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Friday, August 01, 2008 4:12 PM

Concurrency in SSDS

A common concern with SSDS, and a common question I get in many presentations I've given is how to handle concurrency and entity versioning. Suppose you have the following sequence of events: By default, SSDS will just accept the last Update and overwrite
Posted by eugeniop | 2 Comments
Thursday, May 08, 2008 11:12 AM

You don't have a beta account with SSDS, but you'd like to use the latest LitwareHR anyway

Well, too bad...No, seriously now, as I mentioned in a previous post , we developed a "mock" (but fully functional for LitwareHR's purposes) offline SSDS proxy to enable development independently from the live SSDS service. The offline proxy
Posted by eugeniop | 0 Comments
Tuesday, May 06, 2008 9:49 AM

LitwareHR on SSDS available for download

The latest version of LitwareHR is now available for download here . From our CodePlex site: This new enhanced version of LitwareHR includes the following new features: Upgraded codebase for SQL Server Data Services support New "DataModel" New
Posted by eugeniop | 4 Comments
Monday, May 05, 2008 2:25 PM

Paging in SSDS & Parallel Queries

Tim Jarvis raised a good point in my post on cross-container queries which is: how to handle paging? SSDS currently supports a very simple paging pattern that uses the entityId . By design, the first 500 entities will be returned, but the entities will
Posted by eugeniop | 1 Comments
Sunday, April 27, 2008 1:51 PM

End to end demo of LitwareHR on SSDS

Here's an end-to-end demo of LitwareHR using SSDS. The total demo lasts about 11 min and you will see: Tenant Provisioning and customization (takes the first 5 min approximately). I show the initial tenant provisioning (creation of a new tenant in LitwareHR,
Posted by eugeniop | 2 Comments
Tuesday, April 22, 2008 1:27 PM

More on parallel queries across containers in SSDS

Our current implementation of cross-Container queries follows a very common pattern and roughly looks like this (no exception handling shown for simplicity): public List<T> CrossContainerSearch( string [] containerIds, string query, SearchDelegate
Posted by eugeniop | 3 Comments
Monday, April 14, 2008 7:31 PM

LitwareHR on SSDS - Part V - Searching across Containers

In SQL Server Data Services, the scope of a query is bound to a Container , but in LitwareHR we had a requirement of searching entities across multiple tenants, and because in our implementation each tenant gets its own Container, we had to create a way
Posted by eugeniop | 10 Comments
Tuesday, April 01, 2008 2:43 PM

LitwareHR on SSDS - Part IV - Data access enhancements 2: developing offline

SQL Server Data Service is well...an online service. That means that you have to be connected to the network 100% of the time if you are using it. What if you are not connected? well...you know the whole story. Our goal while developing LitwareHR was
Posted by eugeniop | 5 Comments
Monday, March 24, 2008 4:50 PM

LitwareHR on SSDS - Part III - Data access enhancements 1: caching

In most applications, the distance (in terms of bandwidth and latency) between the store (the database) and the application logic (like the web servers and web services) is usually very small. The connectivity between these two components is usually very
Posted by eugeniop | 6 Comments
Wednesday, March 19, 2008 11:05 AM

LitwareHR on SSDS - Part II - The data access layer

The heart of LitwareHR implementation on SSDS is in it's data access layer of course. In fact, we created two different, but functionally equivalent implementations: one runs against SQL (LitwareHR's original implementation) and a second stack that runs
Posted by eugeniop | 6 Comments
Friday, March 14, 2008 3:52 PM

LitwareHR on SSDS - Part I - Multi-tenancy & Flexibility

SSDS's application model and features map quite nicely to our customization and multi-tenancy requirements in LitwareHR. A significant amount of code in LitwareHR is in the generic, multi-tenant, extensible data access. Our multi-tenant database performance
Posted by eugeniop | 7 Comments
Wednesday, March 05, 2008 9:32 PM

SQL Server Data Services - SSDS - New version of LitwareHR

Today, in his keynote, Ray Ozzie announced a new "cloud service" available from Microsoft: SQL Server Data Services (code name: Stika). It's a good that he announced it, because now I'm out of quarantine and I can talk about it :-). For the last 2 months
Posted by eugeniop | 13 Comments
 
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