Rebuilding System Databases. Limitations and Restrictions When the master, model, msdb, and tempdb system databases are rebuilt, the databases are dropped and re-created in their original location.
If a new collation is specified in the rebuild statement, the system databases are created using that collation setting. Any user modifications to these databases are lost. For example, you may have user-defined objects in the master database, scheduled jobs in msdb, or changes to the default database settings in the model database. Lifetime of a LINQ to SQL DataContext - Dinesh's Cyberstation. One of the frequently asked questions is about the lifetime of a DataContext.
Should it be a long-lived, application-scoped object or should it be a short-lived, request-scoped object? Let's get to the answer by considering the key parameters: DataContext is ideally suited for a "unit of work" approach: Retrieve a bunch of objects through one or more queries, make changes to the resulting object graph based on user input (databound to controls) or some other request and then call SubmitChanges(). Where applicable, this can be a very efficient usage since all the changes in the unit of work are computed at once and the cost of query (or queries) is amortized over all the CUD operations. This is the case in case of a 2-tier app or in case of an SOA-type app where the service is sufficiently coarse-grained to allow this pattern.
SQL Server Developer Tools, Codename “Juneau” A Visual Explanation of SQL Joins. I love the concept, though, so let's see if we can make it work.
Assume we have the following two tables. Table A is on the left, and Table B is on the right. We'll populate them with four records each. id name id name -- ---- -- ---- 1 Pirate 1 Rutabaga 2 Monkey 2 Pirate 3 Ninja 3 Darth Vader 4 Spaghetti 4 Ninja Let's join these tables by the name field in a few different ways and see if we can get a conceptual match to those nifty Venn diagrams.