mysql bulk insert performance
Learn more about how adding MySQL indexes might impact database performance. Scott Scott. where size is an integer that represents the number the maximum allowed packet size in bytes.. If I have 20 rows to insert, is it faster to call 20 times an insert stored procedure or call a batch insert of 20 SQL insert statements? Bench Results. The data I inserted had many lookups. In fact we used load data infile which is one of the ways to get a great performance (the competing way is to have prepared bulk insert statements). (Seems like I'm able to post detailed answer here today... let me know if this has helped you) Here is a test output for you... mysql> truncate table t1; Query OK, 0 rows affected (0.07 sec) mysql> insert into t1 select * from t; Query OK, 3842688 rows affected (36.19 sec) Records: 3842688 Duplicates: 0 Warnings: 0 mysql> mysql> \! 169 1 1 silver badge 7 7 bronze badges. But when your queries are wrapped inside a Transaction, the table does not get re-indexed until after this entire bulk is processed. Case 2: Failed INSERT Statement. share | improve this question | follow | asked Jan 14 '15 at 13:06. Saving a lot of work. In the first case, it can help you answer a question: “how fast can I insert … Using application-level cache. Session 1 Before I push my test plan further, I'd like to get expert's opinion about the performance of the insert stored procedure versus a bulk insert. To test this case, I have created two MySQL client sessions (session 1 and session 2). Multiple rows insert was faster than the single row insert and faster than TVP in two of the four cases. mysql performance innodb insert bulk-insert. The MySQL bulk data insert performance is incredibly fast vs other insert methods, but it can’t be used in case the data needs to be processed before inserting into the SQL server database. Conclusion 2. When you run queries with autocommit=1 (default to MySQL), every insert/update query begins new transaction, which do some overhead. Bulk processing will be the key to performance gain. If it is possible, better to disable autocommit (in python MySQL driver autocommit is disabled by default) and manually execute commit after all modifications are done. This test can be used to benchmark the ability of MySQL to perform multi-row inserts. First, bulk_insert.lua. So far the theory. Let’s take an example of using the INSERT multiple rows statement. Importing a file using the LOAD DATA INFILE statement is the preferred solution when looking for raw performance over a single connection. That's some heavy lifting for you database. sponsored by Toggle navigation. In session 1, I am running the same INSERT statement within the transaction. Performance for the twenty-three column table was significantly longer. Bulk copy utility (bcp) was the fastest data load method and “Sub stringed multiple rows insert” was a close second. Re: Bulk INSERT performance question View as plain text At 06:46 PM 7/25/2008, you wrote: >List, > >I am bulk inserting a huge amount of data into a MyISAM table (a >wikipedia page dump). The INSERT INTO ..SELECT statement can insert as many rows as you want.. MySQL INSERT multiple rows example. But this time I have interrupted and killed the INSERT query at session 2. Note that the max_allowed_packet has no influence on the INSERT INTO ..SELECT statement. It does require you to prepare a properly formatted file, so if you have to dynamically generate this file first, be sure to take that into account when measuring INSERT … Normally your database table gets re-indexed after every insert. The inserts in this case of course are bulk inserts… using single value inserts you would get much lower numbers. This can be quite useful when checking, for example, performance of replication or Galera cluster. add a comment | 2 Answers Active Oldest Votes.