Write Ahead Logging with SQLite, also known as WAL, is the standard method that states how SQLite implements the rollback and commit processes with this mobile database system. The disk access and input and output operations are more sequential, using the WAL methods. Using WAL will involve less of the fsync() functions and operations. It means it is more likely to work properly on different operating systems and smartphones. WAL is faster on most operations and provides better concurrencies, as there are no conflicts with processes reading and writing at the same time with a big reduction in any data block.

As much as there are advantages, there are also limitations to this method. WAL does not work efficiently with very large transactions, but much better with smaller transactions. For transactions of around 100 megabytes, it will work fine, but over a gigabyte, it will start to reduce its efficiency. There is also another issue: WAL could fail operations...