[Wiki] mysql performance tip

When we are doing an insert of huge no.of rows into an SQL table ,Normally we will try to write separate insert quries this may lead us to a long duration of execution time and we can increase the speed of executing SQL quries by adding all the rows into a single insert query.

NORMAL CASE:

eg:INSERT INTO tbl_name(field1,field2,…) values(value1,value2,..);
    INSERT INTO tbl_name(field1,field2,…) values(value1,value2,..);
    INSERT INTO tbl_name(field1,field2,…) values(value1,value2,..);

We can decrease the execution time by adding all these rows into a single INSERT query like below,

INSERT INTO tbl_name(field1,field2,…) values(value1,value2,..),values(value1,value2,..),values(value1,value2,..),….;

This is useful when we are trying to insert about 10k of rows into a table at a time. For me normally it takes 1min 15 sec to insert 10k of rows but by using this tip it takes only 10 sec to insert 10k of rows.

i have tried this when i did excel and csv import feature. For excel it took around 20 sec and for csv it took 10 sec of execution time for inseting 10k of rows.

Reagards,

sirin k