dimgigov
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Documentation updates: - Fix v0.1.0 → v1.1.0 version numbers in en, ru, fa, zh docs - Add missing Window Functions, Multi-Tenant ERP, Supported Keywords sections to ru, fa, zh baraql.md (~105 lines each) - Expand Turkish and Arabic baraql.md (110 → 268 lines) - Expand Turkish and Arabic installation.md (62 → 307 lines) - Add new Bulgarian documentation files (18 new files) Client updates: - Python: Full async/await rewrite with asyncio, request queueing - Rust: Full async/await rewrite with tokio, async examples - Nim: Update README to v1.1.0 - All clients now support async patterns consistently
2.4 KiB
2.4 KiB
LSM-Tree Storage Engine
Основният storage engine в BaraDB, използващ Log-Structured Merge-Tree архитектура.
Архитектура
┌─────────────────────────────────────────────┐
│ Записи │
│ (добавяне към WAL + MemTable) │
└─────────────────────────────────────────────┘
│
▼
┌─────────────────────────────────────────────┐
│ MemTable │
│ (в-памет сортиран буфер) │
└─────────────────────────────────────────────┘
│
(при запълване, flush към SSTable)
│
▼
┌─────────────────────────────────────────────┐
│ SSTable │
│ (сортирана string table на диска) │
└─────────────────────────────────────────────┘
Употреба
import barabadb/storage/lsm
var db = newLSMTree("./data")
# Запис
db.put("key1", cast[seq[byte]]("value1"))
# Четене
let (found, value) = db.get("key1")
# Изтриване
db.delete("key1")
db.close()
Възможности
- Write-оптимизиран: Append-only лог структура
- Устойчивост: Write-ahead log (WAL) осигурява crash recovery
- Bloom Филтър: Бързи негативни проверки
- Compaction: Size-tiered стратегия слива SSTables
- Page Cache: LRU кеш за често достъпвани страници
Конфигурация
var db = newLSMTree(
path = "./data",
memTableSize = 64 * 1024 * 1024, # 64MB
walEnabled = true,
bloomFpRate = 0.01
)