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Overview The default method by which SQLite implements atomic commit and rollback is a rollback journal. Beginning with version 3.
There are advantages and disadvantages to using WAL instead of a rollback journal. WAL is significantly faster in most scenarios. WAL provides more concurrency as readers do not block writers and a writer does not block readers.
Reading and writing can proceed concurrently. WAL uses many fewer fsync operations and is thus less vulnerable to problems on systems where the fsync system call is broken.
But there are also disadvantages: All processes using a database must be on the same host computer; WAL does not work over a network filesystem.
Transactions that involve changes against multiple ATTACHed databases are atomic for each individual database, but are not atomic across all databases as a set. You must be in a rollback journal mode to change the page size.
It is not possible to open read-only WAL databases. The opening process must have write privileges for "-shm" wal-index shared memory file associated with the database, if that file exists, or else write access on the directory containing the database file if the "-shm" file does not exist.
There is an additional quasi-persistent "-wal" file and "-shm" shared memory file associated with each database, which can make SQLite less appealing for use as an application file-format.
There is the extra operation of checkpointing which, though automatic by default, is still something that application developers need to be mindful of. WAL works best with smaller transactions. WAL does not work well for very large transactions.
For transactions larger than about megabytes, traditional rollback journal modes will likely be faster. It is recommended that one of the rollback journal modes be used for transactions larger than a few dozen megabytes.
How WAL Works The traditional rollback journal works by writing a copy of the original unchanged database content into a separate rollback journal file and then writing changes directly into the database file.
In the event of a crash or ROLLBACKthe original content contained in the rollback journal is played back into the database file to revert the database file to its original state.
The WAL approach inverts this. The original content is preserved in the database file and the changes are appended into a separate WAL file.AHEAD offers a full spectrum of services to accelerate and guide your public cloud journey. Strategy Establish your guiding objectives, strategy, and roadmap for the public cloud.
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