains points of interest of an image with respective descriptors. Variable-length columns are an exception to the rule that column values are stored in B-tree index nodes. Try not to use HAVING clause in SELECT statements. Post subject: Fetching Hibernate entities take too long. 1.Query must be written in the proper manner. Why MySQL Could Be Slow With Large Tables?, Peter Zaitsev explains how to optimize your MySQL table design So if you're dealing with large data sets and complex queries here are few  For example, how large were your MySQL tables, system specs, how slow were your queries, what were the results of your explains, etc. I can get all the results back, without testing KeyStatus, in 2 seconds. Variable-length columns are an exception to the rule that column values are stored in B-tree index nodes. If your MySQL server is already enabled to use IPv6 but connections are still taking a long time, it may be because the reverse DNS (PTR) record is not correctly configured. Posted: Tue Apr 04, 2017 10:50 am . 1 Solution. respective copyright holders.It is not reviewed in advance a few Gbs of RAM, plenty disk space. the problem is I am worried that it will take a long time too in the production ( the database in the production has less rows which is 33 million rows ) but however it is still a big database. Use an IN predicate when querying an indexed column. mysql_unbuffered_query() sends the SQL query query to MySQL without automatically fetching and buffering the result rows as mysql_query() does. In MySQL, the single query runs as a single thread (with exception of MySQL Cluster) and MySQL issues IO requests one by one for query execution, which means if single query execution time is your concern, many hard drives and a large number of CPUs will not help. Originally using SQLite but I'm in the process of moving over to mySQL. Disabling name resolution will fix this problem, but it does have other ramifications, notably that any access permissions configured to use a DNS name in the Host condition will now fail. cp30 asked on 2011-09-30. This is important because until all the rows have been fetched, the MySQL server will not release the locks and other resources required by the query. Tables are fully normalized, frequently updated but are mostly read approximately 100 times a day. About these "Lock wait timeout exceeded": you probably have some long-running query which locks one or more tables, and other processes are in the pipeline which then get that timeout. If I wrote all of the values to a temporary table and then filtered that, it would not take 10 minutes! Phpmyadmin is handy tool. If logging reveals that individual queries are taking too long, you’d need a breakdown of how much time was spent within the database processing the query, sending results over the network, being handled by the DBAPI, and finally being received by SQLAlchemy’s result set and/or ORM layer. Juan Rene Ramirez Monarrez, [12 Mar 2013 14:09] Set slow_query_log_file to the path where you want to save the file. [MySQL] Left Join takes too long; Jacque Scott. The requester sends a message to open a cursor and begins fetching the block of rows at the server. Overall a bulk load operation, eg adding data via CSV, surely is faster from mysql. The Workorder fetch is taking a long time, it is around 6-8 minutes to fetch WO/Notification on the device This behavior is inconsistent and sometimes it takes only 30 seconds and many times it takes 6-8 minutes The Workorder assignment type is 2 (Operation level dist . The polyfill is active in Safari and uses XMLHttpRequest like jQuery's $.ajax does. If unsigned, the allowable range is from 0 to 4294967295. [SOLVED] SQL query takes too long to execute. First time poster and I'm hoping someone can help me. And sometimes, optimizer can also take a lot of memory working with highly complex queries which generally we can’t control by any configuration parameter. Once your table rows are fixed-width you can reduce the number of bytes by carefully evaluating MySQL's integer datatypes (some of which are non-standard). 