![]() SQLite ArchitectureSQLite is embedded in the host application process: instead of communicating with a database server across process boundaries, applications use SQLite by calling SQLite library functions. Their extensive test suite (consisting of fuzz, boundary value, regression, I/O, out-of mem testing) allowed them to quickly integrate the optimizations into a release build without worrying of breaking other components of the library. The ease of profiling SQLite's execution engine enabled the team to pinpoint which virtual instructions were responsible for the bottlenecks, and also to watchout for performance regression issues. Performance and correctness monitoring is a prime factor in development velocity. Throughout the paper, we see time and again how SQLite benefits from its informative profiling utilities and aggressive testing to identify and implement optimizations quickly. It is technically easy to read yet very fulfilling. This is a sweet little paper (befitting SQLite's fame). As a result of the optimizations implemented, SQLite is now up to 4.2X faster on the Star Schema Benchmark (SSB). ![]() This paper, which appeared in VLDB'22 a couple weeks ago, delves into analytical data processing on SQLite, identifying key bottlenecks and implementing suitable solutions. The concept art in this blog post are creations of Stable Diffusion. SQLite is truly the little database engine that could. There are over 600 lines of test code for every line of code in SQLite. Due to its reliability, SQLite is used in mission-critical applications such as flight software. ![]() Yet, SQLite can support tens of thousands of transactions per second. With all features enabled, the compiled library size can be less than 750 KiB. a single C library consisting of 150K lines of code. It has an in-process/embbedded design, and a standalone (no dependencies) codebase. SQLite is a single node and (mostly) single threaded online transaction processing (OLTP) database. (If you are on a Mac laptop, you can open a terminal, type "sqlite3", and start conversing with the SQLite database engine using SQL.) There are likely over one trillion SQLite databases in active use. It is found in nearly every smartphone (iOS and Android), computer, web browser, television, and automobile. SQLite is the most widely deployed database engine (or likely even software of any type) in existence.
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