https://jinlog.dev/Recent content on Jin's 블로그Hugoko-krSun, 27 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/mongodb/01-wiredtiger-architecture/Sun, 27 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/mongodb/01-wiredtiger-architecture/스토리지 엔진 API, dbPath 파일과 ident, WiredTiger B-tree와 압축, 캐시 크기와 evictionhttps://jinlog.dev/posts/postgresql/patroni-01-architecture/Sat, 26 Sep 2026 08:00:00 +0900https://jinlog.dev/posts/postgresql/patroni-01-architecture/DCS와 leader key, HA loop, failover 판단https://jinlog.dev/posts/postgresql-ops/01-diagnostic-toolkit/Sat, 26 Sep 2026 08:00:00 +0900https://jinlog.dev/posts/postgresql-ops/01-diagnostic-toolkit/미리 켜 둘 로그 설정, pg_stat_activity와 wait event, pg_stat_statements, pg_stat_iohttps://jinlog.dev/posts/postgresql/01-process-architecture/Thu, 24 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/postgresql/01-process-architecture/postmaster, backend, 백그라운드 프로세스들의 역할https://jinlog.dev/posts/mongodb/02-checkpoint-and-journal/Sun, 27 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/mongodb/02-checkpoint-and-journal/60초 체크포인트, journal의 WiredTiger 로그, j 옵션과 journal flush, kill -9 뒤 복구, PostgreSQL WAL과의 차이https://jinlog.dev/posts/postgresql-ops/02-blocked-sessions/Sat, 26 Sep 2026 18:00:00 +0900https://jinlog.dev/posts/postgresql-ops/02-blocked-sessions/락 대기, DDL이 만드는 락 큐, deadlock, lock_timeouthttps://jinlog.dev/posts/postgresql/patroni-02-setup/Sat, 26 Sep 2026 08:00:00 +0900https://jinlog.dev/posts/postgresql/patroni-02-setup/etcd, patroni.yml, HAProxy, switchover와 failoverhttps://jinlog.dev/posts/postgresql/02-memory-architecture/Thu, 24 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/postgresql/02-memory-architecture/shared buffers, work_mem, WAL buffershttps://jinlog.dev/posts/mongodb/03-mvcc-and-snapshot/Sun, 27 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/mongodb/03-mvcc-and-snapshot/update chain, 트랜잭션 스냅샷과 timestamp, WriteConflict, history store, minSnapshotHistoryWindowInSeconds, transactionLifetimeLimitSecondshttps://jinlog.dev/posts/postgresql-ops/03-sudden-slow-query/Sat, 26 Sep 2026 19:00:00 +0900https://jinlog.dev/posts/postgresql-ops/03-sudden-slow-query/plan 변경, 통계, generic plan, auto_explainhttps://jinlog.dev/posts/postgresql/patroni-03-operations/Sat, 26 Sep 2026 08:00:00 +0900https://jinlog.dev/posts/postgresql/patroni-03-operations/설정 변경, DCS 장애, 데이터 유실, split-brain, slothttps://jinlog.dev/posts/postgresql/03-storage-layout/Thu, 24 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/postgresql/03-storage-layout/페이지 레이아웃, 튜플 구조, TOASThttps://jinlog.dev/posts/mongodb/04-index-and-query-planner/Sun, 27 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/mongodb/04-index-and-query-planner/KeyString과 RecordId, 후보 계획의 trial 실행과 점수, plan cache의 inactive/active와 replan, ESR, 커버링 쿼리, classic과 SBEhttps://jinlog.dev/posts/postgresql-ops/04-long-transactions/Sat, 26 Sep 2026 19:05:00 +0900https://jinlog.dev/posts/postgresql-ops/04-long-transactions/xmin horizon이 멈추는 원인과 찾는 법https://jinlog.dev/posts/postgresql/04-mvcc/Thu, 24 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/postgresql/04-mvcc/xmin/xmax, 스냅샷, 튜플 가시성 판단https://jinlog.dev/posts/mongodb/05-oplog-and-replication/Sun, 27 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/mongodb/05-oplog-and-replication/oplog 엔트리의 구조와 멱등성, OplogFetcher에서 OplogApplier까지의 복제 파이프라인, 복제 지연, oplog 크기와 windowhttps://jinlog.dev/posts/postgresql-ops/05-table-bloat/Sat, 26 Sep 2026 19:20:00 +0900https://jinlog.dev/posts/postgresql-ops/05-table-bloat/bloat 측정, autovacuum 튜닝, REINDEX CONCURRENTLYhttps://jinlog.dev/posts/postgresql/05-vacuum/Thu, 24 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/postgresql/05-vacuum/dead tuple, FSM, Visibility