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Up until now, we ve been speaking about the access control and privilege verification systems strictly in terms of user accounts However, many other database vendors have implemented an alternate, more complex, account management subsystem The primary difference between MySQL and other popular vendors is that MySQL does not have a role-based implementation4 Sticking to their original goals for ease of use and simplicity, the MySQL developers have chosen not to overcomplicate the access control process by adding new layers of complexity to the grant system It is unlikely that you will see a role-based implementation in the near future However, that does not mean you should disregard the notion of account management by roles The concept is just as important, whether MySQL implements the roles systematically or leaves the implementation to your own devices Many of you who are systems administrators are already intimate with group-based account management.

At first, the BackgroundWorker component seems like the perfect solution to building multithreaded applications, and in many cases it is. The BackgroundWorker component makes particularly good sense when you have a single long-running task that executes in the background. But the BackgroundWorker doesn t provide some features, such as the following: The ability to manage multiple asynchronous tasks at once. For example, you can t run multiple prime-number queries at once (at least not without some ugly workarounds). The ability to communicate in ways other than sending a progress report or cancellation request. For example, you can t pause an in-progress task or supply new information. You re limited to the features baked into the BackgroundWorker. The ability to directly access and manipulate details about the background thread (such as its priority). If you re creating an application that needs these features, you need to step up to the System.Threading.Thread class. The Thread class represents a new thread of execution. To use the Thread class, you begin by creating a new Thread object, at which point you supply a delegate to the method you want to invoke asynchronously. As with the delegate examples and the

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AddParameter(command, name, dbType, 0, direction, false, 0, 0, sourceColumn, sourceVersion, value); } public void AddOutParameter(OracleCommand command, string name, OracleDbType dbType, int size) { AddParameter(command, name, dbType, size, ParameterDirection.Output, true, 0, 0, String.Empty, DataRowVersion.Default, DBNull.Value); } public void AddInParameter(OracleCommand command, string name, OracleDbType dbType) { AddParameter(command, name, dbType, ParameterDirection.Input, String.Empty, DataRowVersion.Default, null); } public void AddInParameter(OracleCommand command, string name, OracleDbType dbType, object value) { AddParameter(command, name, dbType, ParameterDirection.Input, String.Empty, DataRowVersion.Default, value); } public void AddInParameter(OracleCommand command, string name, OracleDbType dbType, string sourceColumn, DataRowVersion sourceVersion) { AddParameter(command, name, dbType, 0, ParameterDirection.Input, true, 0, 0, sourceColumn, sourceVersion, null); } protected OracleParameter CreateParameter(string name, OracleDbType dbType, int size, ParameterDirection direction, bool nullable, byte precision, byte scale, string sourceColumn, DataRowVersion sourceVersion, object value) { OracleParameter param = CreateParameter(name) as OracleParameter; ConfigureParameter(param, name, dbType, size, direction, nullable, precision, scale, sourceColumn, sourceVersion, value); return param; } protected virtual void ConfigureParameter(OracleParameter param, string name, OracleDbType dbType, int size, ParameterDirection direction, bool nullable, byte precision, byte scale, string sourceColumn, DataRowVersion sourceVersion, object value) { param.OracleDbType = dbType; param.Size = size; param.Value = (value == null) DBNull.Value : value; param.Direction = direction; param.IsNullable = nullable;

BackgroundWorker, a Thread object can point to only a single method. However, there s one basic limitation this method must accept no parameters and have no return value. In other words, it must match the signature of the System.Threading.ThreadStart delegate. ThreadStart asyncMethod = new ThreadStart(myMethod); Thread thread = new Thread(asyncMethod); Once you ve created the Thread object, you can start it on its way by calling the Thread.Start() method. This method returns immediately, and your code begins executing asynchronously on a new thread (not one of the threads in the CLR thread pool). thread.Start(); When the method ends, the thread is destroyed and cannot be reused. Table 20-1 lists the key properties of the Thread class.

All major server operating systems provide a mechanism to place user accounts into one or more usually function-oriented groups By function-oriented, we mean that the group s members generally share similar work goals: server administrators, power users, regular users, server daemons, and so on It is often helpful to think of the user accounts you manage for a MySQL database server in similar terms Users of the database server almost always can be categorized into groups based on the roles they play in the overall scheme of the database server s daily activity More than likely, if you already manage a MySQL database server, you, perhaps unknowingly, think in terms of role-based management When you add a new user account, you find out what the user will need to accomplish on a daily basis and which databases the account will need to access.

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