Development

Issue Overview: SQLite 3.37.0 Out-of-Memory (OOM) Bugs in sqlite3StrAccumEnlarge and sqlite3BtreeIndexMoveto The core issue revolves around two Out-of-Memory (OOM) bugs in SQLite version 3.37.0, specifically within the sqlite3StrAccumEnlarge and sqlite3BtreeIndexMoveto functions. These bugs manifest when executing specific SQL scripts that involve complex operations such as table creation, data insertion, and updates with nested queries. The…

Issue Overview: INT64 Literal Syntax Incompatibility with Borland C Compiler The core issue revolves around the incompatibility of the Borland C 5.5.1 compiler with the standard LL suffix used for defining 64-bit integer literals in SQLite. The LL suffix is a common convention in modern C compilers to denote a 64-bit integer literal. However, the…

Extending SQLite with Linear Algebra Types and Operations The idea of extending SQLite to support linear algebra operations directly within the database engine is an ambitious and intriguing proposition. This would involve introducing new data types, such as matrices and vectors, and defining operations like matrix multiplication, eigenvalue computation, and vector dot products. The goal…

Issue Overview: The Need for Parameterized Views and Virtual Tables in SQLite SQLite, while being a lightweight and powerful database engine, has certain limitations when it comes to creating parameterized views. A parameterized view is a view that accepts parameters, allowing for more dynamic and flexible querying. This is particularly useful when you want to…

Issue Overview: Assertion `pPg || !MEMDB’ Failure in SQLite The assertion pPg || !MEMDB’ failure in SQLite is a runtime error that occurs when the SQLite engine encounters an unexpected state during the execution of certain operations. This assertion is part of the SQLite debugging mechanism, designed to catch inconsistencies in the internal state of…

Understanding the Assertion pCtx->pParse->rc==SQLITE_OK Failure The assertion error pCtx->pParse->rc==SQLITE_OK is a critical failure in SQLite, indicating that the internal state of the SQLite parser (pParse) has encountered an unexpected condition. Specifically, the assertion checks whether the error code (rc) stored in the parser context (pParse) is equal to SQLITE_OK, which signifies no error. When this…

Understanding SQLite Connection Integrity in Long-Running Applications SQLite is renowned for its simplicity, reliability, and lightweight nature, making it a popular choice for embedded systems, mobile applications, and desktop software. However, one common concern among developers is whether SQLite connections can become corrupted or unusable over time, especially in long-running applications. This issue is particularly…

Issue Overview: SQLite3 Out-of-Memory Error with FTS3 and Specific Heap Limits The core issue revolves around an unexpected out-of-memory (OOM) error in SQLite3 when executing a sequence of SQL statements involving a virtual table created using the Full-Text Search version 3 (FTS3) module. The error occurs under specific conditions related to the hard_heap_limit pragma, which…

Issue Overview: Read-Only Mode Fails to Honor Custom Page and Block Sizes, Leading to Cursor Crashes When working with the lsm1 database engine in stand-alone mode, a critical issue arises when the database is opened in read-only mode. Specifically, the database fails to honor custom page and block sizes configured during its creation. This mismatch…

Issue Overview: sqlite3_txn_state Returns 1 After ROLLBACK When working with SQLite in WAL (Write-Ahead Logging) mode, developers often encounter nuanced behaviors related to transaction states, particularly when using the sqlite3_txn_state API. A common issue arises when sqlite3_txn_state returns a value of 1 (indicating an open read transaction) after a ROLLBACK operation, even though the expectation…