mysql - How to speed up SQL query -


i need advise if adjustment possible.

table:

create table util_day (   compid varchar(15) collate utf8_czech_ci not null,   testplanid int(10) unsigned not null default '0',   fromdate datetime not null default '0000-00-00 00:00:00',   todate datetime not null default '0000-00-00 00:00:00',   interval int(11) not null default '0',   variant varchar(25) collate utf8_czech_ci default null,   wo_id int(11) default null,   saptime int(5) default null,   usetime int(5) not null,   measurecount int(10) unsigned not null,   key compid (compid),   key testplanid (testplanid),   key wo_id (wo_id),   key fromdate (fromdate),   key variant (variant) ) engine=innodb default charset=utf8 collate=utf8_czech_ci;

the current query : 

update util_day uday set testplanid = (select testplanid                                         (select ud_u.variant,ud_u.wo_id,vs.testplanid                                               (select ud.variant,ud.wo_id                                                     util_day ud substr(compid,1,3) <> 'aoi'                                                     group ud.variant,ud.wo_id) ud_u                                               join variants v on ud_u.variant = v.variant                                               join variant_status vs on v.variantid = vs.variantid                                               join testplans_wo_id tw on ud_u.wo_id = tw.wo_id                                               vs.testplanid = tw.testplanid                                               group ud_u.variant,ud_u.wo_id ) tp                                         tp.variant = uday.variant , tp.wo_id = uday.wo_id)

and update temporary table: 

create temporary table util_day_temp ( variant varchar(25) collate 'utf8_czech_ci' not null, wo_id int unsigned not null, testplanid int unsigned not null, primary key variant_wo_id (variant, wo_id)) comment='' engine='innodb' collate 'utf8_czech_ci'; insert ignore util_day_tmp (select ud_u.variant,ud_u.wo_id,vs.testplanid                  (select ud.variant,ud.wo_id              util_day ud substr(compid,1,3) <> 'aoi'              group ud.variant,ud.wo_id) ud_u        join variants v on ud_u.variant = v.variant        join variant_status vs on v.variantid = vs.variantid        join testplans_wo_id tw on ud_u.wo_id = tw.wo_id        vs.testplanid = tw.testplanid        group ud_u.variant,ud_u.wo_id);  update util_day uday set testplanid = (select testplanid                                          util_day_temp tp                                           tp.variant = uday.variant , tp.wo_id = uday.wo_id);

this improvement accelerated query on 2milion rows 400%. improvement has same result? thank answers.

first, use

explain command mysql.

after that, figure out if indexes (warning: not create indexes out of control) also, check documentation composite indexes on mysql


Comments

Post a Comment

Popular posts from this blog

Why does Ruby on Rails generate add a blank line to the end of a file? -

running rails generate controller foo home results in: class foocontroller < application controller def home end end (there's nothing on line in actual file, blank line) is there purpose blank line? it's common use newline indicate end of line, last line. many editors (like vi, use) add in newline silently. consensus text files (especially in unix world) should end in newline, , there have been problems historically if wasn't present. why should text files end newline? the tool used count lines in file "wc" counts newlines in file, without trailing newline show 3 instead of 4. it improves readability of templates used in generator. consider: https://github.com/rails/rails/blob/master/railties/lib/rails/generators/rails/controller/templates/controller.rb to remove trailing newline, template have last line of: end<% end -%> instead of: end <% end -%> that seems less readable me. the discussion below refers
Read more

keyboard - Smiles and long press feature in Android -

i've created android keyboard. how add features inserting smilies, , using long keypresses display symbols? to create long-press behavior allows select several options pop-up menu, follow guide (specifically pop-up menu section): http://developer.android.com/guide/topics/ui/menus.html smileys (also known emoticons) combination of keys, understood programs , parsed same way. have do, when clicks smiley face on keyboard, simulate pressing of key combination matching emoticon. example, when clicks smiley, should simulate key presses ':' , ')' :). here's list of emoticons: http://en.wikipedia.org/wiki/list_of_emoticons
Read more

node.js - Bad Request - node js ajax post -

i'm using express 3.0 , node v0.11.0. have button submits form , i'm using ajax post data json object node server. client code is: $('#contact').submit(function(e) { console.log('submit called'); var formdata = json.stringify($('form').serializeobject()); console.log(formdata); $.ajax({ url: "http://localhost:3000/savedata/", type: "post", datatype: 'json', data: {objectdata: formdata}, contenttype: "application/json", complete: function() { console.log('process complete'); }, success: function(data) { console.log('process sucess'); }, error: function() { console.log('process error'); }, }); return false; }); then on server: var express = require('express'); var app = express(); app.set('views', __dirname + '/views'); app.set('view engine', 'jade'); app.use(express.bodyparser());
Read more