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SQLite will still default to the rollback journal method until you decide to switch your database to use the WAL. Unlike other PRAGMA settings, turning on the WAL is a persistent database-level change. This means you can turn on WAL in one program or from the SQLite command shell, and all other programs will then be using the database in WAL mode. This is very handy because it means you don t have to alter your applications to turn on WAL. The setting PRAGMA journal_mode=WAL is the command necessary to activate WAL. A call to this pragma will return as a string the final journal mode for the database. SQLite version 3.7.3 Enter ".help" for instructions Enter SQL statements terminated with a ";" sqlite> PRAGMA journal_mode=WAL; wal If the change to WAL is successful, the string wal is returned, as shown. If for some reason this fails, such as the underlying host not supporting the necessary shared memory requirements, the journal mode will be unchanged. For instance, on a default database, this means the command will return the string delete, meaning the rollback journal is still active.

IsNew is True; IsDirty is True; IsDeleted is False IsNew is False; IsDirty is False; IsDeleted is False IsNew is False; IsDirty is False; IsDeleted is False IsNew is False; IsDirty is False; IsDeleted is False IsNew is True; IsDirty is True; IsDeleted is False

As well as the journal_mode PRAGMA, several API options and related PRAGMAs are supported to control WAL and checkpoint behavior. sqlite3_wal_checkpoint(): Forces a checkpoint (also available as wal_checkpoint PRAGMA) sqlite3_wal_autocheckpoint(): Alters autocheckpoint page threshold (wal_autocheckpoint PRAGMA) sqlite3_wal_hook(): Registers a callback to be invoked when a program commits to the WAL.

Because the data portal takes care of these details, you can simply use the state properties without worrying about maintaining them yourself.

Note SOAP message interception and tampering is a serious security issue that will become more widely

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It s possible that some classes must be instantiated as root objects on some occasions and as child objects on others. You can handle this by implementing a set of Shared factory methods for the root model and another set for the child model. You also need to implement both the DataPortal_XYZ and Child_XYZ methods in the Data Access region.

With these options, it s possible to fine-tune WAL and checkpoint behavior to suit even the most unusual of applications.

Tip In most cases, the need for a switchable object indicates a flawed object model. Although there are exceptions for this that make sense, you should examine your object model carefully to see whether there s a simpler solution before implementing a switchable object.

Naturally, a change such as WAL brings with it its own advantages and disadvantages. We think that the advantages are significant, but it s best to be aware of impact so you can form your own judgment. Moving to WAL has the following advantages: Readers do not block writers, and writers do not block readers. This is the gold standard in concurrency management. WAL is flat-out faster in most operating scenarios, when compared to rollback journaling. Disk I/O becomes more predictable and induces fewer fsync() system calls. Because all WAL writes are to a linearly written log file, much of the I/O becomes sequential and can be planned accordingly.

understood (and worried about) once Web services become more commonly deployed and used by companies. If a thief steals your credit card or a document that contains your personal information, he has access to a legitimate source of credit, even though he is not an unauthorized user. SOAP message interception potentially creates the same security compromise scenario.

The template for creating a switchable object is the same as the editable root template, with the following exceptions: Dual factory methods Dual data access methods Let s discuss each change in turn.

To balance the equation, here are some of the notable disadvantages of WAL: All processing is bound to a single host. That is, you cannot use WAL over a networked file system like NFS. Using WAL introduces two additional semipersistent files, <yourdb>-wal and <yourdb>-shm, for the WAL and related shared memory requirements. This can be unappealing for those using SQLite databases as an application file format. This also affects read-only environments, because the shm file must be writable, and/or the directory in which the database exists. WAL performance will degrade for very large (approaching gigabyte) transactions. Although WAL is a high-performance option, very large or very long-running transactions introduce additional overhead.

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