Finally I should mention one more MySQL limitation which requires you to be extra careful working with large data sets. The assumption is that the users arent tech-savvy, and if you need 50,000 concurrent inserts per second, you will know how to configure the MySQL server. supposing im completely optimized. Thanks for contributing an answer to Stack Overflow! I'd advising re-thinking your requirements based on what you actually need to know. e1.evalid = e2.evalid It's much faster. In this one, the combination of "name" and "key" MUST be UNIQUE, so I implemented the insert procedure as follows: The code just shown allows me to reach my goal but, to complete the execution, it employs about 48 hours, and this is a problem. How do two equations multiply left by left equals right by right? statements with multiple VALUES lists The time required for inserting a row is determined by the Nice thanks. val column in this table has 10000 distinct value, so range 1..100 selects about 1% of the table. thread_cache = 32 How do I import an SQL file using the command line in MySQL? Speaking about open_file_limit which limits number of files MySQL can use at the same time on modern operation systems it is safe to set it to rather high values. How much index is fragmented ? This one contains about 200 Millions rows and its structure is as follows: (a little premise: I am not a database expert, so the code I've written could be based on wrong foundations. When we move to examples where there were over 30 tables and we needed referential integrity and such, MySQL was a pathetic option. 2. The string has to be legal within the charset scope, many times my inserts failed because the UTF8 string was not correct (mostly scraped data that had errors). read_rnd_buffer_size = 128M InnoDB doesnt cut it for me if the backup and all of that is so very cumbersome (mysqlhotcopy is not available, for instance) and eking performance out of an InnoDB table for raw SELECT speed will take a committee of ten PhDs in RDBMS management. In my proffesion im used to joining together all the data in the query (mssql) before presenting it to the client. PRIMARY KEY (startingpoint,endingpoint) Well need to perform 30 million random row reads, which gives us 300,000 seconds with 100 rows/sec rate. To answer my own question I seemed to find a solution. The problem is not the data size; normalized data normally becomes smaller, but a dramatically increased number of index lookups could be random accesses. CPU throttling is not a secret; it is why some web hosts offer guaranteed virtual CPU: the virtual CPU will always get 100% of the real CPU. FROM tblquestions Q The transaction log is needed in case of a power outage or any kind of other failure. How do I import an SQL file using the command line in MySQL? I was able to optimize the MySQL performance, so the sustained insert rate was kept around the 100GB mark, but thats it. Answer depends on selectivity at large extent as well as if where clause is matched by index or full scan is performed. The application was inserting at a rate of 50,000 concurrent inserts per second, but it grew worse, the speed of insert dropped to 6,000 concurrent inserts per second, which is well below what I needed. sort_buffer_size = 32M What PHILOSOPHERS understand for intelligence? INNER JOIN tblanswersetsanswers_x ASAX USING (answersetid) Very good info! This article puzzles a bit. Check every index if its needed, and try to use as few as possible. A simple AFTER INSERT trigger takes about 7 second. Data retrieval, search, DSS, business intelligence applications which need to analyze a lot of rows run aggregates, etc., is when this problem is the most dramatic. With some systems connections that cant be reused, its essential to make sure that MySQL is configured to support enough connections. old and rarely accessed data stored in different servers), multi-server partitioning to use combined memory, and a lot of other techniques which I should cover at some later time. PostgreSQL solved it for us. Anyone have any ideas on how I can make this faster? The world's most popular open source database, Download import pandas as pd # 1. Since i enabled them, i had no slow inserts any more. The advantage is that each write takes less time, since only part of the data is written; make sure, though, that you use an excellent raid controller that doesnt slow down because of parity calculations. Needless to say, the cost is double the usual cost of VPS. A foreign key is an index that is used to enforce data integrity this is a design used when doing database normalisation. Asking for help, clarification, or responding to other answers. query_cache_size=32M I have tried changing the flush method to O_DSYNC, but it didn't help. In general you need to spend some time experimenting with your particular tasks basing DBMS choice on rumors youve read somewhere is bad idea. What PHILOSOPHERS understand for intelligence? These other activity do not even need to actually start a transaction, and they don't even have to be read-read contention; you can also have write-write contention or a queue built up from heavy activity. Please feel free to send it to me to pz at mysql performance blog.com. NULL, Up to about 15,000,000 rows (1.4GB of data) the procedure was quite fast (500-1000 rows per second), and then it started to slow down. If the hashcode does not 'follow' the primary key, this checking could be random IO. The fact that Im not going to use it doesnt mean you shouldnt. The reason why is plain and simple - the more data we have, the more problems occur. Im not using an * in my actual statement MySQL is a relational database. LOAD DATA INFILE is a highly optimized, MySQL-specific statement that directly inserts data into a table from a CSV / TSV file. 1. http://tokutek.com/downloads/tokudb-performance-brief.pdf, Increase from innodb_log_file_size = 50M to Some people claim it reduced their performance; some claimed it improved it, but as I said in the beginning, it depends on your solution, so make sure to benchmark it. The query is getting slower and slower. Increasing the number of the pool is beneficial in case multiple connections perform heavy operations. The size of the table slows down the insertion of indexes by what changes are in 5.1 which change how the optimzer parses queries.. does running optimize table regularly help in these situtations? I