Write-Ahead Logging - SQLite
2024年7月14日 · 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.
WAL-mode File Format - SQLite
2024年9月19日 · This leaves the database in a state that allows other processes without write permission on the database, WAL, or WAL-index files to open the database read-only.
Recover snapshots from a wal file - SQLite
This function attempts to scan the WAL file associated with database zDb of database handle db and make all valid snapshots available to sqlite3_snapshot_open(). It is an error if there is already a read transaction open on the database, or if the database is not a WAL mode database.
Temporary Files Used By SQLite
2022年1月8日 · The temporary database file used to store TEMP tables is deleted automatically when the database connection is closed using sqlite3_close(). The TEMP database file is very similar to auxiliary database files added using the ATTACH statement, though …
SQLite User Forum: How to open a WAL-enabled db file with the …
2023年8月10日 · Modern emcc builds ours with WAL now, and that's what will be delivered with 3.43, but it fails to open any WAL-mode db (with SQLITE_CANTOPEN). Figuring out what needs to change to make that work near the top of my TODO list.
Write-Ahead Logging - SQLite
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.
Database File Format - SQLite
2024年11月29日 · The WAL is always located in the same directory as the database file and has the same name as the database file but with the string "-wal" appended. 4.1. WAL File Format
SQLite: Wal2 Mode Notes
2 天之前 · In wal2 mode, the system uses two wal files instead of one. The files are named "<database>-wal" and "<database>-wal2", where "<database>" is of course the name of the database file. When data is written to the database, the writer begins by appending the new data to the first wal file.
SQLite User Forum: Why WAL file (-wal) may disappear?
2021年9月1日 · I have an Android app using SQLite via c++ bridge (using JNI/NDK). I'm trying to store data in SQLite database with WAL mode on. However most of the time the WAL file is either missing either empty (0 bytes size). Why can it possible happen? Details: PRAGMA journal_mode=WAL;
SQLite User Forum: WAL with Read Only Access
2022年1月18日 · If you really have a use-case for a read-only DB, then store the DB file in a read-only location, and before using it from a new connection, first copy the DB file to a temp folder (with read-access), OR serialize it into memory then open that temporary/memory DB and read it to your heart's content.