All Oracle Error Codes
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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

listener.ora search order

Charu Joshi



This is not a critical issue, but important for my understanding.

Multiple Homes: ora_8i_home (d:\ora8i), ora_9i_home(d:\ora9i), and
2 others..
Selected Home: ora_8i_home
TNS_ADMIN environment variable: d:\ora9i\network\admin

1.When I run 'lsnrctl start' command, it reads the
d:\ora8i\network\admin\listener.ora file.

2.If I remove this file and run 'lsnrtctl start', it reads the
'd:\ora9i\network\admin\listerner.ora' file.

In both the above cases, the TNSNames.ora files is read from the
%TNS_ADMIN% location, but evidently not listerner.ora. Why? It
seems that lsnrctl is searching in each Oracle Home for
listerner.ora (as per registry order) and uses the first one that
it finds.

There used to be a 7.3.4 client installation on my machine, which
I removed as per metalink note 73963.1, so that there is no
DEFAULT_HOME at present. After this, I found that another home
DEFAULT_HOME1 was automatically added to registry with the same
path as that of the earlier DEFAULT_HOME. Could this have
something to do with the anamoly?

Any ideas/suggestion please?

Thanks and regards,

PS: Can we not specify the path of listener.ora explicitly while
running lsnrctl?


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