Many unauthenticated user, writing to net after using show processlist command

Many unauthenticated user, writing to net after using show processlist command

by Đặng Quang Hùng -
Number of replies: 6
Hi all,

I've got many unauthenticated user, writing to net, reading from net, ... when use "show processlist" command in myslql. It makes database server be full of processes and moodle's performance is so slow.

I've tried scp command to test data transfer speed between webserver and database server. The result that:
- It's very slow if mysql still running in db server (about 500KB/s).
- It's very fast if I stop mysql in db server (about 40MB/s)

What happen? Who can help me to solve that problem.

Thanks.
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In reply to Đặng Quang Hùng

Re: Many unauthenticated user, writing to net after using show processlist command

by Jai Gupta -
Few things you could check.
  1. LAN speed between servers (should be 1Gbps).
  2. Is mysql connection slow? (this could be because of DNS)
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In reply to Jai Gupta

Re: Many unauthenticated user, writing to net after using show processlist command

by Đặng Quang Hùng -
Yes, Lan speed is 1GBps and I'm using ip for connection. Any ideas?
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In reply to Đặng Quang Hùng

Re: Many unauthenticated user, writing to net after using show processlist command

by Jai Gupta -
This is the first time for me when network connection (with 1GBps LAN) has become a bottleneck for database.

Have you tried installing Memcached on webserver? This may reduce network bandwidth.
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In reply to Jai Gupta

Re: Many unauthenticated user, writing to net after using show processlist command

by Đặng Quang Hùng -
Thanks for your suggestion. Actually, I've not tried it yet. Plz guide me more in detail.

Thanks a lot.
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In reply to Đặng Quang Hùng

Re: Many unauthenticated user, writing to net after using show processlist command

by Jai Gupta -
http://en.wikipedia.org/wiki/Memcached

Memcached is basically a caching system for database. If you install it on webserver then it may cache a reasonable amount of data in webserver, reducing the calls to db server hence reducing bandwidth.

You can download it from http://www.danga.com/memcached/download.bml
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