Memory Leak in SQLite Auto-Extensions: Issue Overview When using SQLite’s sqlite3_auto_extension function to register multiple extensions in a C program, a memory leak can occur if proper cleanup mechanisms are not implemented. This issue manifests as "still reachable" memory reported by tools like Valgrind, indicating that memory allocated during the initialization of auto-extensions is not…
Crash Triggered by ZIP File Functions with Zero-Length Input Issue Overview The core issue involves a segmentation fault (SEGV) occurring in SQLite version 3.38.1 when attempting to process a zero-length BLOB input through the zipfile() table-valued function. The crash manifests during execution of the query: SELECT zipfile(‘test.zip’), mtime, data, method FROM zipfile(zeroblob(‘test.zip’)); This query passes…
Issue Overview: In-Memory Database Backup and Attachment Conflict The core issue revolves around the interaction between an in-memory SQLite database and its disk-based backup file. The application in question uses an in-memory database that periodically saves its state to a disk file using SQLite’s Online Backup API. During the application’s runtime, new data is incrementally…
Understanding SQLITE_PROTOCOL and SQLITE_CANTOPEN Errors in SQLite When working with SQLite in UWP (Universal Windows Platform) applications using C++/WinRT, developers may encounter specific SQLite error codes such as SQLITE_PROTOCOL (error code 15) and SQLITE_CANTOPEN (error code 14). These errors often stem from issues related to database file handling, permissions, and environment configuration. Below, we will…
Issue Overview: SQLite Hangs When Creating Database on NFSv3 Mount with Default VFS When attempting to create or access an SQLite database on an NFS (Network File System) mount using the default Unix VFS, the process may hang indefinitely at the sqlite3_exec function call. This issue arises specifically with NFS version 3 (NFSv3) and is…
Understanding the cksumvfs Checksum Failure During Database Operations The core issue revolves around the cksumvfs extension in SQLite, which is designed to add page-level checksums to a database for integrity verification. When attempting to migrate or modify an existing database using cksumvfs, users encounter checksum validation failures during operations like VACUUM. The failure manifests as…
Issue Overview: Legacy Encryption Compatibility in SQLite Version Upgrades The core challenge arises when attempting to open an RC4-encrypted SQLite database file in a newer SQLite version that no longer supports RC4 or the ChangePassword function. Historically, SQLite relied on third-party extensions or custom builds to implement encryption, with RC4 being a common choice due…
Issue Overview: PAMGuard SQLite Database Not Persisting Detection Data When using PAMGuard with SQLite as the backend database, users may encounter a situation where the expected detection data (e.g., whistle counts from audio files) is not being saved to the SQLite database file. This issue manifests as empty tables in the database, even though PAMGuard’s…
Understanding the Interaction Between VACUUM INTO, Page Size Configuration, and WAL Mode Issue Overview The SQLite VACUUM INTO command is designed to create a new database file by reorganizing and optimizing the contents of an existing database. This command is particularly useful for creating compact, efficient copies of databases without altering the original file. However,…
Understanding the Android SD Card Filesystem and SQLite Execution Constraints The core issue revolves around attempting to run SQLite on an Android device, specifically by placing the SQLite binary and database on an SD card. The user encounters a "Permission denied" error when trying to execute the SQLite binary from the SD card. This problem…