optimization - MySQL - INSERT queries taking long time -


i have table 10.000 rows. structure of table is:

create table if not exists `demands` (   `cycle_id` int(11) not null,   `subject_id` varchar(45) collate utf8_unicode_ci not null,   `market_id` int(11) not null,   `price` int(11) not null,   `currency_id` varchar(45) collate utf8_unicode_ci default null,   `amount` bigint(20) default null ) engine=innodb default charset=utf8 collate=utf8_unicode_ci;

keys:

  • primary (cycle_id, subject_id, market_id, price)
  • fk1 (market_id)
  • fk2 (subject_id)
  • fk3 (currency_id)

query offen takes long time (about 1s):

insert poptavky values    (4, 'user', 17, 110, 'pound', 110) ,   (4, 'user', 17, 90, 'pound', 120) ,    (4, 'user', 17, 70, 'pound', 130) ;

where problem? thanks

it sounds not on high end server , problems compounded having far many indexes.

this index on it's own rather massive one:

primary (cycle_id, subject_id, market_id, price)

it spans 4 columns , 2 of them varchar columns. in not problem. have 3 more:

fk1 (market_id) fk2 (subject_id) fk3 (currency_id)

after each insert database has recalculate indexes , takes lot of time when number of indexes and/or index length high. particularly when lots of data inserted @ once.


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