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docs/LevelDB/06_version___versionset.md
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---
layout: default
title: "Version & VersionSet"
parent: "LevelDB"
nav_order: 6
---
# Chapter 6: Version & VersionSet - The Database Catalog
In the previous chapter, [Chapter 5: WriteBatch](05_writebatch.md), we learned how LevelDB groups multiple `Put` and `Delete` operations together to apply them atomically and efficiently. We saw that writes go first to the [Write-Ahead Log (WAL)](03_write_ahead_log__wal____logwriter_logreader.md) for durability, and then to the in-memory [MemTable](02_memtable.md).