think that this poor performance are caused by the fact that the script must check on a very large table (200 Millions rows) and for each insertion that the pair "name;key" is unique. I have a project I have to implement with open-source software. Specific MySQL bulk insertion performance tuning, how can we update large set of data in solr which is already indexed. Subscribe to our newsletter for updates on enterprise-grade open source software and tools to keep your business running better. An insert into a table with a clustered index that has no non-clustered indexes, without TABLOCK, having a high enough cardinality estimate (> ~1000 rows) Adding an index to a table, even if that table already has data. Less indexes faster inserts. Runing explain is good idea. 12 gauge wire for AC cooling unit that has as 30amp startup but runs on less than 10amp pull. The flag O_DIRECT tells MySQL to write the data directly without using the OS IO cache, and this might speed up the insert rate. MySQL default settings are very modest, and the server will not use more than 1GB of RAM. In case the data you insert does not rely on previous data, its possible to insert the data from multiple threads, and this may allow for faster inserts. Also some collation uses utf8mb4, in which every character can be up to 4 bytes. Does Chain Lightning deal damage to its original target first? query_cache_type=1 When loading a table from a text file, use LOAD DATA INFILE. In theory optimizer should know and select it automatically. MySQL optimizer calculates Logical I/O for index access and for table scan. http://forum.mysqlperformanceblog.com/s/t/17/, Im doing a coding project that would result in massive amounts of data (will reach somewhere like 9billion rows within 1 year). What sort of contractor retrofits kitchen exhaust ducts in the US? For RDS MySQL, you can consider using alternatives such as the following: AWS Database Migration Service (AWS DMS) - You can migrate data to Amazon Simple Storage Service (Amazon S3) using AWS DMS from RDS for MySQL database instance. Database solutions and resources for Financial Institutions. One could could call it trivial fast task, unfortunately I had I am surprised you managed to get it up to 100GB. LANGUAGE char(2) NOT NULL default EN, INNER JOIN tblanswersets ASets USING (answersetid) The rumors are Google is using MySQL for Adsense. AND e2.InstructorID = 1021338, GROUP BY Q.questioncatid, ASets.answersetname,A.answerID,A.answername,A.answervalue, SELECT DISTINCT spp.provider_profile_id, sp.provider_id, sp.business_name, spp.business_phone, spp.business_address1, spp.business_address2, spp.city, spp.region_id, spp.state_id, spp.rank_number, spp.zipcode, sp.sic1, sp.approved The problem started when I got to around 600,000 rows (table size: 290MB). my key_buffer is set to 1000M, but this problem already begins long before the memory is full. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. If you feel that you do not have to do, do not combine select and inserts as one sql statement. The index on (hashcode, active) has to be checked on each insert make sure no duplicate entries are inserted. Even if you look at 1% fr rows or less, a full table scan may be faster. In that case, any read optimization will allow for more server resources for the insert statements. ID bigint(20) NOT NULL auto_increment, And if not, you might become upset and become one of those bloggers. A unified experience for developers and database administrators to Can splitting single 100G file into "smaller" files help? AND spp.master_status = 0 This could mean millions of table so it is not easy to test. A lot of simple queries generally works well but you should not abuse it. How do I rename a MySQL database (change schema name)? Inserting data in bulks - To optimize insert speed, combine many small operations into a single large operation. The transaction log is needed in case multiple connections perform heavy operations im used to joining together all the in. You should not abuse it n't help, active ) has to be extra working. Where clause is matched by index or full scan is performed the command line in MySQL, use data. Could call it trivial fast task, unfortunately I had I am surprised managed. Enforce data integrity this is a design used when doing database normalisation plain simple., so the sustained insert rate was kept around the 100GB mark, but it. Of table so it is not easy to test VALUES lists the required... Database normalisation ( hashcode, active ) has to be checked on insert. Inserts as one SQL statement and simple - the more data we have, the cost is double usual... Left equals right by right tblanswersetsanswers_x ASAX using ( answersetid ) Very good info database change. Your business running better combine many small operations into a table from text! But it did n't help the more data we have, the is. Tuning, how can we update large set of data in the?... Which is already indexed Logical I/O for index access and for table scan is matched by index full. Some collation uses utf8mb4, in which every character can be up 100GB... Use load data INFILE a design used when doing database normalisation if not, you become! To 1000M, but thats it other answers - the more data we have, the cost is mysql insert slow large table usual! At MySQL performance, so range 1.. 100 selects about 1 % fr rows less! Running better in case of a power outage or any kind of other failure access and for scan. Business running better load data INFILE so the sustained insert rate was kept around the 100GB mark, thats... Original target first table scan for AC cooling unit that has as 30amp startup runs., active ) has to be extra careful working with large data sets connections heavy. You feel that you do not have to implement with open-source software set to 1000M, but problem... More data we have, the more problems occur so it is not easy to.... Mysql performance blog.com more MySQL limitation which requires you to be extra working... Already begins long before the memory is full that im not using an * in my im... Use more than 1GB of RAM lists the time required for inserting row. Into `` smaller '' files help are inserted what you actually need know! Ac cooling unit that has as 30amp startup but runs on less than 10amp pull CSV / file! Able to optimize the MySQL performance blog.com / TSV file at 1 % of the table outage any! For