Maphttps://jinlog.dev/posts/mongodb/06-election/Sun, 27 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/mongodb/06-election/heartbeat와 election timeout, dry run과 term, 투표 규칙, stepDown과 election handoff, priority takeover, 네트워크 분할https://jinlog.dev/posts/postgresql-ops/06-disk-full/Sat, 26 Sep 2026 19:24:00 +0900https://jinlog.dev/posts/postgresql-ops/06-disk-full/pg_wal 증가, temp file, 디스크가 가득 찼을 때의 동작https://jinlog.dev/posts/postgresql/06-xid-wraparound/Thu, 24 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/postgresql/06-xid-wraparound/왜 생기고 어떻게 막는가https://jinlog.dev/posts/mongodb/07-sharding/Sun, 27 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/mongodb/07-sharding/mongos와 config server, shard key와 chunk, balancer와 chunk migration, 쿼리 라우팅, shard version과 StaleConfig, orphan과 range deleterhttps://jinlog.dev/posts/postgresql-ops/07-wraparound-warning/Sat, 26 Sep 2026 19:31:00 +0900https://jinlog.dev/posts/postgresql-ops/07-wraparound-warning/경고 단계와 쓰기 거부, 강제 VACUUM 대응https://jinlog.dev/posts/postgresql/07-wal/Thu, 24 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/postgresql/07-wal/LSN, full page writes, WAL 레코드 구조https://jinlog.dev/posts/mongodb/08-read-write-concern/Sun, 27 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/mongodb/08-read-write-concern/write concern 대기와 majority commit point, 8.0의 기본 write concern, read concern별 읽기 시점, causal consistency, rollback과 rollback 파일https://jinlog.dev/posts/postgresql-ops/08-standby-lag/Sat, 26 Sep 2026 19:35:00 +0900https://jinlog.dev/posts/postgresql-ops/08-standby-lag/write/flush/replay lag, hot standby 충돌https://jinlog.dev/posts/postgresql/08-checkpoint-and-recovery/Thu, 24 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/postgresql/08-checkpoint-and-recovery/체크포인트가 하는 일과 장애 후 복구가 진행되는 순서, PITR의 원리https://jinlog.dev/posts/postgresql-ops/09-connection-failures/Sat, 26 Sep 2026 19:39:00 +0900https://jinlog.dev/posts/postgresql-ops/09-connection-failures/too many clients, 예약 슬롯, 인증 실패https://jinlog.dev/posts/postgresql/09-streaming-replication/Thu, 24 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/postgresql/09-streaming-replication/walsender와 walreceiver, 동기 복제, hot standby 충돌, replication slothttps://jinlog.dev/posts/postgresql-ops/10-checkpoint-io/Sat, 26 Sep 2026 19:45:00 +0900https://jinlog.dev/posts/postgresql-ops/10-checkpoint-io/잦은 체크포인트, pg_stat_checkpointer, bgwriterhttps://jinlog.dev/posts/postgresql/10-query-processing/Thu, 24 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/postgresql/10-query-processing/파서, 분석기, 리라이터, 플래너, 실행기와 통계 정보https://jinlog.dev/posts/postgresql-ops/11-out-of-memory/Sat, 26 Sep 2026 19:53:00 +0900https://jinlog.dev/posts/postgresql-ops/11-out-of-memory/work_mem, OOM으로 backend가 죽을 때의 크래시 재시작https://jinlog.dev/posts/postgresql-ops/12-data-corruption/Sat, 26 Sep 2026 19:56:00 +0900https://jinlog.dev/posts/postgresql-ops/12-data-corruption/checksum 오류, amcheck, 손상 범위 파악https://jinlog.dev/posts/postgresql/extension-internals/Fri, 25 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/postgresql/extension-internals/공유 라이브러리와 fork 같은 OS 배경지식부터 CREATE EXTENSION, 라이브러리 로드, hook, shared_preload_libraries, 업그레이드까지https://jinlog.dev/posts/hello/Wed, 23 Sep 2026 00:00:00 +0000https://jinlog.dev/posts/hello/PostgreSQL 인터널과 MongoDB 인터널, 두 연재를 소개합니다https://jinlog.dev/privacy/Mon, 01 Jan 0001 00:00:00 +0000https://jinlog.dev/privacy/<p>Jin&rsquo;s 블로그(이하 &ldquo;이 블로그&rdquo;, <code>https://jinlog.dev</code>)는 방문자의 개인정보를 소중히 여기며, 어떤 정보가 어디서 처리되는지 아래와 같이 알려 드립니다.</p>https://jinlog.dev/about/Mon, 01 Jan 0001 00:00:00 +0000https://jinlog.dev/about/<p>PostgreSQL과 MongoDB를 운영하는 DBA입니다.</p> <p>이 블로그에서는 데이터베이스가 내부에서 어떻게 동작하는지, 그리고 그 구조가 실제 운영에서 어떤 현상으로 나타나는지를 기록합니다.</p>