Write-Ahead Log Provide durability guarantee without the storage data structures to be flushed to disk, by persisting every state change as a command to the append only log. aka: Commit Log Problem Strong durability guarantee is needed even in the case of the server machines storing data failing. Once a server agrees to perform an action, it should do so even if it fails and restarts losing all of
1. Overview The default method by which SQLite implements atomic commit and rollback is a rollback journal. Beginning with version 3.7.0 (2010-07-21), a new "Write-Ahead Log" option (hereafter referred to as "WAL") is available. There are advantages and disadvantages to using WAL instead of a rollback journal. Advantages include: WAL is significantly faster in most scenarios. WAL provides more con
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