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The System.Threading namespace defines a Timer class, which you can use to have a thread pool thread call a method periodically . When you construct an instance of the Timer class, you are telling the thread pool that you want a method of yours called back at a future time that you specify . The Timer class offers several constructors, all quite similar to each other:

Each interim set generated by both the anchor member and the recursive member is spooled in a hidden temporary table (the Table Spool operator). You can also notice later in the plan that a temporary index is created (indicated by the Index Spool operator). The index is created on the iteration counter plus the attributes retrieved (EmployeeID, ReportsTo, FirstName, LastName). The interim set of each invocation of the recursive member is retrieved using index seek operations in the covering index I created for the query. The Nested Loops operator invokes a seek for each manager returned and spooled in the previous level, to fetch its direct subordinates. The Assert operator checks whether the iteration counter exceeds 100 (the default MAXRECURSION limit). This is the operator in charge of breaking the query in case the number of recursive member invocations exceeds the MAXRECURSION limit. The Concatenation operator concatenates (unifies) all interim result sets. When you're done testing and experimenting with the recursive CTE, drop the index created for this purpose: DROP INDEX dbo.Employees.idx_mgr_emp_ifname_ilname;

Use sizeof() to determine the size of a variable in a memory allocation It s easier to use sizeof() than to look up the size in a manual, and sizeof() works for structures you create yourself, which aren t in the manual. sizeof() doesn t carry a performance penalty since it s calculated at compile time. It s portable recompiling in a different environment automatically changes the value calculated by sizeof(). And it requires little maintenance since you can change types you have defined and allocations will be adjusted automatically.

10

Figure 10-7 You can open Windows Firewall from Control Panel or Security Center, as well as the Start menu.

The same levels of transactional isolation are supported in both JDBC and ADO.NET. In ADO.NET, these are specified using members of the System.Data.IsolationLevel enumeration, which includes the following values: ReadCommitted, ReadUncommitted, RepeatableRead, and Serializable. JDBC defines optional support for distributed transactions through the XAConnection and XADataSource interfaces. For both the SQL and OLE Data Provider implementations, the IDbTransaction functionality maps directly to the transactional capabilities of the underlying data source and is not integrated with any distributed transaction manager. The DBDemo.InsertPeople method creates an IDbTransaction instance to ensure that all records are inserted into the people table atomically. Note that the transaction is created with no arguments, resulting in the default isolation level (ReadCommitted) being utilized. Also, the IDbTransaction instance must be assigned to the Transaction property of the IDbCommand prior to execution to enlist the command in the active transaction. If an exception occurs during the insertion of any of the records, the catch clause will execute and the partially executed transaction will be rolled back by the code contained in the catch clause calling the IDbTransaction.Rollback method.

WITH Tiles AS ( SELECT groupid, val, NTILE(2) OVER(PARTITION BY groupid ORDER BY val) AS tile FROM dbo.Groups ), GroupedTiles AS ( SELECT groupid, tile, COUNT(*) AS cnt, CASE WHEN tile = 1 THEN MAX(val) ELSE MIN(val) END AS val FROM Tiles GROUP BY groupid, tile )

unhandled exception . The CLR will then terminate your process, which is good because all the corrupted state will now be destroyed . This is much better than having your application continue to run with unpredictable results and possible security holes . Personally, I think the C# team should have chosen different language keywords for the exception-handling mechanism . What programmers want to do is try to execute some piece of code . And then, if something fails, either recover from the failure and move on or compensate to undo some state change and continue to report the failure up to a caller . Programmers also want to have guaranteed cleanup no matter what happens . The code on the left is what you have to write to make the C# compiler happy, but the code on the right is the way I prefer to think about it: