# Some newbie questions

**URL:** <https://forums.percona.com/t/some-newbie-questions/19611>\
**Category:** Percona XtraDB Cluster\
**Created:** [January 13, 2023, 1:14pm UTC](https://forums.percona.com/t/some-newbie-questions/19611 "2023-01-13T13:14:59Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Deniska80](https://avatars.discourse-cdn.com/v4/letter/d/db5fbb/32.png) [@Deniska80](https://forums.percona.com/u/Deniska80)\
**Post date:** [January 13, 2023, 1:14pm UTC](https://forums.percona.com/t/some-newbie-questions/19611/1 "2023-01-13T13:14:59Z")

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Hello, we have now percona mysql production and pair of read only slaves in GTID replcation. Can you explain, please (or give some links, where i could read it), if we swich to XtraDBCluster, what happend with time of write queries? Am i right thinking, that these queries will be slower? Due to nature of cluster.

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**Author:** ![Evgeniy\_Patlan](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/evgeniy_patlan/32/41_2.png) [@Evgeniy\_Patlan](https://forums.percona.com/u/Evgeniy_Patlan)\
**Post date:** [January 13, 2023, 2:00pm UTC](https://forums.percona.com/t/some-newbie-questions/19611/2 "2023-01-13T14:00:18Z")

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Hi @Deniska80  
You can find all needed documentation here: [About Percona XtraDB Cluster - Percona XtraDB Cluster](https://docs.percona.com/percona-xtradb-cluster/8.0/intro.html)

Write throughput of the whole cluster is limited by the weakest node.  
If one node becomes slow, the whole cluster slows down. If you have requirements for stable high performance, then it should be supported by corresponding hardware.

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**Author:** ![Deniska80](https://avatars.discourse-cdn.com/v4/letter/d/db5fbb/32.png) [@Deniska80](https://forums.percona.com/u/Deniska80)\
**Post date:** [January 13, 2023, 2:05pm UTC](https://forums.percona.com/t/some-newbie-questions/19611/3 "2023-01-13T14:05:57Z")

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Thanks for link

> [@Evgeniy\_Patlan](#):
>
> it should be supported by corresponding hardware.

Of course. I mean, that, for example, that write time for 3 identical nodes cluster will be slower, that if it be just single server with identical hardware

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**Author:** ![matthewb](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/matthewb/32/34_2.png) [@matthewb](https://forums.percona.com/u/matthewb)\
**Post date:** [January 16, 2023, 1:20am UTC](https://forums.percona.com/t/some-newbie-questions/19611/4 "2023-01-16T01:20:05Z")

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@Deniska80 Only replication of the write events in PXC is synchronous. Apply is async. If all 3 nodes are on the same LAN and of equal specifications, on average, you shouldn’t notice much change in write throughput. Replication/communication in PXC uses a completely different protocol compared to traditional replication.