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Create Procedure prGetSequenceNumber -- return next Id for selected table -- and increment the value in SequenceNumbers table @chvTableName sysname, @intId int Output As -- read next Id Select @intId = SequenceNumber

From SequenceNumbers Where Tablename = 'a table' -- increment SequenceNumber Update SequenceNumbers Set SequenceNumber = @intId + 1 Where Tablename = 'a table' Return

For example, it could happen that we have two processes on a server that need to insert a record into table a. One process might read a record from the SequenceNumbers table. Let s assume that the second process is just a little behind and that it manages to read a record before the first process can do anything else. Each of them places a shared lock on the record. Such a lock allows other processes to read the record but prevents them from updating it until the originating process finishes. Unfortunately, the first process cannot update this record any more because of the lock placed on it by the second process, and the second process cannot update the record because of the lock by the first process. Each will wait for the other process to give up. This situation is called a deadlock. SQL Server has a mechanism that will eventually kill one of the processes so that the other one can continue. The trouble is that the client application needs to execute everything again, and that valuable time has been lost. The standard way to avoid such deadlock is to place a hint in the From clause of the Select statement that will force SQL Server to put an update lock instead of a shared lock on a record. An update lock will prevent other processes from reading and putting locks on a record until the originating process is complete. Thus, the second process will wait until the first process is finished. Processes are thus serialized.

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Figure 1-4.

Create Procedure prGetSequenceNumber -- return next Id for selected table -- and increment the value in SequenceNumbers table @chvTableName sysname, @intId int OUTPUT

10:

One of the major disadvantages of file-server architecture is high network traffic due to the fact that entire files are being transferred across the network. If a client/server system is well designed, the client will receive just the information it needs, which is usually just a slight portion of the database, thus significantly reducing the network traffic. If a client/server system is implemented with even more of the processing/business logic on the server (that is, using stored procedures), even less data will be transferred back and forth through the network.

The syntax of triggers in SQL Server 2000 is just a little more complicated than in SQL Server 7.0:

Create Trigger trigger_name On {table | view} [With Encryption] { {{For | After | Instead Of} { [Delete] [,] [Insert] [,] [Update] } [With Append] [Not For Replication] As

sql_statement [...n]

} | {(For | After | Instead Of) { [Insert] [,] [Update] } [With Append] [Not For Replication] As { If Update (Column) [{And | Or} Update (Column)] [...n] | If (Columns_Updated() {bitwise_operator} updated_bitmask) { comparison_operator} column_bitmask [...n] }

sql_statement [...n]

Stored procedures have several performance advantages over ad hoc queries. Stored procedures are cached in a compiled form on the database server, so when they need to be used, the server does not have to parse and recompile them again. A developer can optimize a stored procedure s code so that every user will use the best possible method to perform an action.

Basically, there are two important changes:

There is a new type of trigger the instead-of trigger. Note the new keyword (Instead Of). The old type of trigger is now called an after trigger. You should use the new keyword (After) when creating them. The old keyword (For) can still be used for compatibility reasons, but it is not recommended.

9:

It is possible to create an instead-of trigger on a view (not just on a table).

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