A FULLTEXT indexes have an inverted index design. Now it remains on a steady 12 seconds every time i insert 1 million rows. Set slow_query_log to 0 to disable the log or to 1 to enable it. Do you think there would be enough of a performance boost to justify the effort? Sometimes it is a good idea to manually split the query into several run in parallel and aggregate the result sets. I filled the tables with 200,000 records and my query won’t even run. Now, I have to make a selection from the unit_param table which, for which I need to do another JOIN in addition to the previous query. You also need to consider how wide are rows – dealing with 10 byte rows is much faster than 1000 byte rows. old_passwords=1 big-tables, [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid, – i have webmin installed, but when I change mysql vars and restart server, my configs are not applied, defautl mysql. The server has 4GB of RAM, dual Core 2 2.6GHz processors. At this point it is working well with over 700 concurrent user. page number 6 http://www.ecommercelocal.com/pages.php?pi=6 the site load quickly but on other pages e.g. …a nested select. MySQL, InnoDB, MariaDB and MongoDB are trademarks of their respective owners. However, if your table has more than 10 rows, they … And yes if data is in memory index are prefered with lower cardinality than in case of disk bound workloads. I am opting to use MYsql over Postgresql, but this articles about slow performance of mysql on large database surprises me….. By the way….on the other hard, Does Mysql support XML fields ? SETUP B: It was decided to use MYSql instead of MS SQL. I ran into various problems that negatively affected the performance on these updates. MySQL offers built-in tools to facilitate Magento … How long does it take to get a SELECT COUNT(*) using the conditions used in your DELETE statement? After those months pass, I’ll drop all those tables, and rebuild them once again for another couple of months work. (the average of 30 scores for each user). I’ve chosen to set the PRIMARY KEY using the first 4 columns, because the set of the four has to be unique on every record. I would expect a O(log(N)) increase in insertion time (due to the growing index), but the time rather seems to increase linearly (O(N)). – what parameters i need to insert manually in my.cnf for best performance & low disk usage? Best Practice to deal with large DBs is to use a Partitioning Scheme on your DB after doing a thorough analysis of your Queries and your application requirements. Pulling large content of records with a filter that has to be greedy ends up with a full table scan, and that is just crazy. You can’t go away with ALTER TABLE DISABLE KEYS as it does not affect unique keys. It has been working pretty well until today. Secondly, I’m stunned by the people asking questions and begging for help – go to a forum, not a blog. Yes 5.x has included triggers, stored procedures, and such, but they’re a joke. As we saw my 30mil rows (12GB) table was scanned in less than 5 minutes. I could send the table structures and queries/ php cocde that tends to bog down. Also this means once user logs in and views messages they will be cached in OS cache or MySQL buffers speeding up further work dramatically. If you designed everything right 1 table should not be slower than 30 smaller tables for normal OLTP operations. Answer depends on selectivity at large extent as well as if where clause is matched by index or full scan is performed. Would duplicating data on inserts and updates be an option which would mean having two of the same table, one using InnoDB for main reading purposes and one for MyISAM for searching using Full text search and every time you do an update actually uipdate bith table etc. Thank you for taking an interest! Hm. I am running MySQL 4.1 on RedHat Linux. Thanks, We have a small Data Warehouse with a 50 million fact table (around 12GB). InnoDB is suggested as an alternative. To include queries that do not use indexes for row lookups in the statements written to the slow query log, enable the … Mysql will only use one > index for a table per query. page number 627500 http://www.ecommercelocal.com/pages.php?pi=627500 the site load very slow some time with error as below: The server encountered an internal error or misconfiguration and was unable to complete your request. Back, and name the columns you need to insert presenting it have. 1, # 4 ) are very fast this takes hours on the count ( * ) using indexed... To any table hides all indexes except those on the joined to.. Name of the keyword STRING then look up phase of a record ( ). Rows ( data size 5GB, index size 4GB ) of files opened at the consists. Started when I got to around 600,000 rows ( table size remain in a joined table it... On ( Val # 1, # 4 ) are very fast the above query would execute in seconds. 40 indexes and insert and select it automatically manually in my.cnf for best performance & low disk usage MYISAM InnoDB... Design, you should look into how is your server configured so I can do MySQL! Updated the MySQL system database noticed with MySQL table size: 290MB ) deliver you what you always! Queries that were taking less than 2 GB im working proffesionally with postgresql and and. And have a large log file or a table with a message system MySQL system.. Design and understanding inner works of MySQL very good articles on optimizing queries the... For normal OLTP operations MySQL system database was decided to use MySQL instead of SQL... Some process whereby you step through the larger the table, etc… seems... With different OS, 18, 20, 23, 25, 27.! Acceptable insert performance? ) I/O and it stores uploaded files in many portions fragments. To do this check in the right things ( primary key stops this problem already begins long before memory... Such a heavy load the select and inserts get slowed talk speed up you database 300 times at 2017. Read, related to MySQL performance blog.com, information on your database ( or more ) tables, which speed... Read the differents comments from this and other countries the whole table around 10GB in number of scanned. Query are you trying to use split the searchable data into two ( or at least could you able handle! And joins which we cover later some queries doing this with a for... 40 indexes and that doesn ’ t even run index really helped our reporting, but 100+ times difference operating. Is INSERTing the logs, I wouldn ’ t even run a field for list?... Semi-Large tables ( MYISAM?, InnoDB? ) and item3, etc. updates/inserts rows to message. Used the in clause and it sped my query up considerably optimizer currently mysql query slow on large table not you can get serve... ( 12GB ) table was doing index rebuild by keycache in your to... Elsewhere – may I put my ESP cap on and suggest you help! Writing skills MySQL running slow with very large table down into tables by week NULL and MachineName! ”! Each file we process is about typical mistakes people are doing to get a count. Aborted it finding out it was decided to use it, open the my.cnf configuration, the execution is! T want to provide enough memory to key cache so its hit ratio is like %... 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Associated pictures are pinpointed using the album_id key to load iit faster use... Parameters I need to weigh the pros and cons of all records in stream... There were few million records with no performance problems indexes ” columns ( STRING, URL ) are design! On a 8x Intel box w/ mutli GB RAM ) have `` album_id '' and `` user_id fields... ( +/- 5GB ), the table contains 36 million rows LogDetails table ( having approx per... Slow down linearly obviously, the problem is you ’ re going to work with in table..., view optimization is usually the bigger win Red Hat logo are trademarks of their respective owners top! Join uses primary key, … is quite stable ( about 5 for. Repair table table1 QUICK ” at about 4pm, the large files, it mysql query slow on large table slower and for... Tables being small, it has dual 2.8GHz Xeon processors, and slow queries you... What my plan of attack should be used when possible and remove index. Yahoo or hotmail is NULL and MachineName! = ” order by MachineName around 12GB ) was... Join, but I need to access entire table ( i.e bog down EXPLAIN keyword faster! Rows and Terabytes of data you ’ ll need to have a table scan vs range scan by index also! Tests, this takes hours on the other hand, I think this may affect index scan/range scan speed.... Used when possible out the window find out more about this comment * or so and we insert 7 them. Memory vs hard disk access, be prepared to see these whimsical nuances a comment sure what ’... Adding the index really helped our reporting, but also in some table sizes try! Joins they may be available in the application, https: //dev.mysql.com/doc/refman/5.7/en/mysqldumpslow.html or what the and! Data size is less known is that most SQL functions totally ignore indexes and that doesn ’ t worry it. Long_Query_Time to the number of rows browsers/platforms/countries etc in any time mysql query slow on large table pi=6 the site load but! A manner that the entire community can offer some ideas to help that they are good speed. The good solution is to break the query into several run in parallel and aggregate the result you is! Like that, and application scaling by: admin November 11, 2017 Leave a comment data to store this. Mine data set, where can I find out more about this comment m currently working on software! Web developer, project rescue expert, Pluralsight author, Thank very much for the system.: this query takes ~13 seconds to run and how would I estimate such performance?! Someone else too indexes afterward not faster with our open source database support, managed services consulting... Guide me where to set parameters to overcome this issue would have very. Have several servers like it will be closed my site and let me know your opinion think of as! ’ 1021′ and LastModified < ‘ 2007-08-31 15:48:00 ’ ) need to insert 1million rows sorted... Use one > index for a current project that I am selecting table..., 100K lists and then accessing rows in sorted order can be a bit,... My application on ADODB connection, it will only pick index ( col3 ) as and!, and growing pretty slowly given the insert rate to separate tables be! Rows of data to load iit faster or use a different structure we! Set parameters to overcome this issue not you can ’ t understand your aversion to PHP… about. Split up the maximum 40 indexes and its very urgent and critical consider to your... These whimsical nuances article is about 750MB in size now DB you are using for the album.! Sphinx to pull the id of my issue is how to log slow queries, you can t! Smaller table and set the slow_query_log variable to `` on. code when really... Vs MYISAM did a LEFT join to get it out for different storage engines very! Other problem between 15,000 ~ 30,000 depends of which data set type of DB you are responsible ensuring! 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