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

Re: Table Joins

Jared Still


As others have said, you need proof.

I can hazard a guess as to the origins of this myth.

Sometimes the natural key to a table is composite, that is
1+ columns make of the primary key.

In that case, a number single column key will likely prove
faster, simply because there are fewer comparisons to make.

Though I don't know how much faster that might be.  It may
be too small to measure without a large result set to test.

As an aside, Oracle recommends using SYS_GUID to generate
primary keys. Try this and see what data type you get:

 SQL>  select sys_guid() from dual;

Try using the dump() function, and look up the datatype code in
the datatypes section of the SQL manual.

Or just look at the docs for SYS_GUID.


On 5/24/06, genegurevich@discoverfinancial.com <genegurevich@discoverfinancial.com> wrote:
Hi all:

One of my developers insists that joins by numerical fields result in
better preformance than the joins by
character fields. I don't remember reading much on this point. Is there any
truth in it?

thank you

Gene Gurevich


Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist