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Figure 3-8. Recovery timeline During the recovery process, the transaction processing system must UNDO some of the log record changes and REDO others. The following steps are taken in order to restore the database state to its most current version: 1. Start at the most recent checkpoint in the log file (for our purposes here, the only checkpoint shown). The recovery process first adds all active transactions recorded in the checkpoint record to a list of UNDO transactions. This means that in our scenario, the T2 transaction is added to the UNDO list. 2. Read each log record in order from the checkpoint. For each START TRANSACTION record encountered, put that transaction in the UNDO list as well. For any COMMIT records encountered, move that transaction out of the UNDO list and into the REDO list. 3. REDO all the actions contained in the REDO list, ensuring that these operations are made permanent. 4. UNDO all the operations in the UNDO list, including any statements contained in that transaction that occurred before the checkpoint.

Finally there is the GameHelper class, a place into which generally useful functions can be added (similar to XNA s own MathHelper class). The class is declared as static, so it cannot be instantiated. For the moment, the class just contains a number of functions relating to random numbers. It hosts an instance of a Random object and exposes several overloads of a function called RandomNext, each of which returns a random number. There are two reasons for having these functions: They provide our game code with immediate access to random numbers (a common requirement for game development) without needing to instantiate its own Random instance. They add some useful overloads that return random float values, either between zero and a specified upper limit, or between an arbitrary lower and upper limit. They can be extremely useful when randomizing game objects because they use float variables for nearly all their properties.

Mover only permits the viewpoint to move forward and to rotate left or right. The meaning of forward depends on the viewpoint s current orientation. The constructor specifies a starting position for the viewpoint by calling doMove(): // global private TransformGroup targetTG; // the viewpoint TG

In this manner, checkpointing allows the system to restore the database to a consistent state, but does not need to read through all the database modifications recorded in the entire log file. Only those records after the checkpoint, and possibly a few records from before the checkpoint if an UNDO list is necessary, are required for restoration.4 One other topic that is often mentioned in regard to checkpointing relates to how the actual log file itself is maintained. Because of the way checkpointing essentially makes a piece of the log file (the oldest piece) obsolete, most transaction logging systems deploy a method of reusing segments of the log file in order to keep the log file from growing out of control. Steps are taken by the transaction processing system to ensure that no segments that would be critical in a restore situation are overwritten. In 5, we ll take an in-depth look at how InnoDB maintains the length of its transaction log and how it handles overflow situations where segments contain large transactions that cannot be truncated.

We will add further functionality to this class (and indeed to the whole framework) as we progress through the following chapters.

Some of you may be wondering how the MySQL binary log (binlog) comes into play during MySQL transaction processing The binary log replaces the old update log, and as of version 50, the update log is not available in packaged binaries The binary log is a significant improvement over the update log, and there is no functionality available in the update log that is not available in the binary log The binary log, similar to a transaction log, records every modification made to a MySQL table regardless of the storage engine This means that changes to non-transaction-safe tables, as well as InnoDB-affected data changes, are recorded as entries in the binary log In addition to all data modifications, the binary log will record some replication activities.

public Mover(TransformGroup vTG) { targetTG = vTG; doMove( new Vector3d(0, 0.5, 5.0) ); }