Home
All Oracle Error Codes
Oracle DBA Forum

Frequent Oracle Errors

TNS:could not resolve the connect identifier specified
Backtrace message unwound by exceptions
invalid identifier
PL/SQL compilation error
internal error
missing expression
table or view does not exist
end-of-file on communication channel
TNS:listener unknown in connect descriptor
insufficient privileges
PL/SQL: numeric or value error string
TNS:protocol adapter error
ORACLE not available
target host or object does not exist
invalid number
unable to allocate string bytes of shared memory
resource busy and acquire with NOWAIT specified
error occurred at recursive SQL level string
ORACLE initialization or shutdown in progress
archiver error. Connect internal only, until freed
snapshot too old
unable to extend temp segment by string in tablespace
Credential retrieval failed
missing or invalid option
invalid username/password; logon denied
unable to create INITIAL extent for segment
out of process memory when trying to allocate string bytes
shared memory realm does not exist
cannot insert NULL
TNS:unable to connect to destination
remote database not found ora-02019
exception encountered: core dump
inconsistent datatypes
no data found
TNS:operation timed out
PL/SQL: could not find program
existing state of packages has been discarded
maximum number of processes exceeded
error signaled in parallel query server
ORACLE instance terminated. Disconnection forced
TNS:packet writer failure
see ORA-12699
missing right parenthesis
name is already used by an existing object
cannot identify/lock data file
invalid file operation
quoted string not properly terminated

AW: Re: Re: [suse-oracle] When should a VIP address move to other node?

Clemens Bleile

2006-02-10

Replies:

Hi Alexei,

I think there is a misunderstanding here. A service shouldn't depend on a failed-over VIP.

Let's take an example of a 2-node RAC:

A node crashes and the VIP starts on the other node. CRS activates the services on the other node as well, but it registers them under the listener of the local VIP (ie the VIP of the surviving node). If a client connects to the VIP of the failed node it gets an error back immediately (ORA-12541 no listener) and tries to connect to the next VIP in the address-list of your tnsnames.ora and succeeds to connect. I.e. a VIP running on a different node than it should returns an error. The important thing is that it returns the error immediately and the client can handle it immediately (e.g. with TAF).

If the second node comes back then services remain on the node which didn't crash (if you have configured the service "Preferred/Available"). When the VIP switches back you may have a short "unavailability" to connect to the service (only to connect, not already "connected" sessions). On my Laptop with vmware this was 12 seconds. In a real environment probably less. After the failed node finished to boot I relocated the services back. This was another "unavailability" of service of 1 second. I started a test on my Laptop with 1 node up and running. To bring the service on the "down node" up again resulted in an unavailability of service of 13 seconds to connect to the service.

Could you please explain where your long wait times come from?

My understanding is that VIPs are there only for NIC-failures (i.e. a node crash means also a NIC failure ;-)). If a NIC failes then the VIP starts on another node and returns errors immediately when trying to connect to Oracle using this VIP.

Ciao

Clemens



--
To unsubscribe, email: suse-oracle-unsubscribe@(protected)
For additional commands, email: suse-oracle-help@(protected)
Please see http://www.suse.com/oracle/ before posting