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docs/LevelDB/07_iterator.md
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layout: default
title: "Iterator"
parent: "LevelDB"
nav_order: 7
---
# Chapter 7: Iterator - Your Guide Through the Database
Welcome back! In [Chapter 6: Version & VersionSet](06_version___versionset.md), we learned how LevelDB keeps track of all the live SSTable files using `Version` objects and the `VersionSet`. This catalog helps LevelDB efficiently find a single key by looking first in the [MemTable](02_memtable.md) and then pinpointing the right [SSTables](01_table___sstable___tablecache.md) to check.