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

Rookie Error?

Jared Still


Ok, I'm probably missing something obvious.


Server 1:
RedHat 9.0
2.4.20-8 kernel

Server 2:
White Box 3.0 Respin 1
2.4.21-15.EL kernel

I can succussfully ssh between each box

I can successfuly tnsping and connect via sqlnet from server 2
to server 1.

I *cannot* successfully tnsping and connect via sqlnet from
server 1 to server 2.

The consistent error is tns-12541 ( no listener )

Setting up the listener on server 2 so that local connections
will use TCP allows a connection:

------ local connect via TCP

TNS Ping Utility for Linux: Version - Production on
27-NOV-2004 23:03:28

Copyright (c) 1997, 2003, Oracle. All rights reserved.

Used parameter files:

Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS =
(PROTOCOL = TCP)(HOST = sherlock)(PORT = 1522))) (CONNECT_DATA =
OK (10 msec)

SQL*Plus: Release - Production on Sat Nov 27 23:03:34 2004

Copyright (c) 1982, 2004, Oracle. All rights reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release - Production
With the Partitioning, OLAP and Data Mining options


Any attempt to do this from server 1 will result in an ora-12541.

I've double checked the port assignments (1522), etc.

Even using a literal connect string of:

TCP)(HOST = sherlock)(PORT = 1522))) (CONNECT_DATA = (SERVER =
(SERVICE_NAME = ts11)))"

... works from server 2

but not from server 1.

Using strace -aef on the listener shows absolutely no activity when
a remote connection is attempted, as if server 2 were rejecting all
packets to port 1522 ( or either of 1521 and 20000, which I also tested)

The firewall is off.

Firewall is stopped.
Firewall is stopped.

Any ideas?


Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist