Sqlite Shared Cache Write Ahead Logging

Beginning with version (), a new "Write-Ahead Log" option There is an additional quasi-persistent "-wal" file and "-shm" shared memory file .. the WAL file multiple times if the transaction grows larger than the page cache . The write-ahead log or "wal" file is a roll-forward journal that records file and use it as shared memory for coordinating access to the database and as a cache .


The journal is simply the name of the write-ahead log. The journal What is the difference between a journaling vs a log structured file system?. In computer science, write-ahead logging (WAL) is a family of techniques for providing atomicity use a variant of WAL for at least file system metadata called journaling. article is a stub. You can help Wikipedia by expanding it. v · t · e.


This article describes the various temporary files that SQLite creates and uses. . same name as the database file except with the 4 characters "-shm" appended. The WAL-Index File Format The WAL-index or "shm" file is used to coordinate access to the database by multiple clients, and as a cache to help clients quickly .


When auto-commit is on, it means that SQL transactions are: The underlying sqlite3 library operates in autocommit mode by default, but the. Autocommit should be disabled if multiple operations belong together logically to ensure that not only some of them are executed (atomicity).


Can I use SQLite in my web app? I've heard it doesn't do concurrency. SQLite does support multiple concurrent connections, and therefore it. locks at the same time, hence there can be many simultaneous readers. .. soon as all operations associated with the current database connection complete .


I implemented write ahead logging, allowing recovery of the in-memory state upon server restart. While the idea itself is really simple. Derby implements the Write Ahead Log using about current implementation of recovery.

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