Hello my fellow postgreSQL gurus. I�m a user of�� postgresSQL of quite some time now, but most of my experience is consuming database, and for the current project we are without a proper DBA and they have to bear with me and so I must seek advice.
I have a list of building and a queue and the user can start the construction of one or more building that will take some time to build. The problems lies with the fact this is a web browser game and the user can log in, star the construction and log off, to further aggravate the problem another user may take a look at the buildings, to add a little bit more, when a building is done it may have effect on the user population, gold and whatever the �imagination team� can come up with.
Bottom line is: the construction has to be �concluded� with second�s precision.
Lets say for a 20 thousand users server, it may have at most 20 thousand constructions started at the same time.
To accomplish such behavior so far I could come up with two options:
1.������ Make a never ending function that will look at the ��BuildingQueue table every second and finish the construction.
2.������ Every time the user start a construction add a cron job for that construction to run 1 seconds after the construction is finished and call a function the will finish.
�
For some reason I can not believe that a never ending function is a good idea and I don�t think cron jobs are meant to have 20 thousand jobs.
Anyone care to share?
Tables:
Create table "Building"
(
��������������� "idBuilding" Serial NOT NULL,
��������������� "description" Varchar(200),
��������������� "time" Integer,
�primary key ("idBuilding")
) Without Oids;
Create table "BuildingQueue"
(
��������������� "idBuilding" Integer NOT NULL,
��������������� "start" Timestamp,
��������������� "end" Timestamp,
�primary key ("idBuilding")
) Without Oids;
�
Alter table "BuildingQueue" add� foreign key ("idBuilding") references "Building" ("idBuilding") on update restrict on delete restrict;
