You are probably OK with one instance with that load. Multiple instances spread out the impact from slow operations and allow you to start a new instance of a new version without interrupting current user sessions.
Chuck On Sep 20, 2010, at 3:42 AM, Theodore Petrosky wrote: > Currently, I am only running one instance. But of course this brings in the > question of instances. > > From what I am reading, I see that the connection to the database is single > threaded. So only one reader/writer at a time. I have very few users > currently. I think the max number of users will be in the 40-50 range. > > I am running the database (postgresql) and the webserver on a MacMini (new). > What are the limits before I need to add another instance. I would love to > hold this to the one instance, but recognize that I will have to learn the > techniques for handling multiple instances. > > > Ted > > --- On Sun, 9/19/10, Chuck Hill <ch...@global-village.net> wrote: > >> From: Chuck Hill <ch...@global-village.net> >> Subject: Re: EOEditingContext help >> To: "Theodore Petrosky" <tedp...@yahoo.com> >> Cc: "David Avendasora" <webobje...@avendasora.com>, >> webobjects-dev@lists.apple.com >> Date: Sunday, September 19, 2010, 11:08 PM >> >> On Sep 19, 2010, at 5:20 AM, Theodore Petrosky wrote: >> >>> Users are adding time/work objects. (I worked on job >> number 10 for .25 hour and here is what I did.) >>> >>> the finance department runs a report that gets all >> these work objects and when they are happy they mark them as >> 'Accepted'. This is what I am capturing. >>> >>> I need to mark 1000 objects as accepted. I could get >> an array of all the objects, mark them as accepted and save >> the EC. >>> >>> or just tell the database update all time/work record >> of job number 10 to accepted. But of course this is behind >> the back of my App. >>> >>> I don't think there will be more than 1 to 2 thousand >> objects (50 users with 20 hits = 1000 objects). >> >> I would not worry until I got to 100,000. If you see >> issues in performance testing (or actual usage), THEN >> worry. >> >> >>> At issue is, once the object is marked as accepted, >> the users can not edit the object. So if a user selects an >> object to edit, the save junction is disabled if the time >> object is marked as accepted. >>> >>> I think I will try what you recommended and see if >> there is a reason to care about the procedure. >> >> If you will be running multiple instances, then you need to >> do something to handle data freshness issues. >> >> Chuck >> >> >>> --- On Sun, 9/19/10, David Avendasora <webobje...@avendasora.com> >> wrote: >>> >>>> From: David Avendasora <webobje...@avendasora.com> >>>> Subject: Re: EOEditingContext help >>>> To: "Theodore Petrosky" <tedp...@yahoo.com> >>>> Cc: webobjects-dev@lists.apple.com >>>> Date: Sunday, September 19, 2010, 7:01 AM >>>> Hi Ted, >>>> >>>> Can you define "whole bunch" are we talking >> thousands, >>>> millions? I follow the mantra of "First make it >> work, then >>>> worry about optimizing it if it is to slow." >>>> >>>> If you are updating the same attribute on all the >> objects, >>>> you can simply use key-value coding. >>>> >>>> myArray.takeValueForKey(newValue, >> Entity.ATTRIBUTE_KEY); >>>> >>>> Also, how are you saving? Are you saving each >> object, or >>>> saving the EditingContext? >>>> >>>> Dave >>>> >>>> >>>> On Sep 18, 2010, at 11:38 PM, Theodore Petrosky >> wrote: >>>> >>>>> I have to update a whole bunch of objects. >> Method 1 >>>> says make a list of the objects, make the changes >> and >>>> saveChanges(). Seems really inefficient. If there >> were only >>>> 50 objects I would probably do that. So I created >> a >>>> procedure on backend. Basically, an update of all >> records >>>> that match a job number. >>>>> >>>>> Of course this is making a change behind the >> back of >>>> my WO App. and someone may be looking at this >> data. >>>>> >>>>> So what are my choices? go back to method 1. >> Looping >>>> through 500 records, then saving changes? Or is >> there a way >>>> to selectively invalidate these objects to force >> any other >>>> users to get fresh data? >>>>> >>>>> Ted >>>>> >>>>> >>>>> >>>>> >> _______________________________________________ >>>>> Do not post admin requests to the list. They >> will be >>>> ignored. >>>>> Webobjects-dev mailing list >> (Webobjects-dev@lists.apple.com) >>>>> Help/Unsubscribe/Update your Subscription: >>>>> http://lists.apple.com/mailman/options/webobjects-dev/webobjects%40avendasora.com >>>>> >>>>> This email sent to webobje...@avendasora.com >>>>> >>>>> >>>> >>>> >>> >>> >>> >>> _______________________________________________ >>> Do not post admin requests to the list. They will be >> ignored. >>> Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) >>> Help/Unsubscribe/Update your Subscription: >>> http://lists.apple.com/mailman/options/webobjects-dev/chill%40global-village.net >>> >>> This email sent to ch...@global-village.net >> >> -- >> Chuck Hill >> Senior Consultant / VP Development >> >> Practical WebObjects - for developers who want to increase >> their overall knowledge of WebObjects or who are trying to >> solve specific problems. >> http://www.global-village.net/products/practical_webobjects >> >> >> >> >> >> >> >> > > > -- Chuck Hill Senior Consultant / VP Development Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems. http://www.global-village.net/products/practical_webobjects
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