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> **Documentation Index:** Fetch the complete configuration index at https://ydb.tech/docs/en/llms.txt

# Videos 2022

## Parallel asynchronous replication between YDB database instances {#2022-conf-hydra-parallel-async-rep}

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 <span class = "database_internals-tag tags-shape tags-color-text"> Database internals</span>
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In this talk, we present an approach to asynchronous replication in YDB that provides the following characteristics: changefeed from the source database is sharded among multiple persistent queues, sharded changefeed is applied to the target database in a manner that guarantees the target database consistency.

@[YouTube](https://www.youtube.com/watch?v=Ga2Eg2rbPPc)

[Slides](https://presentations.ydb.tech/2022/en/hydra/presentation.pdf)

## Scalability and Fault Tolerance in YDB {#2022-webinar-scalability}

In this talk, we will cover two layers of YDB: Tablet and BlobStorage, which together provide fault tolerance, scalability, and user isolation.

@[YouTube](https://www.youtube.com/watch?v=eYpyKXihGaY)