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# LSM-Tree Speicher-Engine
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Die primäre Speicher-Engine in BaraDB mit Log-Structured Merge-Tree Architektur.
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## Architektur
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```
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┌─────────────────────────────────────────────┐
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│ Writes │
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│ (append to WAL + MemTable) │
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└─────────────────────────────────────────────┘
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│
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▼
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┌─────────────────────────────────────────────┐
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│ MemTable │
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│ (in-memory sorted buffer) │
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└─────────────────────────────────────────────┘
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│
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(when full, flush to SSTable)
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│
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▼
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┌─────────────────────────────────────────────┐
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│ SSTable │
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│ (sorted string table on disk) │
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└─────────────────────────────────────────────┘
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```
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## Verwendung
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```nim
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import barabadb/storage/lsm
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var db = newLSMTree("./data")
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# Schreiben
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db.put("key1", cast[seq[byte]]("value1"))
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# Lesen
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let (found, value) = db.get("key1")
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# Löschen
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db.delete("key1")
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db.close()
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```
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## Funktionen
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- **Write-optimiert**: Append-only Log-Struktur
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- **Dauerhaftigkeit**: Write-Ahead Log (WAL) sichert Crash-Wiederherstellung
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- **Bloom-Filter**: Schnelle negative Lookups
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- **Compaction**: Size-tiered Strategie mischt SSTables
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- **Page-Cache**: LRU-Cache für häufig zugegriffene Seiten
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## Konfiguration
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```nim
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var db = newLSMTree(
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path = "./data",
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memTableSize = 64 * 1024 * 1024, # 64MB
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walEnabled = true,
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bloomFpRate = 0.01
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)
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```
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