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# Write-Ahead Log (WAL)
![Chapter Overview](./lsm-tutorial/week2-06-overview.svg)
In this chapter, you will:
* Implement encoding and decoding of the write-ahead log file.
* Recover memtables from the WALs when the system restarts.
## Test Your Understanding
* When can you tell the user that their modifications (put/delete) have been persisted?
We do not provide reference answers to the questions, and feel free to discuss about them in the Discord community.
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