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тАО03-01-2002 12:28 PM
тАО03-01-2002 12:28 PM
oracle name server
We are experiencing slow performance when we start the Oracle Name server on our primary server. It takes as long as 15-20 minutes to start. Also, registering new databases usually just times out. All other network components seem to be working ok. No other performance issues have been reported. Any insight on this?
Thanks
Thanks
When the only tool you own is a hammer, every problem looks like a nail!
3 REPLIES 3
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тАО03-01-2002 01:09 PM
тАО03-01-2002 01:09 PM
Re: oracle name server
Roger,
Are you using DNS? What are the contents of /etc/resolv.conf and /etc/nsswitch.conf?
live free or die
harry
Are you using DNS? What are the contents of /etc/resolv.conf and /etc/nsswitch.conf?
live free or die
harry
Live Free or Die
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тАО03-01-2002 05:44 PM
тАО03-01-2002 05:44 PM
Re: oracle name server
Very common problem with the DNS server. To prove this, place the important IP addresses and hostnames in /etc/hosts and rename the resolv.conf file to something like resolv.conf.old. Now try your system...it should respond normally.
What is happening is that all socket requests (telnet, rlogin, SQLnet, etc) are asking the DNS server for IP and hostname information and when it refuses to respond or is overloaded, your local server will be appear to be almost crippled as each network task will take 20 seconds or so to timeout.
A problem DNS server will do bad things to an entire network so for reliability, create nsswitch.conf, and use files then dns, and put the important addresses in /etc/hosts.
Bill Hassell, sysadmin
What is happening is that all socket requests (telnet, rlogin, SQLnet, etc) are asking the DNS server for IP and hostname information and when it refuses to respond or is overloaded, your local server will be appear to be almost crippled as each network task will take 20 seconds or so to timeout.
A problem DNS server will do bad things to an entire network so for reliability, create nsswitch.conf, and use files then dns, and put the important addresses in /etc/hosts.
Bill Hassell, sysadmin
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тАО03-01-2002 06:14 PM
тАО03-01-2002 06:14 PM
Re: oracle name server
I agree with Bill except for relying on /etc/hosts.
Becomes an admin headache in large environments.
You should hound the DNS dudes to have no fewer than 2 servers - 3 is even better, PROPERLY config & monitor/maintain them. Then set the search order to go thru all of them before hitting the hosts file.
/etc/hosts should be the resolver of absolutely LAST resort.
Becomes an admin headache in large environments.
You should hound the DNS dudes to have no fewer than 2 servers - 3 is even better, PROPERLY config & monitor/maintain them. Then set the search order to go thru all of them before hitting the hosts file.
/etc/hosts should be the resolver of absolutely LAST resort.
PERSEVERANCE -- Remember, whatever does not kill you only makes you stronger!
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