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docs/LevelDB/05_writebatch.md
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layout: default
title: "WriteBatch"
parent: "LevelDB"
nav_order: 5
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# Chapter 5: WriteBatch - Grouping Changes Together
Welcome back! In [Chapter 4: DBImpl](04_dbimpl.md), we saw how `DBImpl` acts as the general manager, coordinating writes, reads, and background tasks. We learned that when you call `Put` or `Delete`, `DBImpl` handles writing to the [Write-Ahead Log (WAL)](03_write_ahead_log__wal____logwriter_logreader.md) and then updating the [MemTable](02_memtable.md).