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

Re: SQL Tunning

Wes Brooks


Hello expert,

Thank you very much for all of your reply.

But in my case, the 1 is variable. I tried the following but it complains that

SELECT TRUNC(SYSDATE)-22/86400 from dual;

02-AUG-04 <--- Wrong date.

SELECT TRUNC(SYSDATE-22)/86400 from dual;
SELECT (TRUNC(SYSDATE)-22)/86400 from dual;

These two SQL statements gave the error:

ORA-00932: inconsistent datatypes

If I try this one, it works.

'DD-MON-YYYY HH24:MI:SS') from dual;

Is there any way to improve this lengthly statement?


--- Edgar Chupit <edgar.chupit@(protected):

> Hello Wes,
> WB>   WHERE TRUNC(last_update_date) = TRUNC(SYSDATE - 1)
> WB> How to improve the performance? Do I need to create a new index field on the table with
> TRUNC(last_update_date)?
> You have several opportunities:
> a) you can rewrite your query to this:
>     where last_update_date between trunc(sysdate)-1 and trunc(sysdate)-1/86400
> b) you can create function based index like:
>     create index tt_idx on tt(trunc(last_update_date));
> c) you can add column to your table with values from trunc(last_update_date)
> What option to choose mostly depends on your requirements.

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