Issue Overview: Backing Up SQLite Database Without SSH Access When managing a database-driven website using SQLite, one of the critical tasks is ensuring that the database is backed up regularly and can be accessed locally for development or analysis. However, this task becomes challenging when you do not have SSH access to the web server…
Issue Overview: SQLite Object Reference Search Order and Documentation Ambiguities The core issue revolves around the documentation on SQLite’s object reference search order, specifically how SQLite handles unqualified object references (tables, views, triggers, etc.) across multiple databases. The current documentation on the SQLite Naming Documentation Page states that if no database is specified in an…
BLOOM Filter Overhead in Recursive CTE Queries and UNION ALL View Index Selection Failure 1. Core Mechanics of Recursive CTE Execution and View-Based Index Utilization The problem manifests in two distinct but related phases involving SQLite’s query optimizer decisions. First, the recursive Common Table Expression (CTE) with BLOOM filter usage demonstrates severe performance degradation compared…
Schema Qualification Ambiguity in Trigger Definitions The core issue revolves around how SQLite parses and enforces schema qualifications in trigger definitions, particularly when interacting with attached databases and temporary schemas. When a trigger is created on a table in the main schema (e.g., main.x), SQLite allows the schema-qualified syntax in the ON clause. However, complications…
OPFS File Persistence Failure in SQLite WebAssembly Applications When integrating SQLite with WebAssembly (WASM) in Progressive Web Apps (PWAs), developers often encounter scenarios where database files created via the sqlite3-worker1-promiser.js API fail to persist in the Origin Private File System (OPFS). This manifests as empty file systems in tools like Chrome’s OPFS Explorer, even though…
Data Structure and Pivoting Requirements The core challenge involves restructuring a dataset to transform distinct values from one column into multiple columns, aggregating counts dynamically. The original table (t) contains three columns: id: A unique identifier (integer primary key) j: A categorical variable with 768 distinct values (e.g., ‘foo’, ‘bar’, ‘baz’) y: A year value…
Issue Overview: Persistent Local Storage in Remote JS Applications with SQLite The core issue revolves around implementing a persistent local storage solution for a JavaScript (JS) web application hosted on a remote server, where the application itself does not run on the server but is merely served to the client. The primary challenge is to…
Understanding the Error 13 in SQLite with Large OFFSET Queries When working with SQLite, particularly in embedded systems or environments with limited resources, encountering Error 13 ("disk or db full") during a SELECT query with a large OFFSET can be both confusing and frustrating. This error typically indicates that SQLite is unable to allocate the…
SIGSEGV During ANALYZE on a 13 Billion Record Database Issue Overview The core issue revolves around a segmentation fault (SIGSEGV) occurring when running the ANALYZE command on an SQLite database containing over 13 billion records, totaling approximately 3.5 terabytes in size. The segmentation fault manifests specifically when SQLite is compiled with the SQLITE_ENABLE_STAT4 option enabled….
Understanding the Need for ROWID Metadata in Query Projections The core issue revolves around the absence of a dedicated SQLite C API to retrieve the ROWID or equivalent primary key metadata for rows in query results (referred to as "projections"). Existing APIs such as sqlite3_column_table_name() and sqlite3_column_database_name() provide metadata about the source of column values,…