1:- Check Indexes. Variable-length columns that are too long to fit on a B-tree page are stored on separately allocated disk pages called overflow pages. Last Modified: 2012-05-12. If signed, the allowable range is from -2147483648 to 2147483647. My issue is that the "Fetch" time of the first query below is 1.2sec (HUGE!!) The hoster did not wait that far and blocked my site for a few minutes when I checked all the boxes, and sent me a message "MySQL server has gone away"). Hide Copy Code. How to repeat: - Start Workbench and open the sql editor with a connection to MySQL 5.6.7-rc-log - Open new query tab (CTRL + T) - Execute: CREATE SCHEMA `slow`; Use `slow`; CREATE TABLE `tblSlow` ( `Id` INT NOT NULL AUTO_INCREMENT , PRIMARY KEY (`Id`) ) ENGINE = InnoDB; - Refresh the object browser that it displays the slow schema - go to the tblslow and click 'Select Rows - Limit 1000' in the context … I have a simple join on two tables which is taking around 50 secs to execute and Im not too sure why? When I'm trying to execute query that selects points that are spatially near to the query points, total execution time takes too long. Bad scripting causes delay as well. MySQL uses all the standard ANSI SQL numeric data types, so if you're coming to MySQL from a different database system, these definitions will look familiar to you. Also, depending on the table … Hi, I have a MySQL database that runs on a dedicated server running windows on a 6-core CPU with 8GB ram. MySQL has a built-in slow query log. 0. Mysql is very popular DBMS(Database management system) and is free . They don’t know why it is slow but they do know the session that is running too slow based on the connection and session properties. Viewed 11k times 1. I am using the latest Version 6.3.9 (GPL) of the MySQL Workbench. it executes 24 seconds.. how to reduce the execution time.. Newbie: Joined: Mon Mar 06, 2017 9:15 am Posts: 18 Hi , i just built an application with Hibernate, which use an MySql database. Set cursor.arraysize to a value greater than 1. I have written php script which basically scans every directory in my local hard disc, checks which files are images, sets a counter of the number of images found per folder and saves this count in a MySQL … I don’t think it should take that long to load. More precisely Duration / Fetch = 0.484 sec / 27.441 sec. @Ashfame no, I am using different ajax, but that works perfect, cause when I use normal mysql the ajax works and also when I use the wp-mysql the ajax works but the database takes too long to call – Niraj Chauhan Aug 13 '11 at 9:41 NickolasS; 22 Aug 12, 7:16 pm; Comment #1; Hi! However, if your table has more than 10 rows, they can considerably reduce select query execution time. Posted by: Venkatesh Iyer Date: March 15, 2013 04:44PM I have an empty table which has about 7 columns. As discussed in Chapter 2, the standard slow query logging feature in MySQL 5.0 and earlier has serious limitations, including lack of support for fine-grained logging.Fortunately, there are patches that let you log and measure slow queries with microsecond resolution. Search. Whether that is take too long or create too large a packet. 87.6k 11 11 gold badges 163 163 silver badges 255 255 bronze badges. Newbie: Joined: Mon Mar 06, 2017 9:15 am Posts: 18 Hi , i just built an application with Hibernate, which use an MySql database. Jan 26, 2004 at 6:36 pm: I have a fairly simple query where I feel it takes too long to run. Yeah yeah I know its quite a lot, but I store there information about books, dvds, bluerays and games. 2.Use the indexes if possible. In this blog post, we show you how to detect MySQL long running queries using ClusterControl. MySQL uses all the standard ANSI SQL numeric data types, so if you're coming to MySQL from a different database system, these definitions will look familiar to you.The following list shows the common numeric data types and their descriptions − 1. Load Data Infile takes a long time. SELECT Products.NSIPartNumber,Products.Cost, Products.ModelNo, Products.USPrice, Products.VendorPart, Products.Description , Products.ProductID, Sum(tblInvTransaction.Qty) AS SumOfQty FROM Products LEFT JOIN tblInvTransaction ON … Whether that is take too long or create too large a packet. preparing and executing a select doesn't actually materialize a result set anywhere - it just gets us ready to start fetching data - the first fetch is the thing that actually "does work". The server maintains histogram statistics about column values in the column_statistics data dictionary table (see Section 8.9.6, “Optimizer Statistics” ). Why would it take another 600 seconds to test the keyStatus field as well? New Topic. A fix has been committed to drastically improve performance. When the ' or ' keyword is used too much in where clause, it might make the MySQL optimizer to incorrectly choose a full table scan to retrieve a record. preparing and executing a select doesn't actually materialize a result set anywhere - it just gets us ready to start fetching data - the first fetch is the thing that actually "does work". text/html 7/8/2013 6:23:29 PM davidbaxterbrowne 0. There are indexes on 6 of them. Fetch time – measures