how to prove network is slow

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how to prove network is slow

vsamantha35

SSChampion

Points: 11529
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November 23, 2015 at 12:05 pm

#302452

Hi All,
Is there any easy way / dirty test to determine/prove my network is slow without baseline info?
Thanks in advance.
-Sam

Viewing 7 posts - 1 through 6 (of 6 total)

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Lowell SSC Guru Points: 323504 More actions · Answer 1

In my experience, the network low on my list of things to review for slow running queries.

returning trivial information, like SELECT @@VERSION should come back instantly. that would quickly show network performance as a baseline, vs other queries that run slower.

much more likely, you want to look at the top slowest performing queries, missing indexes, etc as your first review for performance.

Glenn Berry's website[/url] has some nice scripts to use as a jumping off point.

i'd also get Brent Ozar's SQL Blitz[/url] scripts to review the easy, low hanging fruit if you've been droppe dintot eh accidental DBA role.

Lowell

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Jack Corbett SSC Guru Points: 184393 More actions · Answer 2

You can use perfmon counters to show what the network card(s) are handling. Like Current Bandwidth, Bytes Total/Sec, Output Queue Length, And Packets/Sec.

I've also just used Task Manager, which has shown that the network was misconfigured somewhere because a gigabit interface was running at 10MB.

Jack Corbett
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benjamin.reyes SSCertifiable Points: 5249 More actions · Answer 3

Depends on your environment. One easy way that works most places is Iperf.

https://github.com/esnet/iperf

Sergiy SSC Guru Points: 110206 More actions · Answer 4

Load a file to a table:

1. From a local folder (local to the server)

2. From a network location.

_____________
Code for TallyGenerator

benjamin.reyes SSCertifiable Points: 5249 More actions · Answer 5

Sergiy (11/23/2015)
Load a file to a table:
1. From a local folder (local to the server)
2. From a network location.

You could do the same with using robocopy which gives nice readouts of data transfer speeds, but by copying files rather than testing the tcp packets directly you introduce the possibility of confusing a potential network issue with disk issues.

Alternatively you could probably use something like wireshark, or if you have the money there are lots of vendors such as solarwinds, new relic ect that track network performance.

vsamantha35 SSChampion Points: 11529 More actions · Answer 6

Awesome. Thank you all for sharing thoughts. Will try 1 by1.