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authorJose M. Guisado <jguisado@soleta.eu>2021-04-16 10:33:51 +0000
committerOpenGnSys Support Team <soporte-og@soleta.eu>2021-04-16 13:31:45 +0200
commit746166e4c23cb6bbb60d104b5c79df119f7e161b (patch)
treee932ffdd5693d39345208edfde36ae53b263336e /.gitignore
parent42c22539a3970395ebfd6c0f306ca18624089293 (diff)
#971 Remove sql bottleneck when removing software profiles
Several universities have reported that creating a software profile hangs the machine running the ogServer for a while, sometimes up to minutes. Legacy SQL code is producing said bottleneck, responsible for pruning a intermediate table between "perfilessoft" and "softwares". There is redundant code, "perfilssoft" should be pruned first, speeding up the later task of pruning the intermediate table "perfilessoft_softwares" There is no need to execute: DELETE FROM perfilessoft_softwares WHERE idperfilsoft IN ( SELECT idperfilsoft FROM perfilessoft WHERE idperfilsoft NOT IN ( SELECT DISTINCT idperfilsoft from ordenadores_particiones) AND idperfilsoft NOT IN ( SELECT DISTINCT idperfilsoft from imagenes)) When afterwards "perfilessoft" is going to be pruned and "perfilessoft_softwares" pruned again: DELETE FROM perfilessoft WHERE idperfilsoft NOT IN (SELECT DISTINCT idperfilsoft from ordenadores_particiones) AND idperfilsoft NOT IN (SELECT DISTINCT idperfilsoft from imagenes) DELETE FROM perfilessoft_softwares WHERE idperfilsoft NOT IN (SELECT idperfilsoft from perfilessoft) The two latter commands suffice. This should not happen when using a relational database supporting foreign keys and ON DELETE CASCADE, like innoDB, which will be adopted soon.
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