Databases, systems programming, performance, and things I'm learning.https://low-level-luke.me/https://low-level-luke.me/posts/postgres-vacuum-freezing/https://low-level-luke.me/posts/postgres-vacuum-freezing/A short explanation of frozen rows, transaction ID wraparound, and why vacuum needs to freeze old tuple metadata.Wed, 13 May 2026 00:00:00 GMThttps://low-level-luke.me/posts/how-does-parquet-store-json-objects/https://low-level-luke.me/posts/how-does-parquet-store-json-objects/How Parquet represents nested JSON data using flattened columns, repetition levels, and definition levels.Mon, 11 May 2026 00:00:00 GMThttps://low-level-luke.me/braindumps/postgres-vacuum/https://low-level-luke.me/braindumps/postgres-vacuum/How PostgreSQL vacuum works, and what I got wrong along the wayMon, 04 May 2026 00:00:00 GMThttps://low-level-luke.me/braindumps/pax/https://low-level-luke.me/braindumps/pax/How PAX-style layouts and Parquet organize data for analytics, and what I got wrong along the waySun, 19 Apr 2026 00:00:00 GMThttps://low-level-luke.me/braindumps/2pl/https://low-level-luke.me/braindumps/2pl/How two-phase locking controls concurrent transactions, and what I got wrong along the waySat, 18 Apr 2026 00:00:00 GMThttps://low-level-luke.me/braindumps/database-concurrency-models/https://low-level-luke.me/braindumps/database-concurrency-models/How databases handle multiple clients at once, and what I got wrong along the waySun, 12 Apr 2026 00:00:00 GMThttps://low-level-luke.me/braindumps/paxos/https://low-level-luke.me/braindumps/paxos/How Paxos coordinates state across machines, and what I got wrong along the waySat, 11 Apr 2026 00:00:00 GMThttps://low-level-luke.me/braindumps/linearizability/https://low-level-luke.me/braindumps/linearizability/What linearizability means in distributed systems, and what I got wrong along the wayThu, 09 Apr 2026 00:00:00 GMThttps://low-level-luke.me/braindumps/sqlite/https://low-level-luke.me/braindumps/sqlite/How SQLite processes a query from SQL text to results, and what I got wrong along the wayWed, 08 Apr 2026 00:00:00 GMThttps://low-level-luke.me/braindumps/lsm-trees/https://low-level-luke.me/braindumps/lsm-trees/How LSM trees trade read performance for fast writes, and what I got wrong along the wayTue, 07 Apr 2026 00:00:00 GMThttps://low-level-luke.me/posts/finding-the-cost-of-a-tlb-miss/https://low-level-luke.me/posts/finding-the-cost-of-a-tlb-miss/Notes from the OSTEP homework on discovering TLB cache sizes and miss costsSun, 05 Apr 2026 00:00:00 GMT