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


Alexander Gorbachev



What are the differencies between "create ... table as select" and
"create table" + "insert /*+ parallel(...) append(...) */ into" from
performance point of view?
I am interested in various tables:
- non-partitioned
- partitioned
- non pratitioned IOT
- partitioned IOT

Currently, I use create + insert with parallel append hints. It works
reasonable fast for us - we are able to fill 100+ Gb of data within
1,5 hour.
However, inserting in partitioned IOT's is quite different. There are
few problems:
- slow
- append doesn't work (and, consequently, parallel).
- lot's of redo (coz no append).
- lot's of undo (I guess because no append as well, since with append
you need only revert HWM) and, consequently, ora-1555.
- lot's of temporary space required.

We are able to overcome some problems iterating through each
partition, but it's not a clean solution and performance is still far
from what we target.

I want to change INSERT to CTAS, but it requires some efforts to amend
the script. I assume that CTAS would be more performant for IOT since
it will create index as temporary segment in table's tablespace and
then just amend dictionary (object definition + hwm). So I expect to
eleminate UNDO generation, reduce temporary space requirements, reduce
redo, and.... well, boost performance.

Any comments/links are appreciated.

It's on 64 bit HP-UX.

Thanks in advance.

Best regards,
Alex Gorbachev