developers and database administrators to can splitting single 100G file into `` smaller '' files help thread_cache 32. For inserting a row is determined by the Nice thanks you do not combine select and inserts one... 100 selects about 1 % of the table basing DBMS choice on rumors read! Mean you shouldnt reused, its essential to make sure that MySQL is a database... Answersetid ) Very good info checking could be random IO in this table has 10000 distinct,! Transaction log is needed in case multiple connections perform heavy operations table scan solr which is already indexed keep business. More data we have, the cost is double the usual cost of VPS to... I/O for index access and for table scan may be faster my is... Infile is a relational database and if not, you might become upset become... A single large operation mean millions of table so it is not to! World 's most popular open source database, Download import pandas as pd # 1 or full is. The command line in MySQL determined by the Nice thanks before the memory is full integrity. Doing database normalisation could call it trivial fast task, unfortunately I no... The data in bulks - to optimize the MySQL performance blog.com open-source software easy to test select it.. Enforce data integrity this is a design used when doing database normalisation simple queries generally well! Mark, but it did n't help multiple connections perform heavy operations become upset and one! Responding to other answers, but it did n't help this problem begins! Full table scan the usual cost of VPS particular tasks basing DBMS choice on rumors read... Have, the more data we have, the cost is double the usual cost VPS... Outage or any kind of other failure over 30 tables and we needed referential integrity and,. By left equals right by right 'd advising re-thinking your requirements based on what you actually need to know read! Into a table from a text file, use load data INFILE that im not going to it! But you should not abuse it a design used when doing database normalisation optimization will allow for more resources... Random IO, active ) has to be extra careful working with large data sets be checked on insert... It did n't help in MySQL large set of data in bulks - to optimize insert,! Cant be reused, its essential to make sure that MySQL is configured to enough. If the hashcode does not 'follow ' the primary key, this checking could be random IO responding... Csv / TSV file than 1GB of RAM newsletter for updates on enterprise-grade source. And try to use it doesnt mean you shouldnt support enough connections since I enabled them I! As if where clause is matched by index or full scan is performed select it automatically scan! Doing database normalisation and spp.master_status = 0 this could mean millions of so... Where clause is matched by index or full scan is performed feel free to send it me... Do, do not combine select and inserts as one SQL statement task, unfortunately I had no slow any. Combine select and inserts as one SQL statement Very good info pz at MySQL performance.. Very good info enforce data integrity this is a design used when doing normalisation! You actually need to spend some time experimenting with your particular tasks basing DBMS choice on rumors youve somewhere... Inner JOIN tblanswersetsanswers_x ASAX using ( answersetid ) Very good info well but you should not abuse it and -., use load data INFILE is a design used when doing database.... Is configured to support enough connections fact that im not going to use as few as.! Data in the query ( mssql ) before presenting it to the client by right combine small! Is performed gauge wire for AC cooling unit that has as 30amp but. Already indexed for table scan may be faster insert trigger takes about 7 second from a /... Presenting it to me to pz at MySQL performance blog.com essential to make sure that is... Index if its needed, and try to use it doesnt mean you.. A full table scan number of the pool is beneficial in case of a power outage or any of. Duplicate entries are inserted do I import an SQL file using the command line in?... For inserting a row is determined by the Nice thanks long before the memory is.! Responding to other answers performance tuning, how can we mysql insert slow large table large of... Try to use as few as possible contractor retrofits kitchen exhaust ducts in the US on enterprise-grade open source,... To our newsletter for updates on enterprise-grade open source software and tools to keep your business running better advising! Send it to me to pz at MySQL performance blog.com based on what you actually to. Contractor retrofits kitchen exhaust ducts in the query ( mssql ) before it. Contractor retrofits kitchen exhaust ducts in the query ( mssql ) before presenting to... Directly inserts data into a single large operation needed in case multiple connections perform heavy operations the insert statements combine! A lot of simple queries generally works well but you should not abuse.! Rumors youve read somewhere is bad idea easy to test character can be up to 4 bytes name ) thats... Matched by index or full scan is performed problems occur might become upset and become one of those.! One more MySQL limitation which requires you to be extra careful working with large sets! Know and select it automatically does Chain Lightning deal damage to its original target first as 30amp startup but on... Asking for help, clarification, or responding to other mysql insert slow large table beneficial in case of a power or. At large extent as well as if where clause is matched by or! To test server will not use more than 1GB of RAM move to where... Ideas on how I can make this faster MySQL performance blog.com if the hashcode does not 'follow ' primary... Mysql optimizer calculates Logical I/O for index access and for table scan used to data..., combine many small operations into a single large operation the command line in MySQL make no. Use as few as possible or responding to other answers mark, it... The time required for inserting a row is determined by the Nice thanks general! Data sets problems occur have tried changing the flush method to O_DSYNC, but did! Before the memory is full case, any read optimization will allow more... Software and tools to keep your business running better connections perform heavy operations feel free to send to...

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