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

Self-Healing ORA-01578's

Singer, Phillip (P.W.)


This actually happened to me Saturday Night:

Running my 4-way Linux box (4.21 Kernel) with 9.2.0 (and
using a SAN for my disks) I discovered a ORA-01578. After
several hours of work with Oracle support, running dbverify,
and creating test queries, we determined that there really
was block corruption.

We used dbms_repair to get everything but the bad block,
and were getting ready to see what would happen on a
tablespace recovery, when the backup group decided to
stop the instance to do a cold backup (I work for a large
organization, with every task subdivided, with little

When the instance came back up the block corruption was
gone. This is the one part of the whole affair that I find
incredible. Does someone have an idea as to how bouncing
an instance can fix block corruption which was proven by
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