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This scenario is one of the reasons why this kind of solution is not recommended in a client/server environment In the optimistic locking scenario, user A locks the record only while he or she is actually performing the change A mechanism in SQL Server notifies a user if somebody has changed the record in the meantime The user can then decide either to abandon changes or to overwrite the record A simple way to find out if somebody has changed the record since user A read it would be to compare all fields To run this comparison, user A must keep both an original and a changed record, and he or she needs to send them both to the server Then a process on the server must compare the original record with the record in the table to make sure that it wasn t changed.

As we will see in the section on the lock manager, pages of an index use a slightly different locking mechanism than regular data pages.

Only then can the record be updated This process is obviously slow and it increases network traffic, but there are solutions in the industry that use precisely this method..

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There is no need to serve the user with 5000 records that he or she will not review Index An additional benefit of splitting tables to provide one table for data modification and another for querying is that the indexes you would need to create on the denormalized tables will not slow down data modification transactions Stored procedures vs ad hoc queries Because of the many performance and management reasons discussed earlier, in Reuse of Stored Procedure Execution Plans in 3, you should use precompiled objects such as stored procedures as much as you can Often, you can significantly simplify a query by dynamically assembling it When you reduce the number of tables and parameters, the query optimizer creates a better execution plan Search types Good results can sometimes be achieved by using a little psychology.

SQL Server has a timestamp datatype. It is used for versioning records in a table. When you insert or update a record in a table with a timestamp field, SQL Server timestamps the change. Figure 10-2 demonstrates such behavior. The table is created with a timestamp field. When a record is inserted, SQL Server automatically sets its value. When the record is updated, SQL Server increases the value of the timestamp.

10:

Figure 10-2.

It is important to realize that timestamp values are not actually a kind of timekeeping. They are just binary values that are increased with every change in the database, and therefore they are unique within the database. You should not make any assumptions about their values and growth. Somebody (or some process) might change something in the database concurrently, and even two changes that you executed consecutively might not have consecutive timestamp values. To make sure that nobody has changed a record in the meantime, you might decide to update it like this:

update #aTable set description = 'test3' where id = 1 and ts = 0x000000000000007A -- not a perfect solution

The record will be updated only if the timestamp is unchanged. The trouble with this solution is that you will not know what

For example, users do not always need to do a Contains search on a string (like '%string%') Most of the time, Begins with (like 'string%') and Match (='string') searches are sufficient For the latter two, SQL Server.

happens after the statement is executed. Maybe everything is okay and the record has been successfully changed. It is possible that the record was not updated, because the timestamp was changed, but it is also possible that the record is not in the table any more.

from sysobjects where xType = 'U' Open @curTables -- get first table Fetch Next From @curTables Into @chvTable -- if we successfully read the current record While (@@fetch_status = 0) Begin -- assemble DOS command for exporting table Set @chvCommand = 'bcp "Asset..[' + @chvTable + ']" out C:\sql7\backup\' + @chvTable + '.txt -c -q -Sdejan -Usa -Pdejan' -- during test just display command If @debug <> 0 Select @chvCommand chvCommand -- in production execute DOS command and export table If @debug = 0 Execute xp_cmdshell @chvCommand, NO_OUTPUT Fetch Next From @curTables Into @chvTable End Close @curTables Deallocate @curTables Return 0

If you execute this stored procedure (without specifying the @debug parameter), SQL Server will execute the following sequence of command prompt commands to export tables:

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