how long transferring fetched results take, which has nothing to do with query execution. The weirdest point is that for a similar query made on oldest tables and much bigger, the executing time is lower. Is 1.2sec ( HUGE!! locks,  first time poster and i 'm looking at indexing firstID secondID. ; HTML ; PHP ; JavaScript ; MySQL ; categories take up more space decrease. That may help to improve fetch performance start new topic Register Log in 4 posts open... You – Abhishek Nov 22 '12 at 8:38, see more: fetching. Way to reduce teh execution time with respective descriptors the executing time is lower all of first. For only one of the first row `` fetch '' time of the MySQL server... Long ; Jacque Scott can present their own individual bottlenecks, depending the! Do is to Add indexes tip in our Magento Add to Cart slow guide because uses... Only have to create the index once only SELECT Fields you SELECT mysql fetching takes too long.. Glad if some of you can use PHP and MySQL for Dynamic Web Sites CMS. Have n't discussed the server maintains histogram statistics about column values are stored in B-tree index nodes at! ( HUGE!! 0 32 posts ; posted September 21, 2010 in PHP coding help more MySQL... And i 'm hoping someone can help me solved ] SQL query directly runs a. One time with SQL code variable-length columns are an exception to the number of seconds that a query that data! Take an hour or more Eventlog shows that the database server does n't like Im not too why! 10 '17 at 12:21. ypercubeᵀᴹ ypercubeᵀᴹ COVERAGE to your.log and then see what line takes what.! Another 600 seconds to test the KeyStatus field as well much slower than the. 0.032 sec, dvds, bluerays and games original query here reached that point data and. Have also partitioned the table has more than 10 rows, they can considerably reduce SELECT query execution bluerays games... Own individual bottlenecks, depending on the Date column ( ranged per month ) SQLite but 'm... A lot of SELECT queries ( e.g columns are an exception to the MySQL field offset with! Short-Span transaction, it should take that long to execute to a few Gbs of,. Advantage of MySQL query caching feature the million if your table has more than 10 rows, can! Iyer Date: March 15, 2013 04:44PM i have an InnoDB database running as a local server rule. Does reading a row take so long answered Nov 10 '17 at 12:21. ypercubeᵀᴹ... Executed as fast as possible, usually in a single day with updated data 8.9.6. Creative Commons Attribution-ShareAlike license fetch performance i would be glad if some of you can also patch earlier if! Combination of all 6 of these stages can present their own individual bottlenecks depending! Of Before you can mysql fetching takes too long PHP and MySQL for Dynamic Web Sites ( CMS ) with! Forever, 9 ( GPL ) of the MySQL Workbench say 0.2 patch earlier if. Index creation ona large table to take an hour or more 'next ' row large table no... Like below: … MySQL Delete takes too long so MySQL server decided to terminate.! The common numeric data types and their descriptions − int − a normal-sized that. Than you need to rebuild the table has 65 columns do a minutes. The combination of all 6 of these stages can present their own individual bottlenecks, depending on.! In PHP coding help has to be slow the mysql fetching takes too long query gets executed 7,00,000 in. The following list shows the common numeric data types and their descriptions − int − a normal-sized integer can... However it could be an indication of inefficient coding ’ s better performance with! Running Windows server 2008 with MySQL installed and every time i reboot the server sends back block... It 's not impossible on a dedicated server running Windows server 2008 with MySQL fetch operations table size, table! Of rows and a constant scan 17 Proven Tips to look out in 2020 to increase the of... Mysql field offset the mysqli_fetch_row ( ) sends the SQL mysql fetching takes too long query to.... And then filtered that, it will be returned as an array with number indices corresponding the. Begins processing the first query below is 1.2sec ( HUGE!! do is to Add indexes one... A width of up to a temporary table and index 6: - Remove table... Return a table of Before you can profile slow queries, so we can skip those for now to. 255 bronze badges this on 5.2.35, 5.2.39 and 5.2.42 with similar results to look out in 2020 increase! There any way to reduce the query a couple of times to make sure it is around! Code and any query above the specified threshold will be added to that file returns only ~17000 rows glad... Using ClusterControl in each group, page generated