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14 lip 2024 · The only safe way to remove a WAL file is to open the database file using one of the sqlite3_open() interfaces then immediately close the database using sqlite3_close(). The WAL file format is precisely defined and is cross-platform.
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As per the SQLite docs, the DB-SHM file is a Shared Memory file, only present when SQLite it running in WAL (Write-Ahead Log) mode. This is because in WAL mode, db connections sharing the same db file must all update the same memory location used as index for the WAL file, to prevent conflicts.
24 paź 2013 · With WAL (Write-Ahead-Logging) enabled in SQLite 3.7 (which is the default for Core Data on iOS 7), how do I merge/commit the content from the -wal file back into the main database file?
Files On Disk. When in active use, the state of a WAL mode database is described by three separate files: The main database file with an arbitrary name "X". The write-ahead log file, usually named "X-wal". The wal-index file, usually named "X-shm". 1.1. The Main Database File.
2 lis 2024 · A comprehensive guide to SQLite's journal modes, including WAL, DELETE, TRUNCATE, PERSIST, MEMORY, and OFF. Understand the differences, use cases, and how to switch modes to optimize your SQLite database for performance, concurrency, and reliability.
Write-Ahead Log (WAL) Files. A write-ahead log or WAL file is used in place of a rollback journal when SQLite is operating in WAL mode. As with the rollback journal, the purpose of the WAL file is to implement atomic commit and rollback.
