SQLite 3.34.0 FTS5 Index Corruption During DELETE Operations The issue at hand revolves around SQLite 3.34.0 causing database corruption when executing DELETE operations on FTS5 (Full-Text Search) indexes. This corruption manifests as a "database disk image is malformed" error, specifically when the sqlite3_step function returns SQLITE_CORRUPT. The problem was identified during the execution of the…
SQLite Compilation for Limited Command Execution SQLite is a versatile and lightweight database engine that supports a wide range of SQL commands, including CREATE TABLE, INSERT, DELETE, and ALTER. However, in certain specialized use cases, such as blockchain systems, the ability to modify or delete data after it has been written is undesirable. Blockchain systems…
SQLite Database File Remains Empty After CREATE TABLE Operation When working with SQLite in conjunction with Perl and the DBI (Database Interface) module, a common issue arises where the database file remains empty after executing a CREATE TABLE operation. This problem is particularly perplexing because the Perl script reports successful execution of the SQL statements,…
Missing ARM64 Architecture in libsqlite3.dylib on macOS M1 The transition to Apple’s M1 chip, based on the ARM64 architecture, has introduced significant changes in how software is compiled and executed on macOS. One of the challenges developers face is ensuring that their applications, including dependencies like SQLite, are compatible with both Intel (x86_64) and ARM64…
Atomicity Challenges in Multi-Database Transactions When working with SQLite, one of the most critical aspects to consider is the atomicity of transactions, especially when these transactions span multiple databases. Atomicity ensures that a series of operations either complete entirely or not at all, which is crucial for maintaining data integrity. In scenarios where an application…
SQLite .expert Command Misinterprets Generated Columns in Queries and Views The .expert command in SQLite is a powerful tool designed to analyze queries and suggest optimal indexes for improving performance. However, a critical issue arises when the .expert command is used in conjunction with queries or views that reference generated columns. Generated columns, introduced in…
SQLite Build Failure with Thread Safety Disabled When building SQLite with thread safety explicitly disabled, a common issue arises where the build process fails due to a missing reference to pthread_create(). This issue is particularly prevalent when using the sqlite-autoconf-3340000.tar.gz package, where the build system does not automatically add the -DSQLITE_THREADSAFE=0 flag to the compiler…
Unixepoch Timestamp Misinterpretation in UTC Conversion The issue at hand revolves around the misinterpretation of Unix epoch timestamps when using the datetime function in SQLite with the unixepoch and utc modifiers. Specifically, the problem arises when a Unix epoch timestamp, which is inherently in UTC, is passed to the datetime function along with the utc…
SQLite CHECK Constraint Failure on Trigger-Generated Integer Values When working with SQLite, one common issue arises when attempting to enforce constraints on columns that are populated or modified by triggers. Specifically, the problem occurs when a CHECK constraint is applied to a column that is expected to contain integer values, but the trigger generates a…
Immutable Columns: The Need for Write-Once, Read-Many Semantics In database design, there are scenarios where certain columns should be immutable after their initial insertion. These columns, often referred to as "constant" columns, are designed to hold values that should not change once they are set. This requirement is common in use cases such as audit…