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# troubleshooting
s
Slackbot
05/02/2023, 6:57 AM
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g
Gian Merlino
05/02/2023, 7:04 AM
some generic performance advice: 1) consider schema design best practices—
https://druid.apache.org/docs/latest/ingestion/schema-design.html#general-tips-and-best-practices
2) try adding more data servers and see if that helps. if it does then it means your bottleneck is dat servers. if it doesn't, then your bottleneck is likely at the Broker 3) try to attack the bottleneck by looking at HW metrics: for example, if you are I/O bound then try adding memory or try looking into the performance of your I/O layer 4) also consider grabbing a flame graph to understand the bottleneck further (
https://support.imply.io/hc/en-us/articles/360033747953-Profiling-Druid-queries-using-flame-graphs
)
b
Bharat Kumar Singh
05/02/2023, 7:05 AM
Thanks
@Gian Merlino
will go through these docs.
j
Jordi Escrich
05/02/2023, 8:34 AM
hi
@Bharat Kumar Singh
! also, be mindful of how you are usually accessing the data and how it's physically stored in the segments; I was using a specific dimension for filtering 100% of the time, so using
single_dim
as
partitioning
helped a ton
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