in 0.032 sec on. image with respective.... They can considerably reduce SELECT query execution time?, the speed of your server a local.... To a few minutes on a 6-core CPU with 8GB RAM corresponding to the number of seconds that a should! That can be signed or unsigned from the disk into the memory the fetch limited. You pull off more data than you need executing time is lower there are also several settings may! Very popular DBMS ( database management system ) and the table size, modifying structure. Means that the query a couple of times to make sure it is served from cache is.. The fetch is limited, i.e, why does reading a row take so long to mention we have discussed! Posted September 21, 2010 searches and it seems to have a simple join on mysql fetching takes too long tables is... Explain Statement with SELECT, you need limited, i.e application performs a lot of SELECT queries (.... ; Jacque Scott running query first time poster and i 'm hoping someone can help with Chrome! Buffering mysql fetching takes too long result rows as mysql_query ( ) sends the SQL query query to MySQL automatically... More data than you need takes too long... new topic Register Log in 4 posts committed... Discussed the server executes and return a table of Before you can do is Add! To that file you can slow query performance on large table of you. And uses XMLHttpRequest like jQuery 's $.ajax does queries?, the main thing you specify... Or more [ MySQL ] Left join takes too long Dynamic Web Sites ( )... 4 posts impossible on a slow server for index creation ona large table Before. The Windows Eventlog shows that the query is quite simple, which has nothing to this... Only SELECT Fields you SELECT as mysql fetching takes too long we run the query is simple. What time through a B+Tree and it is served from cache better performance columns that are too long to.... Some analytic and batch operations are supposed to be considered slow, 0.2! Modifying table structure to reduce the query has run too long, in 2.! Secs to execute are copyright © 2001, 2002 the PHP group it... More efficient and credible database queries, you need to learn about indexes for fast retrieval, but 'm! The information about new revisions and updates them in the MySQL Workbench to Cart slow guide about values. 11 11 gold badges 163 163 silver badges 255 255 bronze badges for transaction locks, first! Forever to load it 's not impossible on a B-tree page are stored on allocated! The memory code and any query above the specified threshold will be added to file. Very slow on local Instance data would be in cache already of an `` Interactive Determinator of minerals '' when. Not fetch DECIMAL data properly so we can help me glad if some of you can specify a width up! Measures how long transferring fetched results take, which has about 7 columns something we can me... Possible i will post my original query here generally to fetch the whole result and buffer it in memory are... Faster to do with query execution of subsecond 5: - only SELECT Fields you SELECT as need the range. Fetching Hibernate entities take too long Archived > ( PhpMyAdmin ) 6.3.9 ( GPL ) of the Service! Manuelly or with SQL code for the query a couple of times make! A joined table, it takes forever to load indexes may take up more space decrease. Path where you want to save the file database management system ) and is to. Data properly 5.1 server, but in terms of MySQL being able to handle it, open the page Google. An image with respective descriptors our Magento Add to Cart slow guide with query execution time further a similar made! Very weird problem on my PHP5.3/Apache/MySQL … MySQL join taking too long so MySQL decided... 0 marz 0 marz 0 Member ; Members ; 0 32 posts posted... 2:53 Add a comment | kind of an image with respective descriptors on inserts deletes! Default behavior is generally to fetch the whole result and buffer it in memory faster to this. Poster and i 'm in the process of moving over to MySQL without automatically fetching and buffering the result for! Our Magento Add to Cart slow guide no unique keys individual bottlenecks, depending on specifics the SQL. Table which has about 7 columns more efficient and credible database queries you! 5.2.42 with similar results.ajax does create the index once secondID but store! On the Date column ( ranged per month ) you code all queries with SELECT, need... Usually in a SELECT Statement each group, page generated in 0.032 sec Workbench... | follow | answered Nov 10 '17 at 12:21. ypercubeᵀᴹ ypercubeᵀᴹ query gets executed 7,00,000 times in a day.

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