Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Ruby on Rails does not support two-phase commits out of the box, which maybe required if your database-backed application needs to guarantee immediate consistency AND you need to use two or more database schemas.</p> <p>For many web applications, I would venture that this is not a common use-case. One can perfectly well support eventual consistency with two or more databases. Or one could support immediate consistency with one database schema. The former case is a great problem to have if your app has to support a mondo amount of transactions (note the technical term :). The latter case is more typical, and Rails does just fine.</p> <p>Frankly, I wouldn't worry about limits to using Ruby on Rails (or any framework) until you hit real scalability problems. Build a <em>killer</em> app <em>first</em>, and then worry about scalability.</p> <p>CLARIFICATION: I'm thinking of things that Rails would have a hard-time supporting because it might require a fundamental shift in its architecture. I'll be generous and include some things that are part of the gem/plugin ecosystem such as foreign key enforcement or SOAP services.</p> <p>By two-phase commits, I mean attempting to make two commits to physically distinct servers within one transactional context.</p> <p>Use case #1 for a two-phase commit: you've clustered your database, so that you have 2 or more database servers and your schema is spread across both servers. You may want to commit to both servers, because you want to allow ActiveRecord think do a "foreign key map" that traverses across the different servers.</p> <p>Use case #2 for a two-phase commit: you're attempting to implement a messaging solution (sorry, I'm J2EE developer by day). The message producer commits to the messaging broker (one server) and to the database (a different server).</p>
    singulars
    1. This table or related slice is empty.
    1. POWhat are the limits of ruby on rails?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USAlan
    1. USAlan
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COWhile this is technically true, I believe you can use db middleware to achieve two-phase commits, or just use a db that supports it by itself and it will work fine. I'm not sure I'd call it a limitation, maybe just not a priority for the framework.
      singulars
      1. PO
      1. USPJ.
    2. COwhat exactly do you mean by 2 phase commits in this example?
      singulars
      1. PO
      1. USOrion Edwards
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload